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122-693: The Rhine flowed in a large meander ( Schleife or Schlinge ) enclosing the Kühkopf  [ de ] . Until the beginning of the 17th century, the Kühkopf was a hunting area for noble families, also for farming from single estates ( Hofgüter ). On 7 december 1631, Gustavus Adolphus of Sweden and his army crossed the Rhine during the Thirty Years' War , memorialized by the Schwedensäule  [ de ] monument in

244-809: A Greek victory in 449 BCE, and the Ionian cities regained their independence. By the Peace of Antalcidas (387 BCE), which ended the Corinthian War , Persia regained control over Ionia. In 334 BCE, the Macedonian Greek king Alexander the Great conquered the Anatolian peninsula from the Achaemenid Persian Empire. Alexander's conquest opened up the interior of Asia Minor to Greek settlement and influence. Following

366-462: A bitter series of civil wars followed by a combined attack by Medes , Persians , Scythians and their own Babylonian relations. The last Assyrian city to fall was Harran in southeast Anatolia. This city was the birthplace of the last king of Babylon , the Assyrian Nabonidus and his son and regent Belshazzar . Much of the region then fell to the short-lived Iran-based Median Empire , with

488-452: A maximum at the apex to zero at a crossing point (straight line), also called an inflection, because the curvature changes direction in that vicinity. The radius of the loop is the straight line perpendicular to the down-valley axis intersecting the sinuous axis at the apex. As the loop is not ideal, additional information is needed to characterize it. The orientation angle is the angle between sinuous axis and down-valley axis at any point on

610-405: A meander because helicoidal flow of water keeps the bank washed clean of loose sand, silt, and sediment and subjects it to constant erosion. As a result, the meander erodes and migrates in the direction of the outside bend, forming the cut bank. As the cut bank is undermined by erosion, it commonly collapses as slumps into the river channel. The slumped sediment, having been broken up by slumping,

732-411: A meander is part of an entrenched river or part of a freely meandering river within a floodplain, the term slip-off slope can refer to two different fluvial landforms that comprise the inner, convex, bank of a meander loop. In case of a freely meandering river on a floodplain, a slip-off slope is the inside, gently sloping bank of a meander on which sediments episodically accumulate to form a point bar as

854-431: A meandering watercourse is termed meander geometry or meander planform geometry. It is characterized as an irregular waveform . Ideal waveforms, such as a sine wave , are one line thick, but in the case of a stream the width must be taken into consideration. The bankfull width is the distance across the bed at an average cross-section at the full-stream level, typically estimated by the line of lowest vegetation. As

976-419: A non-mathematical utility as well. Streams can be placed in categories arranged by it; for example, when the index is between 1 and 1.5 the river is sinuous, but if between 1.5 and 4, then meandering. The index is a measure also of stream velocity and sediment load, those quantities being maximized at an index of 1 (straight). Asia-Minor Anatolia ( Turkish : Anadolu ), also known as Asia Minor ,

1098-428: A river meanders. This type of slip-off slope is located opposite the cutbank. This term can also be applied to the inside, sloping bank of a meandering tidal channel. In case of an entrenched river, a slip-off slope is a gently sloping bedrock surface that rises from the inside, concave bank of an asymmetrically entrenched river. This type of slip-off slope is often covered by a thin, discontinuous layer of alluvium. It

1220-413: A self-intensifying process...in which greater curvature results in more erosion of the bank, which results in greater curvature..." The cross-current along the floor of the channel is part of the secondary flow and sweeps dense eroded material towards the inside of the bend. The cross-current then rises to the surface near the inside and flows towards the outside, forming the helical flow . The greater

1342-419: A series of regular sinuous curves in the channel of a river or other watercourse . It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank or river cliff ) and deposits sediments on an inner, convex bank which is typically a point bar . The result of this coupled erosion and sedimentation is the formation of a sinuous course as the channel migrates back and forth across

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1464-647: A sizeable Armenian population before the Armenian genocide ) an "ahistorical imposition" and notes that a growing body of literature is uncomfortable with referring to the Ottoman East as "Eastern Anatolia". The highest mountain in the Eastern Anatolia Region (also the highest peak in the Armenian Highlands ) is Mount Ararat (5123 m). The Euphrates , Aras , Karasu and Murat rivers connect

1586-434: A symmetrical valley sides. He argues that the symmetrical valley sides are the direct result of rapid down-cutting of a watercourse into bedrock. In addition, as proposed by Rich, Thornbury argues that incised valleys with a pronounced asymmetry of cross section, which he called ingrown meanders , are the result of the lateral migration and incision of a meander during a period of slower channel downcutting . Regardless,

1708-413: A waveform the meandering stream follows the down-valley axis, a straight line fitted to the curve such that the sum of all the amplitudes measured from it is zero. This axis represents the overall direction of the stream. At any cross-section the flow is following the sinuous axis, the centerline of the bed. Two consecutive crossing points of sinuous and down-valley axes define a meander loop. The meander

1830-700: Is a peninsula in West Asia that makes up the majority of the land area of Turkey . It is the westernmost protrusion of Asia and is geographically bounded by the Mediterranean Sea to the south, the Aegean Sea to the west, the Turkish Straits to the northwest, and the Black Sea to the north. The eastern and southeastern limits have been expanded either to the entirety of Asiatic Turkey or to an imprecise line from

1952-419: Is called lateral accretion. Lateral accretion occurs mostly during high water or floods when the point bar is submerged. Typically, the sediment consists of either sand, gravel, or a combination of both. The sediment comprising some point bars might grade downstream into silty sediments. Because of the decreasing velocity and strength of current from the thalweg of the channel to the upper surface of point bar when

2074-565: Is not well understood how the Osmanlı, or Ottoman Turks , came to dominate their neighbours, as the history of medieval Anatolia is still little known. The Ottomans completed the conquest of the peninsula in 1517 with the taking of Halicarnassus (modern Bodrum ) from the Knights of Saint John . With the acceleration of the decline of the Ottoman Empire in the early 19th century, and as a result of

2196-776: Is now a Europareservat, protected since 2008 by the Habitats Directive of the European Union . The protected area contains riparian forests ( Auwald or Aue ), both Weichholzaue  [ de ] with typical Kopfweide  [ de ] and black poplar , and bottomland hardwood forest with oak, elm and aspen. The Kühkopf area has a long tradition of orchards . In 1960, 3531 apple trees, 61 pear trees, 130 plum trees, 36 walnut trees and five mirabelle plum trees were counted, planted as Streuobst (orchard). The protected area has more than 2000 fruit trees, including more than 30 kinds of apples. The extended swamps of

2318-661: Is probably a Medieval Latin innovation. The modern Turkish form Anadolu derives directly from the Greek name Aνατολή ( Anatolḗ ). The Russian male name Anatoly , the French Anatole and plain Anatol , all stemming from saints Anatolius of Laodicea (d. 283) and Anatolius of Constantinople (d. 458; the first Patriarch of Constantinople ), share the same linguistic origin. The oldest known name for any region within Anatolia

2440-424: Is produced by the gradual outward migration of the meander as a river cuts downward into bedrock. A terrace on the slip-off slope of a meander spur, known as slip-off slope terrace , can be formed by a brief halt during the irregular incision by an actively meandering river. The meander ratio or sinuosity index is a means of quantifying how much a river or stream meanders (how much its course deviates from

2562-458: Is readily eroded and carried toward the middle of the channel. The sediment eroded from a cut bank tends to be deposited on the point bar of the next downstream meander, and not on the point bar opposite it. This can be seen in areas where trees grow on the banks of rivers; on the inside of meanders, trees, such as willows, are often far from the bank, whilst on the outside of the bend, the tree roots are often exposed and undercut, eventually leading

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2684-467: Is related to its central area, known as the "Land of Hatti " – a designation that was initially used for the land of ancient Hattians , but later became the most common name for the entire territory under the rule of ancient Hittites . The first recorded name the Greeks used for the Anatolian peninsula, though not particularly popular at the time, was Ἀσία ( Asía ), perhaps from an Akkadian expression for

2806-520: Is so exceedingly winding that everything winding is called meandering.’ The Meander River is south of Izmir, east of the ancient Greek town of Miletus , now Milet, Turkey. It flows through series of three graben in the Menderes Massif, but has a flood plain much wider than the meander zone in its lower reach. Its modern Turkish name is the Büyük Menderes River . Meanders are a result of

2928-478: Is the length along the centerline. Once a channel begins to follow a sinusoidal path, the amplitude and concavity of the loops increase dramatically. This is due to the effect of helical flow which sweeps dense eroded material towards the inside of the bend, and leaves the outside of the bend unprotected and vulnerable to accelerated erosion. This establishes a positive feedback loop . In the words of Elizabeth A. Wood: "...this process of making meanders seems to be

3050-405: Is the most common type of fluvial lake, is a crescent-shaped lake that derives its name from its distinctive curved shape. Oxbow lakes are also known as cutoff lakes . Such lakes form regularly in undisturbed floodplains as a result of the normal process of fluvial meandering. Either a river or stream forms a sinuous channel as the outer side of its bends are eroded away and sediments accumulate on

3172-430: Is two consecutive loops pointing in opposite transverse directions. The distance of one meander along the down-valley axis is the meander length or wavelength . The maximum distance from the down-valley axis to the sinuous axis of a loop is the meander width or amplitude . The course at that point is the apex. In contrast to sine waves, the loops of a meandering stream are more nearly circular. The curvature varies from

3294-685: The Aeolian , Ionian and Dorian colonies situated along the eastern coasts of the Aegean Sea , but also encompassing eastern regions in general. Such use of Anatolian designations was employed during the reign of Roman Emperor Diocletian ( r.  284–305 ), who created the Diocese of the East , known in Greek as the Eastern Diocese, but completely unrelated to the regions of Asia Minor. In their widest territorial scope, Anatolian designations were employed during

3416-637: The Anatolian languages , the earliest attested branch of Indo-European, have been spoken in Anatolia since at least the 19th century BCE. The earliest historical data related to Anatolia appear during the Bronze Age and continue throughout the Iron Age . The most ancient period in the history of Anatolia spans from the emergence of ancient Hattians , up to the conquest of Anatolia by the Achaemenid Empire in

3538-527: The Ancient Greeks as Μαίανδρος Maiandros ( Latin : Maeander ), characterised by a very convoluted path along the lower reach. As a result, even in Classical Greece (and in later Greek thought) the name of the river had become a common noun meaning anything convoluted and winding, such as decorative patterns or speech and ideas, as well as the geomorphological feature. Strabo said: ‘...its course

3660-946: The Arab invasion of the Levant (634–638). In the 10 years following the Battle of Manzikert in 1071, the Seljuk Turks from Central Asia migrated over large areas of Anatolia, with particular concentrations around the northwestern rim. The Turkish language and the Islamic religion were gradually introduced as a result of the Seljuk conquest, and this period marks the start of Anatolia's slow transition from predominantly Christian and Greek-speaking, to predominantly Muslim and Turkish-speaking (although ethnic groups such as Armenians, Greeks, and Assyrians remained numerous and retained Christianity and their native languages). In

3782-620: The Balkans . The Phrygian expansion into southeast Anatolia was eventually halted by the Assyrians, who controlled that region. Another Indo-European people, the Luwians , rose to prominence in central and western Anatolia c.  2000 BCE. Their language belonged to the same linguistic branch as Hittite . The general consensus amongst scholars is that Luwian was spoken across a large area of western Anatolia, including (possibly) Wilusa ( Troy ),

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3904-826: The Black Sea to the Gulf of Alexandretta . Topographically, the Sea of Marmara connects the Black Sea with the Aegean Sea through the Bosporus and the Dardanelles , and separates Anatolia from Thrace in Southeast Europe . During the Neolithic , Anatolia was an early centre for the development of farming after it originated in the adjacent Fertile Crescent . Beginning around 9,000 years ago, there

4026-510: The Black Sea , coterminous with the Anatolian Plateau . This traditional geographical definition is used, for example, in the latest edition of Merriam-Webster's Geographical Dictionary . Under this definition, Anatolia is bounded to the east by the Armenian Highlands , and the Euphrates before that river bends to the southeast to enter Mesopotamia . To the southeast, it is bounded by

4148-463: The Eastern Anatolia Region , which largely corresponds to the historical region of Western Armenia (named as such after the division of Greater Armenia between the Roman / Byzantine Empire (Western Armenia) and Sassanid Persia ( Eastern Armenia ) in 387 AD). Vazken Davidian terms the expanded use of "Anatolia" to apply to territory in eastern Turkey that was formerly referred to as Armenia (which had

4270-732: The Greek and Roman eras. During the 6th century BCE, all of Anatolia was conquered by the Persian Achaemenid Empire , the Persians having usurped the Medes as the dominant dynasty of Persia . In 499 BCE, the Ionian city-states on the west coast of Anatolia rebelled against Persian rule. The Ionian Revolt , as it became known, though quelled, initiated the Greco-Persian Wars , which ended in

4392-648: The Hellenic world . He has been called the greatest ruler of the Kingdom of Pontus. Further annexations by Rome, in particular of the Kingdom of Pontus by Pompey , brought all of Anatolia under Roman control , except for the southeastern frontier with the Parthian Empire , which remained unstable for centuries, causing a series of military conflicts that culminated in the Roman–Parthian Wars (54 BCE – 217 CE). After

4514-511: The Knoblochsaue . In 1828/29, directed by Großherzoglicher Darmstädter Wasserbaudirektor Claus Kröncke  [ de ] , a shortcut of the river ( Rhein-Durchstich ) shortened the passage for ships. The Kühkopf became an island with the new Rhine in the west and the former river bed ( Altrhein ). The former island Knoblochsaue became a peninsula. The ecology of the area is of great importance, and has been protected from 20 March 1952. It

4636-641: The Later Roman Empire . Anatolia's wealth grew during the 4th and 5th centuries thanks, in part, to the Pilgrim's Road that ran through the peninsula. Literary evidence about the rural landscape stems from the Christian hagiographies of the 6th-century Nicholas of Sion and 7th-century Theodore of Sykeon . Large and prosperous urban centers of Byzantine Anatolia included Assos , Ephesus , Miletus , Nicaea , Pergamum , Priene , Sardis , and Aphrodisias . From

4758-476: The Ozark Plateau . As noted above, it was initially either argued or presumed that an incised meander is characteristic of an antecedent stream or river that had incised its channel into underlying strata . An antecedent stream or river is one that maintains its original course and pattern during incision despite the changes in underlying rock topography and rock types. However, later geologists argue that

4880-510: The Paleolithic . Neolithic settlements include Çatalhöyük , Çayönü , Nevali Cori , Aşıklı Höyük , Boncuklu Höyük , Hacilar , Göbekli Tepe , Norşuntepe , Köşk Höyük , and Yumuktepe . Çatalhöyük (7.000 BCE) is considered the most advanced of these. Recent advances in archaeogenetics have confirmed that the spread of agriculture from the Middle East to Europe was strongly correlated with

5002-703: The Roman Republic ; western and central Anatolia came under Roman control , but Hellenistic culture remained predominant. Mithridates VI Eupator , ruler of the Kingdom of Pontus in northern Anatolia, waged war against the Roman Republic in the year 88 BCE in order to halt the advance of Roman hegemony in the Aegean Sea region. Mithridates VI sought to dominate Asia Minor and the Black Sea region, waging several hard-fought but ultimately unsuccessful wars (the Mithridatic Wars ) to break Roman dominion over Asia and

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5124-649: The Vallahades from Greek Macedonia ), were resettled in various parts of Anatolia, mostly in formerly Christian villages throughout Anatolia. A continuous reverse migration occurred since the early 19th century, when Greeks from Anatolia, Constantinople and Pontus area migrated toward the newly independent Kingdom of Greece , and also towards the United States , the southern part of the Russian Empire , Latin America, and

5246-449: The bedrock are known as either incised , intrenched , entrenched , inclosed or ingrown meanders . Some Earth scientists recognize and use a finer subdivision of incised meanders. Thornbury argues that incised or inclosed meanders are synonyms that are appropriate to describe any meander incised downward into bedrock and defines enclosed or entrenched meanders as a subtype of incised meanders (inclosed meanders) characterized by

5368-613: The first division of the Roman Empire , Anatolia became part of the Eastern Roman Empire , otherwise known as the Byzantine Empire or Byzantium . In the 1st century CE, Anatolia became one of the first places where Christianity spread , so that by the 4th century CE, western and central Anatolia were overwhelmingly Christian and Greek-speaking. Byzantine Anatolia was one of the wealthiest and most densely populated places in

5490-399: The floodplains , with grass, reed beds and trees, offer breeding places for many kinds of birds, and resting places for migrating birds. The symbol of the Kühkopf is the black kite . Deer, wild boars, foxes, frogs and toads are common in the protected area. In spring, much of the forest floor is covered by wild garlic . Many trees host mistletoes . Meander A meander is one of

5612-430: The migration of early farmers from Anatolia about 9,000 years ago, and was not just a cultural exchange. Anatolian Neolithic farmers derived most of their ancestry from local Anatolian hunter-gatherers , suggesting that agriculture was adopted in site by these hunter-gatherers and not spread by demic diffusion into the region. Anatolian derived Neolithic Farmers would subsequently spread across Europe, as far west as

5734-622: The "sunrise" or possibly echoing the name of the Assuwa league in western Anatolia. The Romans used it as the name of their province , comprising the west of the peninsula plus the nearby Aegean Islands . As the name "Asia" broadened its scope to apply to the vaster region east of the Mediterranean, some Greeks in Late Antiquity came to use the name Asia Minor (Μικρὰ Ἀσία, Mikrà Asía ), meaning "Lesser Asia" to refer to present-day Anatolia, whereas

5856-495: The 1923 population exchange between Greece and Turkey . Of the remainder, most have left Turkey since then, leaving fewer than 5,000 Greeks in Anatolia today. According to Morris and Ze'evi, 4 million christians were ethnically cleansed from Asia minor by the Turks from 1894 to 1924. Anatolia's terrain is structurally complex. A central massif composed of uplifted blocks and downfolded troughs , covered by recent deposits and giving

5978-512: The 6th century BCE. The earliest historically attested populations of Anatolia were the Hattians in central Anatolia, and Hurrians further to the east. The Hattians were an indigenous people, whose main center was the city of Hattush . Affiliation of Hattian language remains unclear, while Hurrian language belongs to a distinctive family of Hurro-Urartian languages . All of those languages are extinct; relationships with indigenous languages of

6100-1098: The Armenian Highlands to the South Caucasus and the Upper Euphrates Valley. Along with the Çoruh , these rivers are the longest in the Eastern Anatolia Region. The English-language name Anatolia derives from the Greek Ἀνατολή ( Anatolḗ ) meaning "the East" and designating (from a Greek point of view) eastern regions in general. The Greek word refers to the direction where the sun rises, coming from ἀνατέλλω anatello '(Ι) rise up', comparable to terms in other languages such as " levant " from Latin levo 'to rise', " orient " from Latin orior 'to arise, to originate', Hebrew מִזְרָח mizraḥ 'east' from זָרַח zaraḥ 'to rise, to shine', Aramaic מִדְנָח midnaḥ from דְּנַח denaḥ 'to rise, to shine'. The use of Anatolian designations has varied over time, perhaps originally referring to

6222-544: The Assyrian colony of Kanesh , use an advanced system of trading computations and credit lines. Unlike the Akkadians and Assyrians, whose Anatolian trading posts were peripheral to their core lands in Mesopotamia , the Hittites were centered at Hattusa (modern Boğazkale) in north-central Anatolia by the 17th century BCE. They were speakers of an Indo-European language, the Hittite language , or nesili (the language of Nesa) in Hittite. The Hittites originated from local ancient cultures that grew in Anatolia, in addition to

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6344-411: The Babylonians and Scythians briefly appropriating some territory. From the late 8th century BCE, a new wave of Indo-European-speaking raiders entered northern and northeast Anatolia: the Cimmerians and Scythians . The Cimmerians overran Phrygia and the Scythians threatened to do the same to Urartu and Lydia , before both were finally checked by the Assyrians. The north-western coast of Anatolia

6466-527: The Caucasus have been proposed, but are not generally accepted. The region became famous for exporting raw materials. Organized trade between Anatolia and Mesopotamia started to emerge during the period of the Akkadian Empire , and was continued and intensified during the period of the Old Assyrian Empire , between the 21st and the 18th centuries BCE. Assyrian traders were bringing tin and textiles in exchange for copper, silver or gold. Cuneiform records, dated c.  20th century BCE , found in Anatolia at

6588-399: The Egyptians, annexing much Hittite (and Hurrian) territory in these regions. After 1180 BCE, during the Late Bronze Age collapse , the Hittite Empire disintegrated into several independent Syro-Hittite states , subsequent to losing much territory to the Middle Assyrian Empire and being finally overrun by the Phrygians , another Indo-European people who are believed to have migrated from

6710-400: The Iberian Peninsula and the British Isles, as well as to the Maghreb . Most modern Europeans derive a significant part of their ancestry from these Neolithic Anatolian farmers. Neolithic Anatolia has been proposed as the homeland of the Indo-European language family , although linguists tend to favour a later origin in the steppes north of the Black Sea. However, it is clear that

6832-411: The Seha River Land (to be identified with the Hermos and/or Kaikos valley), and the kingdom of Mira-Kuwaliya with its core territory of the Maeander valley. From the 9th century BCE, Luwian regions coalesced into a number of states such as Lydia , Caria , and Lycia , all of which had Hellenic influence. Arameans encroached over the borders of south-central Anatolia in the century or so after

6954-435: The absence of secondary flow we would expect low fluid velocity at the outside bend and high fluid velocity at the inside bend. This classic fluid mechanics result is irrotational vortex flow. In the context of meandering rivers, its effects are dominated by those of secondary flow. Secondary flow : A force balance exists between pressure forces pointing to the inside bend of the river and centrifugal forces pointing to

7076-475: The administration of the Empire preferred the description Ἀνατολή ( Anatolḗ ; lit.   ' the East ' ). The endonym Ῥωμανία ( Rōmanía "the land of the Romans, i.e. the Eastern Roman Empire") was understood as another name for the province by the invading Seljuq Turks , who founded a Sultanate of Rûm in 1077. Thus (land of the) Rûm became another name for Anatolia. By the 12th century Europeans had started referring to Anatolia as Turchia . During

7198-407: The appearance of a plateau with rough terrain, is wedged between two folded mountain ranges that converge in the east. True lowland is confined to a few narrow coastal strips along the Aegean, Mediterranean, and the Black Sea coasts. Flat or gently sloping land is rare and largely confined to the deltas of the Kızıl River , the coastal plains of Çukurova and the valley floors of the Gediz River and

7320-466: The arrival of Indo-European languages. Attested for the first time in the Assyrian tablets of Nesa around 2000 BCE, they conquered Hattusa in the 18th century BCE, imposing themselves over Hattian- and Hurrian-speaking populations. According to the widely accepted Kurgan theory on the Proto-Indo-European homeland , however, the Hittites (along with the other Indo-European ancient Anatolians ) were themselves relatively recent immigrants to Anatolia from

7442-411: The average fullbank channel width. The length of the stream is measured by channel, or thalweg, length over the reach, while the bottom value of the ratio is the downvalley length or air distance of the stream between two points on it defining the reach. The sinuosity index plays a part in mathematical descriptions of streams. The index may require elaboration, because the valley may meander as well—i.e.,

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7564-422: The axis of a floodplain . The zone within which a meandering stream periodically shifts its channel is known as a meander belt . It typically ranges from 15 to 18 times the width of the channel. Over time, meanders migrate downstream, sometimes in such a short time as to create civil engineering challenges for local municipalities attempting to maintain stable roads and bridges. The degree of meandering of

7686-506: The bottom from the outside to the inside. The flow is supplied by a counter-flow across the surface from the inside to the outside. This entire situation is very similar to the Tea leaf paradox . This secondary flow carries sediment from the outside of the bend to the inside making the river more meandering. As to why streams of any size become sinuous in the first place, there are a number of theories, not necessarily mutually exclusive. The stochastic theory can take many forms but one of

7808-429: The boundary layer. Therefore, within the boundary layer, pressure force dominates and fluid moves along the bottom of the river from the outside bend to the inside bend. This initiates helicoidal flow: Along the river bed, fluid roughly follows the curve of the channel but is also forced toward the inside bend; away from the river bed, fluid also roughly follows the curve of the channel but is forced, to some extent, from

7930-401: The bulk of the area of modern-day Turkey. Nonetheless, a variety of non- Turkic languages continue to be spoken by ethnic minorities in Anatolia today, including Arabic , Kurdish , Neo-Aramaic , Armenian , the North Caucasian languages , Laz , Georgian , and Greek. Traditionally, Anatolia is considered to extend in the east to an indefinite line running from the Gulf of Alexandretta to

8052-429: The case of the Anderson Bottom Rincon, incised meanders that have either steep-sided, often vertical walls, are often, but not always, known as rincons in the southwest United States . Rincon in English is a nontechnical word in the southwest United States for either a small secluded valley, an alcove or angular recess in a cliff, or a bend in a river. The meanders of a stream or river that has cut its bed down into

8174-412: The channel of a river, stream, or other watercourse is measured by its sinuosity . The sinuosity of a watercourse is the ratio of the length of the channel to the straight line down-valley distance. Streams or rivers with a single channel and sinuosities of 1.5 or more are defined as meandering streams or rivers. The term derives from the winding river Menderes located in Asia-Minor and known to

8296-399: The coasts of Anatolia. Greeks started Western philosophy on the western coast of Anatolia ( Pre-Socratic philosophy ). In Classical antiquity , Anatolia was described by the Ancient Greek historian Herodotus and later historians as divided into regions that were diverse in culture, language, and religious practices. The northern regions included Bithynia , Paphlagonia , and Pontus ; to

8418-404: The control of the Mongols, at least nominally, through declining Seljuk sultans. The Beyliks did not mint coins in the names of their own leaders while they remained under the suzerainty of the Mongol Ilkhanids . The Osmanli ruler Osman I was the first Turkish ruler who minted coins in his own name in 1320s; they bear the legend "Minted by Osman son of Ertugrul". Since the minting of coins

8540-408: The curvature of the bend, and the faster the flow, the stronger is the cross-current and the sweeping. Due to the conservation of angular momentum the speed on the inside of the bend is faster than on the outside. Since the flow velocity is diminished, so is the centrifugal pressure. The pressure of the super-elevated column prevails, developing an unbalanced gradient that moves water back across

8662-439: The death of Alexander the Great and the subsequent breakup of the Macedonian Empire , Anatolia was ruled by a series of Hellenistic kingdoms, such as the Attalids of Pergamum and the Seleucids , the latter controlling most of Anatolia. A period of peaceful Hellenization followed, such that the local Anatolian languages had been supplanted by Greek by the 1st century BCE. In 133 BCE the last Attalid king bequeathed his kingdom to

8784-575: The decline of the Ilkhanate from 1335 to 1353, the Mongol Empire 's legacy in the region was the Uyghur Eretna Dynasty that was overthrown by Kadi Burhan al-Din in 1381. By the end of the 14th century, most of Anatolia was controlled by various Anatolian beyliks . Smyrna fell in 1330, and the last Byzantine stronghold in Anatolia, Philadelphia, fell in 1390. The Turkmen Beyliks were under

8906-540: The defeat of the Assuwa league in western Anatolia. The empire reached its height in the 13th century BCE, controlling much of Asia Minor, northwestern Syria , and northwest upper Mesopotamia. However, the Hittite advance toward the Black Sea coast was halted by the semi-nomadic pastoralist and tribal Kaskians , a non-Indo-European people who had earlier displaced the Palaic-speaking Indo-Europeans. Much of

9028-405: The downvalley length is not identical to the reach. In that case the valley index is the meander ratio of the valley while the channel index is the meander ratio of the channel. The channel sinuosity index is the channel length divided by the valley length and the standard sinuosity index is the channel index divided by the valley index. Distinctions may become even more subtle. Sinuosity Index has

9150-614: The early 20th century (see the rise of nationalism under the Ottoman Empire ). During World War I, the Armenian genocide , the Greek genocide (especially in Pontus ), and the Assyrian genocide almost entirely removed the ancient indigenous communities of Armenian , Greek , and Assyrian populations in Anatolia and surrounding regions. Following the Greco-Turkish War of 1919–1922 , most remaining ethnic Anatolian Greeks were forced out during

9272-520: The era of classical antiquity (see Classical Anatolia ), the Anatolian languages were largely replaced by the Greek language , which came to further dominate the region during the Hellenistic period and the Roman period . The Byzantine period saw the decline of Greek influence throughout the peninsula as the Byzantine–Seljuk wars enabled the incoming Seljuk Turks to establish a foothold in

9394-627: The era of the Ottoman Empire , many mapmakers referred to the mountainous plateau in eastern Anatolia as Armenia . Other contemporary sources called the same area Kurdistan . Geographers have used East Anatolian plateau , Armenian plateau and the Iranian plateau to refer to the region; the former two largely overlap. While a standard definition of Anatolia refers to the entire Asian side of Turkey, according to archaeologist Lori Khatchadourian, this difference in terminology "primarily result[s] from

9516-680: The expansionist policies of the Russian Empire in the Caucasus , many Muslim nations and groups in that region, mainly Circassians , Tatars , Azeris , Lezgis , Chechens and several Turkic groups left their homelands and settled in Anatolia. As the Ottoman Empire further shrank in the Balkan regions and then fragmented during the Balkan Wars , much of the non-Christian populations of its former possessions, mainly Balkan Muslims ( Bosniaks , Albanians , Turks , Muslim Bulgarians and Greek Muslims such as

9638-700: The fall of the Hittite empire, and some of the Syro-Hittite states in this region became an amalgam of Hittites and Arameans. These became known as Syro-Hittite states . From the 10th to late 7th centuries BCE, much of Anatolia (particularly the southeastern regions) fell to the Neo-Assyrian Empire , including all of the Syro-Hittite states , Tabal , Commagene , the Cimmerians and Scythians , and swathes of Cappadocia . The Neo-Assyrian empire collapsed due to

9760-631: The following century, the Byzantines managed to reassert their control in western and northern Anatolia. Control of Anatolia was then split between the Byzantine Empire and the Seljuk Sultanate of Rûm , with the Byzantine holdings gradually being reduced. In 1255, the Mongols swept through eastern and central Anatolia, and would remain until 1335. The Ilkhanate garrison was stationed near Ankara . After

9882-547: The formation of both entrenched meanders and ingrown meanders is thought to require that base level falls as a result of either relative change in mean sea level , isostatic or tectonic uplift, the breach of an ice or landslide dam, or regional tilting. Classic examples of incised meanders are associated with rivers in the Colorado Plateau , the Kentucky River Palisades in central Kentucky , and streams in

10004-428: The full force of the flood. After a cutoff meander is formed, river water flows into its end from the river builds small delta-like feature into either end of it during floods. These delta-like features block either end of the cutoff meander to form a stagnant oxbow lake that is separated from the flow of the fluvial channel and independent of the river. During floods, the flood waters deposit fine-grained sediment into

10126-404: The fullbank channel width and 3 to 5 times, with an average of 4.7 times, the radius of curvature at the apex. This radius is 2–3 times the channel width. A meander has a depth pattern as well. The cross-overs are marked by riffles , or shallow beds, while at the apices are pools. In a pool direction of flow is downward, scouring the bed material. The major volume, however, flows more slowly on

10248-747: The history of the Hittite Empire concerned war with the rival empires of Egypt , Assyria and the Mitanni . The Ancient Egyptians eventually withdrew from the region after failing to gain the upper hand over the Hittites and becoming wary of the power of Assyria, which had destroyed the Mitanni Empire. The Assyrians and Hittites were then left to battle over control of eastern and southern Anatolia and colonial territories in Syria . The Assyrians had better success than

10370-416: The inner side, which forms a meandering horseshoe-shaped bend. Eventually as the result of its meandering, the fluvial channel cuts through the narrow neck of the meander and forms a cutoff meander. The final break-through of the neck, which is called a neck cutoff , often occurs during a major flood because that is when the watercourse is out of its banks and can flow directly across the neck and erode it with

10492-443: The inside bank of a river bend. On the inside bend, this sediment and debris is eventually deposited on the slip-off slope of a point bar. Scroll-bars are a result of continuous lateral migration of a meander loop that creates an asymmetrical ridge and swale topography on the inside of the bends. The topography is generally parallel to the meander, and is related to migrating bar forms and back bar chutes, which carve sediment from

10614-406: The inside of the bend where, due to decreased velocity, it deposits sediment. The line of maximum depth, or channel, is the thalweg or thalweg line. It is typically designated the borderline when rivers are used as political borders. The thalweg hugs the outer banks and returns to center over the riffles. The meander arc length is the distance along the thalweg over one meander. The river length

10736-450: The inside to the outside bend. The higher velocities at the outside bend lead to higher shear stresses and therefore result in erosion. Similarly, lower velocities at the inside bend cause lower shear stresses and deposition occurs. Thus meander bends erode at the outside bend, causing the river to becoming increasingly sinuous (until cutoff events occur). Deposition at the inside bend occurs such that for most natural meandering rivers,

10858-404: The interaction of water flowing through a curved channel with the underlying river bed. This produces helicoidal flow , in which water moves from the outer to the inner bank along the river bed, then flows back to the outer bank near the surface of the river. This in turn increases carrying capacity for sediments on the outer bank and reduces it on the inner bank, so that sediments are eroded from

10980-454: The latter to the northern part of the Mesopotamian plain. According to Richard Hovannisian , this changing of toponyms was "necessary to obscure all evidence" of the Armenian presence as part of the policy of Armenian genocide denial embarked upon by the newly established Turkish government and what Hovannisian calls its "foreign collaborators". Human habitation in Anatolia dates back to

11102-420: The meanders are fixed. Various mathematical formulae relate the variables of the meander geometry. As it turns out some numerical parameters can be established, which appear in the formulae. The waveform depends ultimately on the characteristics of the flow but the parameters are independent of it and apparently are caused by geologic factors. In general the meander length is 10–14 times, with an average 11 times,

11224-574: The mid-5th century onwards, urbanism was affected negatively and began to decline, while the rural areas reached unprecedented levels of prosperity in the region. Historians and scholars continue to debate the cause of the urban decline in Byzantine Anatolia between the 6th and 7th centuries, variously attributing it to the Plague of Justinian (541), the Byzantine–Sasanian War (602–628), and

11346-418: The more heterogeneous braided river deposits. There are two distinct patterns of scroll-bar depositions; the eddy accretion scroll bar pattern and the point-bar scroll pattern. When looking down the river valley they can be distinguished because the point-bar scroll patterns are convex and the eddy accretion scroll bar patterns are concave. Scroll bars often look lighter at the tops of the ridges and darker in

11468-504: The most general statements is that of Scheidegger: "The meander train is assumed to be the result of the stochastic fluctuations of the direction of flow due to the random presence of direction-changing obstacles in the river path." Given a flat, smooth, tilted artificial surface, rainfall runs off it in sheets, but even in that case adhesion of water to the surface and cohesion of drops produce rivulets at random. Natural surfaces are rough and erodible to different degrees. The result of all

11590-468: The north. However, they did not necessarily displace the population genetically; they assimilated into the former peoples' culture, preserving the Hittite language. The Hittites adopted the Mesopotamian cuneiform script . In the Late Bronze Age, Hittite New Kingdom ( c.  1650 BCE ) was founded, becoming an empire in the 14th century BCE after the conquest of Kizzuwatna in the south-east and

11712-673: The northwest, the Galatian variant of Gaulish in Galatia until the 6th century CE, Cappadocian in the homonymous region, Armenian in the east, and Kartvelian languages in the northeast. Anatolia is known as the birthplace of minted coinage (as opposed to unminted coinage, which first appears in Mesopotamia at a much earlier date) as a medium of exchange, some time in the 7th century BCE in Lydia. The use of minted coins continued to flourish during

11834-720: The only remaining part of the Byzantine East , and thus commonly referred to (in Greek) as the Eastern part of the Empire. At the same time, the Anatolic Theme ( Ἀνατολικὸν θέμα / "the Eastern theme") was created, as a province ( theme ) covering the western and central parts of Turkey's present-day Central Anatolia Region , centered around Iconium , but ruled from the city of Amorium . The Latinized form " Anatolia ", with its -ia ending,

11956-514: The outer bank and redeposited on the inner bank of the next downstream meander. When a fluid is introduced to an initially straight channel which then bends, the sidewalls induce a pressure gradient that causes the fluid to alter course and follow the bend. From here, two opposing processes occur: (1) irrotational flow and (2) secondary flow . For a river to meander, secondary flow must dominate. Irrotational flow : From Bernoulli's equations, high pressure results in low velocity. Therefore, in

12078-403: The outside bend of the river. In the context of meandering rivers, a boundary layer exists within the thin layer of fluid that interacts with the river bed. Inside that layer and following standard boundary-layer theory, the velocity of the fluid is effectively zero. Centrifugal force, which depends on velocity, is also therefore effectively zero. Pressure force, however, remains unaffected by

12200-529: The outside of the curve and deposit sediment in the slower flowing water on the inside of the loop, in a process called lateral accretion. Scroll-bar sediments are characterized by cross-bedding and a pattern of fining upward. These characteristics are a result of the dynamic river system, where larger grains are transported during high energy flood events and then gradually die down, depositing smaller material with time (Batty 2006). Deposits for meandering rivers are generally homogeneous and laterally extensive unlike

12322-415: The oxbow lake. As a result, oxbow lakes tend to become filled in with fine-grained, organic-rich sediments over time. A point bar , which is also known as a meander bar , is a fluvial bar that is formed by the slow, often episodic, addition of individual accretions of noncohesive sediment on the inside bank of a meander by the accompanying migration of the channel toward its outer bank. This process

12444-475: The physical factors acting at random is channels that are not straight, which then progressively become sinuous. Even channels that appear straight have a sinuous thalweg that leads eventually to a sinuous channel. In the equilibrium theory, meanders decrease the stream gradient until an equilibrium between the erodibility of the terrain and the transport capacity of the stream is reached. A mass of water descending must give up potential energy , which, given

12566-552: The ranges that separate it from the Orontes valley in Syria and the Mesopotamian plain. Following the Armenian genocide , Western Armenia was renamed the Eastern Anatolia Region by the newly established Turkish government. In 1941, with the First Geography Congress which divided Turkey into seven geographical regions based on differences in climate and landscape, the eastern provinces of Turkey were placed into

12688-564: The region. Thus, the process of Anatolia's Turkification began under the Seljuk Empire in the late 11th century and continued under the Ottoman Empire until the early 20th century, when the Ottoman dynasty collapsed in the aftermath of World War I . Between 1894 and 1924, millions of non- Turkic peoples and Christians were suppressed and removed by the Ottoman Turkish authorities from

12810-577: The reign of Roman Emperor Constantine I (306–337), who created the Praetorian prefecture of the East , known in Greek as the Eastern Prefecture, encompassing all eastern regions of the Late Roman Empire and spanning from Thrace to Egypt . Only after the loss of other eastern regions during the 7th century and the reduction of Byzantine eastern domains to Asia Minor, that region became

12932-548: The rest of Europe. Following the Russo-Persian Treaty of Turkmenchay (1828) and the incorporation of Eastern Armenia into the Russian Empire, another migration involved the large Armenian population of Anatolia, which recorded significant migration rates from Western Armenia (Eastern Anatolia) toward the Russian Empire, especially toward its newly established Armenian provinces. Anatolia remained multi-ethnic until

13054-678: The river width remains nearly constant, even as the river evolves. In a speech before the Prussian Academy of Sciences in 1926, Albert Einstein suggested that because the Coriolis force of the earth can cause a small imbalance in velocity distribution, such that velocity on one bank is higher than on the other, it could trigger the erosion on one bank and deposition of sediment on the other that produces meanders However, Coriolis forces are likely insignificant compared with other forces acting to produce river meanders. The technical description of

13176-416: The same velocity at the end of the drop as at the beginning, is removed by interaction with the material of the stream bed. The shortest distance; that is, a straight channel, results in the highest energy per unit of length, disrupting the banks more, creating more sediment and aggrading the stream. The presence of meanders allows the stream to adjust the length to an equilibrium energy per unit length in which

13298-417: The sediment is deposited the vertical sequence of sediments comprising a point bar becomes finer upward within an individual point bar. For example, it is typical for point bars to fine upward from gravel at the base to fine sands at the top. The source of the sediment is typically upstream cut banks from which sand, rocks and debris has been eroded, swept, and rolled across the bed of the river and downstream to

13420-505: The shape of an incised meander is not always, if ever, "inherited", e.g., strictly from an antecedent meandering stream where its meander pattern could freely develop on a level floodplain. Instead, they argue that as fluvial incision of bedrock proceeds, the stream course is significantly modified by variations in rock type and fractures , faults , and other geological structures into either lithologically conditioned meanders or structurally controlled meanders . The oxbow lake , which

13542-516: The shifting political fortunes and cultural trajectories of the region since the nineteenth century". Turkey's First Geography Congress in 1941 created two geographical regions of Turkey to the east of the Gulf of Iskenderun-Black Sea line, the Eastern Anatolia Region and the Southeastern Anatolia Region , the former largely corresponding to the western part of the Armenian Highlands,

13664-445: The shortest possible path). It is calculated as the length of the stream divided by the length of the valley . A perfectly straight river would have a meander ratio of 1 (it would be the same length as its valley), while the higher this ratio is above 1, the more the river meanders. Sinuosity indices are calculated from the map or from an aerial photograph measured over a distance called the reach , which should be at least 20 times

13786-411: The sinuous axis. A loop at the apex has an outer or concave bank and an inner or convex bank. The meander belt is defined by an average meander width measured from outer bank to outer bank instead of from centerline to centerline. If there is a flood plain , it extends beyond the meander belt. The meander is then said to be free—it can be found anywhere in the flood plain. If there is no flood plain,

13908-767: The southeast, while Galatian , a Celtic language , was spoken throughout Galatia in the central peninsula. Among the other peoples who established a significant presence in ancient Anatolia were the Galatians , the Hurrians , the Assyrians , the Armenians , the Hattians , and the Cimmerians , as well as some of the ancient Greek tribes , including the Ionians , the Dorians , and the Aeolians . In

14030-419: The stream carries away all the sediment that it produces. Geomorphic refers to the surface structure of the terrain. Morphotectonic means having to do with the deeper, or tectonic (plate) structure of the rock. The features included under these categories are not random and guide streams into non-random paths. They are predictable obstacles that instigate meander formation by deflecting the stream. For example,

14152-403: The stream might be guided into a fault line (morphotectonic). A cut bank is an often vertical bank or cliff that forms where the outside, concave bank of a meander cuts into the floodplain or valley wall of a river or stream. A cutbank is also known either as a river-cut cliff , river cliff , or a bluff and spelled as cutbank . Erosion that forms a cut bank occurs at the outside bank of

14274-416: The swales. This is because the tops can be shaped by wind, either adding fine grains or by keeping the area unvegetated, while the darkness in the swales can be attributed to silts and clays washing in during high water periods. This added sediment in addition to water that catches in the swales is in turn is a favorable environment for vegetation that will also accumulate in the swales. Depending upon whether

14396-406: The trees to fall into the river. A meander cutoff , also known as either a cutoff meander or abandoned meander , is a meander that has been abandoned by its stream after the formation of a neck cutoff. A lake that occupies a cutoff meander is known as an oxbow lake . Cutoff meanders that have cut downward into the underlying bedrock are known in general as incised cutoff meanders . As in

14518-417: The west were Mysia , Lydia , and Caria; and Lycia , Pamphylia , and Cilicia belonged to the southern shore. There were also several inland regions: Phrygia , Cappadocia , Pisidia , and Galatia . Languages spoken included the late surviving Anatolic languages , Isaurian , and Pisidian , Greek in western and coastal regions, Phrygian spoken until the 7th century CE, local variants of Thracian in

14640-748: Was a major migration of Anatolian Neolithic Farmers into Europe , with their descendants coming to dominate the continent as far west as the Iberian Peninsula and the British Isles . The earliest recorded inhabitants of Anatolia , who were neither Indo-European nor Semitic , were gradually absorbed by the incoming Indo-European Anatolian peoples , who spoke the now-extinct Anatolian languages . The major Anatolian languages included Hittite , Luwian , and Lydian ; other local languages, albeit poorly attested, included Phrygian and Mysian . The Hurro-Urartian languages were spoken throughout Mitanni in

14762-607: Was a prerogative accorded in Islamic practice only to a sovereign , it can be considered that the Osmanli, or Ottoman Turks, had become formally independent from the Mongol Khans. Among the Turkish leaders, the Ottomans emerged as great power under Osman I and his son Orhan . The Anatolian beyliks were successively absorbed into the rising Ottoman Empire during the 15th century. It

14884-532: Was inhabited by Greeks of the Achaean / Mycenaean culture from the 20th century BCE, related to the Greeks of southeastern Europe and the Aegean . Beginning with the Bronze Age collapse at the end of the 2nd millennium BCE, the west coast of Anatolia was settled by Ionian Greeks , usurping the area of the related but earlier Mycenaean Greeks . Over several centuries, numerous Ancient Greek city-states were established on

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