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108-418: Chains of barrier islands can be found along approximately 13-15% of the world's coastlines. They display different settings, suggesting that they can form and be maintained in a variety of environments. Numerous theories have been given to explain their formation. A human-made offshore structure constructed parallel to the shore is called a breakwater . In terms of coastal morphodynamics , it acts similarly to

216-434: A jetty or a mole , may be connected to land or freestanding, and may contain a walkway or road for vehicle access. Part of a coastal management system, breakwaters are installed parallel to the shore to minimize erosion . On beaches where longshore drift threatens the erosion of beach material, smaller structures on the beach may be installed, usually perpendicular to the water's edge. Their action on waves and current

324-418: A barrier island does not receive enough sediment to grow, repeated washovers from storms will migrate the island towards the mainland. Wave-dominated barrier islands may eventually develop into mixed-energy barrier islands. Mixed-energy barrier islands are molded by both wave energy and tidal flux. The flow of a tidal prism moves sand. Sand accumulates at both the inshore and off shore sides of an inlet, forming

432-650: A barrier island. Many have large numbers of barrier islands; Florida, for instance, had 29 (in 1997) in just 300 kilometres (190 mi) along the west (Gulf) coast of the Florida peninsula, plus about 20 others on the east coast and several barrier islands and spits along the panhandle coast. Padre Island , in Texas, is the world's longest barrier island; other well-known islands on the Gulf Coast include Galveston Island in Texas and Sanibel and Captiva Islands in Florida. Those on

540-506: A characteristic drumstick shape, with a wide portion at the northern end near the mouth of Phillipi Creek. Barrier islands are critically important in mitigating ocean swells and other storm events for the water systems on the mainland side of the barrier island, as well as protecting the coastline. This effectively creates a unique environment of relatively low energy, brackish water . Multiple wetland systems such as lagoons, estuaries, and/or marshes can result from such conditions depending on

648-425: A flood delta or shoal on the bay or lagoon side of the inlet (from sand carried in on a flood tide), and an ebb delta or shoal on the open water side (from sand carried out by an ebb tide). Large tidal prisms tend to produce large ebb shoals, which may rise enough to be exposed at low tide. Ebb shoals refract waves approaching the inlet, locally reversing the longshore current moving sand along the coast. This can modify

756-415: A function of the distance the breakwaters are built from the coast, the direction at which the wave hits the breakwater, and the angle at which the breakwater is built (relative to the coast). Of these three, the angle at which the breakwater is built is most important in the engineered formation of salients. The angle at which the breakwater is built determines the new direction of the waves (after they've hit

864-402: A naturally occurring barrier island by dissipating and reducing the energy of the waves and currents striking the coast. Hence, it is an important aspect of coastal engineering . The shoreface is the part of the barrier where the ocean meets the shore of the island. The barrier island body itself separates the shoreface from the backshore and lagoon / tidal flat area. Characteristics common to

972-556: A quarter of the population of Lewiston, Waterville , and Biddeford are Franco-American. Most of the residents of the Mid Coast and Down East sections are chiefly of British heritage. Smaller numbers of various other groups, including Irish , Italian , Swedish and Polish , have settled throughout the state since the late 19th and early 20th century immigration waves. Today there are four federally recognized tribes in Maine, including

1080-530: A separate state. On March 15, 1820, under the Missouri Compromise , Maine was admitted to the Union as the 23rd state. Today, Maine is known for its jagged, rocky Atlantic Ocean and bay-shore coastlines, mountains, heavily forested interior, and its cuisine, particularly wild lowbush blueberries and seafood such as lobster and clams . Coastal and Down East Maine have emerged as important centers for

1188-442: A significant saving over revetment breakwaters. An additional rubble mound is sometimes placed in front of the vertical structure in order to absorb wave energy and thus reduce wave reflection and horizontal wave pressure on the vertical wall. Such a design provides additional protection on the sea side and a quay wall on the inner side of the breakwater, but it can enhance wave overtopping . A similar but more sophisticated concept

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1296-600: A single island until a storm created a channel between them in 1896). North Stradbroke Island is the second largest sand island in the world and Moreton Island is the third largest. Fraser Island , another barrier island lying 200 km north of Moreton Bay on the same coastline, is the largest sand island in the world. Barrier islands are found most prominently on the United States' East and Gulf Coasts, where every state, from Maine to Florida (East Coast) and from Florida to Texas ( Gulf coast ), features at least part of

1404-403: A small tidal range and a wave-dominated coast, there must be a relatively low gradient shelf. Otherwise, sand accumulation into a sandbar would not occur and instead would be dispersed throughout the shore. An ample sediment supply is also a requirement for barrier island formation. This often includes fluvial deposits and glacial deposits . The last major requirement for barrier island formation

1512-718: Is a state in the New England region of the United States , and the northeastern most state in the Lower 48 . It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and northwest, and shares a maritime border with Nova Scotia . Maine is the largest state in New England by total area, nearly larger than

1620-414: Is a stable sea level. It is especially important for sea level to remain relatively unchanged during barrier island formation and growth. If sea level changes are too drastic, time will be insufficient for wave action to accumulate sand into a dune, which will eventually become a barrier island through aggradation . The formation of barrier islands requires a constant sea level so that waves can concentrate

1728-651: Is a wave-absorbing caisson, including various types of perforation in the front wall. Such structures have been used successfully in the offshore oil-industry, but also on coastal projects requiring rather low-crested structures (e.g. on an urban promenade where the sea view is an important aspect, as seen in Beirut and Monaco ). In the latter, a project is presently ongoing at the Anse du Portier including 18 wave-absorbing 27 m (89 ft) high caissons. Wave attenuators consist of concrete elements placed horizontally one foot under

1836-495: Is constantly affected by wave action. Cross-bedding and lamination are present and coarser sands are present because of the high energy present by the crashing of the waves. The sand is also very well sorted . The backshore is always above the highest water level point. The berm is also found here which marks the boundary between the foreshore and backshore. Wind is the important factor here, not water. During strong storms high waves and wind can deliver and erode sediment from

1944-518: Is designed to absorb the energy of the waves that hit it, either by using mass (e.g. with caissons), or by using a revetment slope (e.g. with rock or concrete armour units). In coastal engineering , a revetment is a land-backed structure whilst a breakwater is a sea-backed structure (i.e. water on both sides). Rubble mound breakwaters use structural voids to dissipate the wave energy. Rubble mound breakwaters consist of piles of stones more or less sorted according to their unit weight: smaller stones for

2052-547: Is evident with migratory birds like piping plovers , American oystercatcher , and northern harrier , as well as resident species like black-capped chickadees , blue jays , and barred owls . Wetlands provide habitat for amphibians such as spotted salamanders , wood frogs , and toads. Freshwater habitats support fish species like brook trout , landlocked salmon , and multiple gamefish , while marine life in offshore waters includes Atlantic puffins , harbor seals , minke whales , and lobster . Maine's abundance of lobster makes

2160-527: Is forested or unclaimed, the most forest cover of any U.S. state . In the wooded areas of the interior lies much uninhabited land, some of which does not have formal political organization into local units (a rarity in New England). The Northwest Aroostook unorganized territory in the northern part of the state, for example, has an area of 2,668 square miles (6,910 km ) and a population of 10, or one person for every 267 square miles (690 km ). Maine

2268-651: Is in the temperate broadleaf and mixed forests biome . The land near the southern and central Atlantic coast is covered by the mixed oaks of the Northeastern coastal forests . The remainder of the state, including the North Woods , is covered by the New England–Acadian forests . Maine has almost 230 miles (400 km) of ocean coastline (and 3,500 miles (5,600 km) of tidal coastline). West Quoddy Head in Lubec

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2376-465: Is intended to slow the longshore drift and discourage mobilisation of beach material. In this usage they are more usually referred to as groynes . Breakwaters reduce the intensity of wave action in inshore waters and thereby provide safe harbourage. Breakwaters may also be small structures designed to protect a gently sloping beach to reduce coastal erosion ; they are placed 100–300 feet (30–90 m) offshore in relatively shallow water. An anchorage

2484-447: Is less than a critical value. The island did not narrow below these values because overwash was effective at transporting sediment over the barrier island, thereby keeping pace with the rate of ocean shoreline recession. Sections of the island with greater widths experienced washover deposits that did not reach the bayshore, and the island narrowed by ocean shoreline recession until it reached the critical width. The only process that widened

2592-430: Is limited in practice by the natural fracture properties of locally available rock. Shaped concrete armour units (such as Dolos , Xbloc , Tetrapod , etc.) can be provided in up to approximately 40 tonnes (e.g. Jorf Lasfar , Morocco), before they become vulnerable to damage under self weight, wave impact and thermal cracking of the complex shapes during casting/curing. Where the very largest armour units are required for

2700-462: Is now Odanak . The other Abenaki tribes suffered several severe defeats, particularly during Dummer's War , with the capture of Norridgewock in 1724 and the defeat of the Pequawket in 1725, which significantly reduced their numbers. They finally withdrew to Canada , where they were settled at Bécancour and Sillery , and later at St. Francis, along with other refugee tribes from the south. Maine

2808-809: Is only safe if ships anchored there are protected from the force of powerful waves by some large structure which they can shelter behind. Natural harbours are formed by such barriers as headlands or reefs . Artificial harbours can be created with the help of breakwaters. Mobile harbours, such as the D-Day Mulberry harbours , were floated into position and acted as breakwaters. Some natural harbours, such as those in Plymouth Sound , Portland Harbour , and Cherbourg , have been enhanced or extended by breakwaters made of rock. Types of breakwaters include vertical wall breakwater, mound breakwater and mound with superstructure or composite breakwater. A breakwater structure

2916-516: Is part of a cultural region known as Acadia that goes over the border into New Brunswick . Along with the Acadian population in the north, many French-Canadians came from Quebec as immigrants between 1840 and 1930. The upper Saint John River valley area was once part of the so-called Republic of Madawaska , before the frontier was decided in the Webster-Ashburton Treaty of 1842. Over

3024-526: Is the easternmost point of land in the 48 contiguous states. Along the famous rock-bound coast of Maine are lighthouses, beaches, fishing villages, and thousands of offshore islands, including the Isles of Shoals which straddle the New Hampshire border. There are jagged rocks and cliffs and many bays and inlets. Inland are lakes, rivers, forests, and mountains. This visual contrast of forested slopes sweeping down to

3132-479: Is the most densely populated with nearly 40% of Maine's population. This area spans three counties and includes many farms and wooded areas; the 2016 population of Portland proper was 66,937. Maine has experienced a very slow rate of population growth since the 1990 census; its rate of growth (0.57%) since the 2010 census ranks 45th of the 50 states. In 2021 and 2022, however, Maine had the highest proportion of arriving residents to departing residents of any state in

3240-404: Is to the north and northeast, and the province of Quebec is to the northwest. Maine is the northernmost and largest state in New England, accounting for almost half of the region's entire land area. Maine is the only state to border exactly one other American state. Approximately half the area of Maine lies on each side of the 45th parallel north in latitude . Maine is the easternmost state in

3348-807: The Banyak Islands (chiefly Tuangku and Bangkaru), Nias , the Batu Islands (notably Pini, Tanahmasa and Tanahbala), the Mentawai Islands (mainly Siberut , Sipura , North Pagai and South Pagai Islands) and Enggano Island . Barrier islands can be observed in the Baltic Sea from Poland to Lithuania as well as distinctly in the Wadden Islands , which stretch from the Netherlands to Denmark. Lido di Venezia and Pellestrina are notable barrier islands of

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3456-583: The Confederate Army during the Battle of Gettysburg . Four U.S. Navy ships have been named USS Maine , most famously the armored cruiser USS  Maine  (ACR-1) , whose sinking by an explosion on February 15, 1898, precipitated the Spanish–American War . To the south and east is the Gulf of Maine , and to the west is the state of New Hampshire . The Canadian province of New Brunswick

3564-473: The Contiguous United States both in its extreme points and its geographic center. The town of Lubec is the easternmost organized settlement in the United States. Its Quoddy Head Lighthouse is also the closest place in the United States to Africa and Europe. Estcourt Station is Maine's northernmost point, as well as the northernmost point in New England. (For more information see extreme points of

3672-488: The Eastern white pine . Coastal regions are characterized by hardy sea milkwort , sea-blight , bayberry , and the invasive rugosa rose . Maine's terrestrial fauna comprises mammals such as moose , black bears , and white-tailed deer , along with smaller species like red squirrels , snowshoe hares , and raccoons . Maine has the largest populations of moose and black bears in the contiguous United States. Avian diversity

3780-762: The Kennebec River and St. Croix River notionally became Cornwall County, Province of New York under a 1664 grant from Charles II of England to his brother James , at the time the Duke of York . Some of this land was claimed by New France as part of Acadia . All of the English settlements in the Massachusetts Bay Colony and the Province of New York became part of the Dominion of New England in 1686. All of present-day Maine

3888-568: The Lagoon of Venice which have for centuries protected the city of Venice in Italy. Chesil Beach on the south coast of England developed as a barrier beach. Barrier beaches are also found in the north of the Azov and Black seas . Water levels may be higher than the island during storm events. This situation can lead to overwash , which brings sand from the front of the island to the top and/or landward side of

3996-464: The Mississippi River delta have been reworked by wave action, forming beach ridge complexes. Prolonged sinking of the marshes behind the barriers has converted these former vegetated wetlands to open-water areas. In a period of 125 years, from 1853 to 1978, two small semi-protected bays behind the barrier developed as the large water body of Lake Pelto, leading to Isles Dernieres 's detachment from

4104-528: The Plymouth Company in 1607. A number of English settlements were established along the coast of Maine in the 1620s, although the rugged climate and conflict with the local Indigenous people caused many to fail. As Maine entered the 18th century, only a half dozen European settlements had survived. Loyalist and Patriot forces contended for Maine's territory during the American Revolution . During

4212-606: The Province of Maine in a 1622 land patent. The part of western Maine north of the Kennebec River was more sparsely settled and was known in the 17th century as the Territory of Sagadahock . A second settlement was attempted in 1623 by English explorer and naval Captain Christopher Levett at a place called York , where he had been granted 6,000 acres (24 km ) by King Charles I of England. It also failed. The 1622 patent of

4320-598: The Wabanaki Confederacy , aiding the Wampanoag of Massachusetts and the Mahican of New York . Afterwards, many of these people were driven from their natural territories, but most of Maine's tribes continued, unchanged, until the American Revolution . Before this point, however, most of these people were considered separate nations. Many had adapted to living in permanent, Iroquois -inspired settlements, while those along

4428-622: The War of 1812 , the largely undefended eastern region of Maine was occupied by British forces with the goal of annexing it to Canada via the Colony of New Ireland , but returned to the United States following failed British offensives on the northern border, mid-Atlantic and south which produced a peace treaty that restored the pre-war boundaries. Maine was part of the Commonwealth of Massachusetts until 1820 when it voted to secede from Massachusetts to become

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4536-503: The creative economy , especially in the vicinity of Portland , which has also brought gentrification to the city and its metropolitan area. The earliest known inhabitants of the territory that is now Maine were Algonquian-speaking Wabanaki peoples, including the Passamaquoddy , Maliseet , Penobscot , Androscoggin , and Kennebec. During the later King Philip's War , many of these peoples would merge in one form or another to become

4644-449: The upper shoreface are fine sands with mud and possibly silt. Further out into the ocean the sediment becomes finer. The effect of waves at this point is weak because of the depth. Bioturbation is common and many fossils can be found in upper shoreface deposits in the geologic record . The middle shoreface is located in the upper shoreface. The middle shoreface is strongly influenced by wave action because of its depth. Closer to shore

4752-690: The American Revolution and the War of 1812, with the British occupying eastern Maine in both conflicts via the Colony of New Ireland . The territory of Maine was confirmed as part of Massachusetts when the United States was formed following the Treaty of Paris ending the revolution, although the final border with British North America was not established until the Webster–Ashburton Treaty of 1842. Maine

4860-976: The East Coast include Miami Beach and Palm Beach in Florida; Hatteras Island in North Carolina; Assateague Island in Virginia and Maryland ; Absecon Island in New Jersey, where Atlantic City is located; and Jones Beach Island and Fire Island , both off Long Island in New York. No barrier islands are found on the Pacific Coast of the United States due to the rocky shore and short continental shelf, but barrier peninsulas can be found. Barrier islands can also be seen on Alaska 's Arctic coast. Barrier Islands can also be found in Maritime Canada, and other places along

4968-553: The Gulf coast of the Florida peninsula, including: the North and South Anclote Bars associated with Anclote Key , Three Rooker Island , Shell Key , and South Bunces Key . American geologist Grove Karl Gilbert first argued in 1885 that the barrier sediments came from longshore sources. He proposed that sediment moving in the breaker zone through agitation by waves in longshore drift would construct spits extending from headlands parallel to

5076-560: The Mediterranean Sea and the Gulf of Mexico . Areas with relatively small tides and ample sand supply favor barrier island formation . Moreton Bay , on the east coast of Australia and directly east of Brisbane , is sheltered from the Pacific Ocean by a chain of very large barrier islands. Running north to south they are Bribie Island , Moreton Island , North Stradbroke Island and South Stradbroke Island (the last two used to be

5184-466: The Newport breakwater. The dissipation of energy and relative calm water created in the lee of the breakwaters often encourage accretion of sediment (as per the design of the breakwater scheme). However, this can lead to excessive salient build up, resulting in tombolo formation, which reduces longshore drift shoreward of the breakwaters. This trapping of sediment can cause adverse effects down-drift of

5292-567: The Province of Maine was split at the Piscataqua River into the Province of New Hampshire to the south and New Somersetshire to the north. A disputed 1630 patent split off the area around present-day Saco as Lygonia . Justifying its actions with a 1652 geographic survey that showed an overlapping patent, the Massachusetts Bay Colony had seized New Somersetshire and Lygonia by force by 1658. The Territory of Sagadahock between

5400-578: The United States ) Maine's Moosehead Lake is the largest lake wholly in New England, since Lake Champlain is located between Vermont , New York , and Quebec . A number of other Maine lakes, such as South Twin Lake , are described by Thoreau in The Maine Woods (1864). Mount Katahdin is the northern terminus of the Appalachian Trail , which extends southerly to Springer Mountain , Georgia , and

5508-520: The United States Army Corps of Engineers Coastal engineering manual (available for free online) and elsewhere. For detailed design the use of scaled physical hydraulic models remains the most reliable method for predicting real-life behavior of these complex structures. Breakwaters are subject to damage and overtopping in severe storms. Some may also have the effect of creating unique types of waves that attract surfers, such as The Wedge at

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5616-452: The United States. According to the 2010 census , Maine has the highest percentage of non-Hispanic White of any state, at 94.4% of the total population. In 2011, 89.0% of all births in the state were to non-Hispanic White parents. Maine also has the second-highest residential senior population. According to HUD 's 2022 Annual Homeless Assessment Report , there were an estimated 4,411 homeless people in Maine. The table below shows

5724-413: The backshore. Coastal dunes , created by wind, are typical of a barrier island. They are located at the top of the backshore. The dunes will display characteristics of typical aeolian wind-blown dunes. The difference is that dunes on a barrier island typically contain coastal vegetation roots and marine bioturbation. The lagoon and tidal flat area is located behind the dune and backshore area. Here

5832-419: The barrier beyond the critical width was breaching, formation of a partially subaerial flood shoal, and subsequent inlet closure. Critical barrier width can be defined as the smallest cross-shore dimension that minimizes net loss of sediment from the barrier island over the defined project lifetime. The magnitude of critical width is related to sources and sinks of sand in the system, such as the volume stored in

5940-641: The breakwaters), and in turn the direction that sediment will flow and accumulate over time. The reduced heterogeneity in sea floor landscape introduced by breakwaters can lead to reduced species abundance and diversity in the surrounding ecosystems. As a result of the reduced heterogeneity and decreased depths that breakwaters produce due to sediment build up, the UV exposure and temperature in surrounding waters increase, which may disrupt surrounding ecosystems. There are two main types of offshore breakwater (also called detached breakwater): single and multiple. Single, as

6048-403: The breakwaters, leading to beach sediment starvation and increased coastal erosion . This may then lead to further engineering protection being needed down-drift of the breakwater development. Sediment accumulation in the areas surrounding breakwaters can cause flat areas with reduced depths, which changes the topographic landscape of the seabed. Salient formations as a result of breakwaters are

6156-449: The choice depending on tidal range and water depth. They usually consist of large pieces of rock (granite) weighing up to 10–15 tonnes each, or rubble-mound. Their design is influenced by the angle of wave approach and other environmental parameters. Breakwater construction can be either parallel or perpendicular to the coast, depending on the shoreline requirements. Maine Maine ( / m eɪ n / MAYN )

6264-406: The coast tended to move from summer villages to winter villages on a yearly cycle. They would usually winter inland and head to the coasts by summer. European contact with what is now called Maine may have started around 1200 CE when Vikings are believed to have interacted with the native Penobscot in present-day Hancock County , most likely through trade. If confirmed, this would make Maine

6372-503: The coast. A good example is found at Miramichi Bay , New Brunswick , where Portage Island as well as Fox Island and Hay Island protect the inner bay from storms in the Gulf of Saint Lawrence . Mexico's Gulf of Mexico coast has numerous barrier islands and barrier peninsulas. Barrier islands are more prevalent in the north of both of New Zealand's main islands. Notable barrier islands in New Zealand include Matakana Island , which guards

6480-462: The coast. The subsequent breaching of spits by storm waves would form barrier islands. William John McGee reasoned in 1890 that the East and Gulf coasts of the United States were undergoing submergence, as evidenced by the many drowned river valleys that occur along these coasts, including Raritan , Delaware and Chesapeake bays. He believed that during submergence, coastal ridges were separated from

6588-461: The collided wave energy and prevent the generation of standing waves. As design wave heights get larger, rubble mound breakwaters require larger armour units to resist the wave forces. These armour units can be formed of concrete or natural rock. The largest standard grading for rock armour units given in CIRIA 683 "The Rock Manual" is 10–15 tonnes. Larger gradings may be available, but the ultimate size

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6696-430: The combined area of the remaining five states. Of the 50 U.S. states , it is the 12th-smallest by area , the 9th-least populous , the 13th-least densely populated , and the most rural. Maine's capital is Augusta , and its most populous city is Portland , with a total population of 68,408, as of the 2020 census . The territory of Maine has been inhabited by Indigenous populations for about 12,000 years, after

6804-461: The core and larger stones as an armour layer protecting the core from wave attack. Rock or concrete armour units on the outside of the structure absorb most of the energy, while gravels or sands prevent the wave energy's continuing through the breakwater core. The slopes of the revetment are typically between 1:1 and 1:2, depending upon the materials used. In shallow water, revetment breakwaters are usually relatively inexpensive. As water depth increases,

6912-412: The country, with 1.8 arrivals for every departure. The modest population growth in the state has been concentrated in the southern coastal counties; with more diverse populations slowly moving into these areas of the state. However, the northern, more rural areas of the state have experienced a slight decline in population from 2010 to 2016. As of 2020, Maine has the highest population age 65 or older in

7020-865: The development of all barriers, which are distributed extensively along the world's coastlines. Scientists accept the idea that barrier islands, including other barrier types, can form by a number of different mechanisms. There appears to be some general requirements for formation. Barrier island systems develop most easily on wave-dominated coasts with a small to moderate tidal range. Coasts are classified into three groups based on tidal range : microtidal, 0–2 meter tidal range; mesotidal, 2–4 meter tidal range; and macrotidal, >4 meter tidal range. Barrier islands tend to form primarily along microtidal coasts, where they tend to be well developed and nearly continuous. They are less frequently formed in mesotidal coasts, where they are typically short with tidal inlets common. Barrier islands are very rare along macrotidal coasts. Along with

7128-621: The disputed areas containing land. Also in this easternmost area in the Bay of Fundy is the Old Sow , the largest tidal whirlpool in the Western Hemisphere . Maine is the least densely populated state east of the Mississippi River . It is called the Pine Tree State due to its largest distribution and presence of pine , including Pinus strobus and Pinus resinosa . Over 80% of its total area

7236-551: The dunes and the net long-shore and cross-shore sand transport, as well as the island elevation. The concept of critical width is important for large-scale barrier island restoration, in which islands are reconstructed to optimum height, width, and length for providing protection for estuaries, bays, marshes and mainland beaches. Scientists have proposed numerous explanations for the formation of barrier islands for more than 150 years. There are three major theories: offshore bar, spit accretion, and submergence. No single theory can explain

7344-714: The early 1700s to Kahnewake , a Catholic Mohawk village near Montreal , where some were adopted and others ransomed. After the British defeated the French in Acadia in the 1740s, the territory from the Penobscot River east fell under the nominal authority of the Province of Nova Scotia , and together with present-day New Brunswick formed the Nova Scotia county of Sunbury , with its court of general sessions at Campobello. American and British forces contended for Maine's territory during

7452-537: The ebb shoal into swash bars, which migrate into the end of the island up current from the inlet, adding to the barrier's width near the inlet (creating a "drumstick" barrier island). This process captures sand that is carried by the longshore current, preventing it from reaching the downcurrent side of the inlet, starving that island. Many of the Sea Islands in the U.S. state of Georgia are relatively wide compared to their shore-parallel length. Siesta Key, Florida has

7560-525: The effect of the incident wave, creates waves in phase opposition to the incident wave downstream from the slabs. A submerged flexible mound breakwater can be employed for wave control in shallow water as an advanced alternative to the conventional rigid submerged designs. Further to the fact that, the construction cost of the submerged flexible mound breakwaters is less than that of the conventional submerged breakwaters, ships and marine organisms can pass them, if being deep enough. These marine structures reduce

7668-517: The entire length of the sound. These features also have made it attractive for boat builders, such as the prestigious Hinckley Yachts . Bubble Rock, a glacial erratic , is a large boulder perched on the edge of Bubble Mountain in Acadia National Park . By analyzing the type of granite, geologists discovered that glaciers carried Bubble Rock to its present location from near Lucerne , 30 miles (48 km) away. The Iapetus Suture runs through

7776-572: The entrance to Tauranga Harbour , and Rabbit Island , at the southern end of Tasman Bay . See also Nelson Harbour's Boulder Bank , below. The Vypin Island in the Southwest coast of India in Kerala is 27 km long. It is also one of the most densely populated islands in the world. The Indonesian Barrier Islands lie off the western coast of Sumatra . From north to south along this coast they include Simeulue ,

7884-630: The following year, keeping a balance between slave and free states. Maine's original state capital was Portland, Maine's largest city, until it was moved to the more central Augusta in 1832. The principal office of the Maine Supreme Judicial Court remains in Portland. The 20th Maine Volunteer Infantry Regiment , under the command of Colonel Joshua Lawrence Chamberlain , prevented the Union Army from being flanked at Little Round Top by

7992-406: The free surface, positioned along a line parallel to the coast. Wave attenuators have four slabs facing the sea, one vertical slab, and two slabs facing the land; each slab is separated from the next by a space of 200 millimetres (7.9 in). The row of four sea-facing and two land-facing slabs reflects offshore wave by the action of the volume of water located under it which, made to oscillate under

8100-417: The glaciers retreated during the last ice age . At the time of European arrival, several Algonquian -speaking nations governed the area and these nations are now known as the Wabanaki Confederacy . The first European settlement in the area was by the French in 1604 on Saint Croix Island , founded by Pierre Dugua, Sieur de Mons . The first English settlement was the short-lived Popham Colony , established by

8208-427: The island at an angle will carry sediment long, extending the island. Longshore currents, and the resultant extension, are usually in one direction, but in some circumstances the currents and extensions can occur towards both ends of the island (as occurs on Anclote Key , Three Rooker Bar , and Sand Key , on the Gulf Coast of Florida). Washover fans on the lagoon side of barriers, where storm surges have over-topped

8316-524: The island, are common, especially on younger barrier islands. Wave-dominated barriers are also susceptible to being breached by storms, creating new inlets. Such inlets may close as sediment is carried in them by longshore currents, but may become permanent if the tidal prism (volumn and force of tidal flow) is large enough. Older barrier islands that have accumulated dunes are less subject to washovers and opening of inlets. Wave-dominated islands require an abundant supply of sediment to grow and develop dunes. If

8424-406: The island. This process leads to the evolution and migration of the barrier island. Barrier islands are often formed to have a certain width. The term "critical width concept" has been discussed with reference to barrier islands, overwash, and washover deposits since the 1970s. The concept basically states that overwash processes were effective in migration of the barrier only where the barrier width

8532-528: The late spring and summer months are usually driest—a rarity across the Eastern United States. Maine has fewer days of thunderstorms than any other state east of the Rockies , with most of the state averaging fewer than twenty days of thunderstorms a year. Tornadoes are rare in Maine, with the state averaging two per year, although this number is increasing. Most severe thunderstorms and tornadoes occur in

8640-536: The mainland, and lagoons formed behind the ridges. He used the Mississippi–Alabama barrier islands (consists of Cat , Ship , Horn , Petit Bois and Dauphin Islands) as an example where coastal submergence formed barrier islands. His interpretation was later shown to be incorrect when the ages of the coastal stratigraphy and sediment were more accurately determined. Along the coast of Louisiana , former lobes of

8748-572: The mainland. An unusual natural structure in New Zealand may give clues to the formation processes of barrier islands. The Boulder Bank , at the entrance to Nelson Haven at the northern end of the South Island , is a unique 13 km-long stretch of rocky substrate a few metres in width. It is not strictly a barrier island, as it is linked to the mainland at one end. The Boulder Bank is composed of granodiorite from Mackay Bluff, which lies close to

8856-450: The material requirements—and hence costs—increase significantly. Caisson breakwaters typically have vertical sides and are usually erected where it is desirable to berth one or more vessels on the inner face of the breakwater. They use the mass of the caisson and the fill within it to resist the overturning forces applied by waves hitting them. They are relatively expensive to construct in shallow water, but in deeper sites they can offer

8964-597: The melting of heavy glacier ice caused a slight rebounding effect of underlying rock; this land rise, however, was not enough to eliminate all the effect of the rising sea level and its invasion of former land features. Much of Maine's geomorphology was created by extended glacial activity at the end of the last ice age . Prominent glacial features include Somes Sound and Bubble Rock, both part of Acadia National Park on Mount Desert Island. Carved by glaciers, Somes Sound reaches depths of 175 feet (50 m). The extreme depth and steep drop-off allow large ships to navigate almost

9072-623: The most exposed locations in very deep water, armour units are most often formed of concrete cubes, which have been used up to ~ 195 tonnes Archived 2019-05-12 at the Wayback Machine for the tip of the breakwater at Punta Langosteira near La Coruña, Spain. Preliminary design of armour unit size is often undertaken using the Hudson's equation , Van der Meer and more recently Van Gent et al.; these methods are all described in CIRIA 683 "The Rock Manual" and

9180-481: The most relevant evidence being the Maine Penny , an 11th-century Norwegian coin found at a Native American dig site in 1954. The first European confirmed settlement in modern-day Maine was in 1604 on Saint Croix Island , led by French explorer Pierre Dugua, Sieur de Mons . His party included Samuel de Champlain , noted as an explorer. The French named the entire area Acadia , including the portion that later became

9288-414: The name suggests, means the breakwater consists of one unbroken barrier, while multiple breakwaters (in numbers anywhere from two to twenty) are positioned with gaps in between (160–980 feet or 50–300 metres). The length of the gap is largely governed by the interacting wavelengths. Breakwaters may be either fixed or floating, and impermeable or permeable to allow sediment transfer shoreward of the structures,

9396-657: The north and west of the state, being underlain by the ancient Laurentian terrane , and the south and east underlain by the Avalonian terrane . Acadia National Park is the only national park in New England. Areas under the protection and management of the National Park Service include: Lands under the control of the state of Maine include: Maine has a humid continental climate ( Köppen climate classification Dfb ), with warm and sometimes humid summers, and long, cold and very snowy winters. Winters are especially severe in

9504-530: The northern and western parts of Maine, while coastal areas are moderated slightly by the Atlantic Ocean , resulting in marginally milder winters and cooler summers than inland regions. Daytime highs are generally in the 75–85 °F (24–29 °C) range throughout the state in July, with overnight lows in the high 50s   °F (around 15   °C). January temperatures range from highs near 30 °F (−1 °C) on

9612-627: The point where the bank joins the mainland. It is still debated what process or processes have resulted in this odd structure, though longshore drift is the most accepted hypothesis. Studies have been conducted since 1892 to determine the speed of boulder movement. Rates of the top-course gravel movement have been estimated at 7.5 metres a year. Richard Davis distinguishes two types of barrier islands, wave-dominated and mixed-energy. Wave-dominated barrier islands are long, low, and narrow, and usually are bounded by unstable inlets at either end. The presence of longshore currents caused by waves approaching

9720-562: The racial composition of Maine's population as of 2016. According to the 2016 American Community Survey , 1.5% of Maine's population were of Hispanic or Latino origin (of any race): Mexican (0.4%), Puerto Rican (0.4%), Cuban (0.1%), and other Hispanic or Latino origin (0.6%). The six largest ancestry groups were: English (20.7%), Irish (17.3%), French (15.7%), German (8.1%), American (7.8%) and French Canadian (7.7%). People citing that they are American are of overwhelmingly English descent, but have ancestry that has been in

9828-538: The region for so long (often since the 17th century) that they choose to identify simply as Americans. Maine has the highest percentage of French Americans of any state. Most of them are of Canadian origin, but in some cases have been living there since prior to the American Revolutionary War . There are particularly high concentrations in the northern part of Maine in Aroostook County , which

9936-512: The sand into one location. In 1845 the Frenchman Elie de Beaumont published an account of barrier formation. He believed that waves moving into shallow water churned up sand, which was deposited in the form of a submarine bar when the waves broke and lost much of their energy. As the bars developed vertically, they gradually rose above sea level, forming barrier islands. Several barrier islands have been observed forming by this process along

10044-406: The sand is medium-grained, with shell pieces common. Since wave action is heavier, bioturbation is not likely. The lower shoreface is constantly affected by wave action. This results in development of herringbone sedimentary structures because of the constant differing flow of waves. The sand is coarser. The foreshore is the area on land between high and low tide. Like the upper shoreface, it

10152-484: The sea has been summed up by American poet Edna St. Vincent Millay of Rockland and Camden , in "Renascence": All I could see from where I stood Was three long mountains and a wood; I turned and looked the other way, And saw three islands in a bay. Geologists describe this type of landscape as a "drowned coast", where a rising sea level has invaded former land features, creating bays out of valleys and islands out of mountain tops. A rise in land elevation due to

10260-599: The site of the earliest European discovery in the entire US. About 200 years earlier, from the settlements in Iceland and Greenland , the Norse first identified America and attempted to settle areas such as Newfoundland , but failed to establish a permanent settlement. Archeological evidence suggests that Vikings in Greenland returned to North America for several centuries after the initial discovery to trade and collect timber, with

10368-469: The southern coast to overnight lows averaging below 0 °F (−18 °C) in the far north. The state's record high temperature is 105 °F (41 °C), set in July 1911, at North Bridgton. Precipitation in Maine is evenly distributed year-round, but with a slight summer maximum in northern/northwestern Maine and a slight late-fall or early-winter maximum along the coast due to " nor'easters " or intense cold-season rain and snowstorms. In coastal Maine,

10476-404: The southern terminus of the new International Appalachian Trail which, when complete, will run to Belle Isle , Newfoundland and Labrador . Machias Seal Island and North Rock , off the state's Downeast coast, are claimed by both Canada and the Maine town of Cutler , and are within one of four areas between the two countries whose sovereignty is still in dispute , but it is the only one of

10584-403: The southwestern interior portion of the state, where summer temperatures are often the warmest and the atmosphere is thus more unstable compared to northern and coastal areas. Maine rarely sees the direct landfall of tropical cyclones , as they tend to recurve out to sea or are rapidly weakening by the time they reach the cooler waters of Maine. In January 2009, a new record low temperature for

10692-625: The state of Maine. The Plymouth Company established the first English settlement in Maine at the Popham Colony in 1607, the same year as the settlement at Jamestown, Virginia . The Popham colonists returned to Britain after 14 months. The French established two Jesuit missions: one on Penobscot Bay in 1609, and the other on Mount Desert Island in 1613. The same year, Claude de La Tour established Castine . In 1625, Charles de Saint-Étienne de la Tour erected Fort Pentagouet to protect Castine. The coastal areas of eastern Maine first became

10800-438: The state the largest producer of lobster in the United States. The U.S. Census Bureau estimates that the population of Maine was 1,344,212 on July 1, 2019, a 1.19% increase since the 2010 United States census . At the 2020 census , 1,362,359 people lived in the state. The state's population density is 41.3 people per square mile, making it the least densely populated state east of the Mississippi River . As of 2010, Maine

10908-605: The state was set at Big Black River of −50 °F (−46 °C), tying the New England record. Annual precipitation varies from 35.8 in (909 mm) in Presque Isle to 56.7 in (1,441 mm) in Acadia National Park. Maine exhibits a diverse range of flora and fauna across its varied landscapes, including forests, coastline, and wetlands. Forested areas consist primarily of coniferous and deciduous trees, such as balsam fir , sugar maple , and its state tree,

11016-703: The surroundings. They are typically rich habitats for a variety of flora and fauna. Without barrier islands, these wetlands could not exist; they would be destroyed by daily ocean waves and tides as well as ocean storm events. One of the most prominent examples is the Louisiana barrier islands . Breakwater (structure) A breakwater is a permanent structure constructed at a coastal area to protect against tides, currents, waves, and storm surges. Breakwaters have been built since antiquity to protect anchorages , helping isolate vessels from marine hazards such as wind-driven waves. A breakwater, also known in some contexts as

11124-436: The war and refused to defend Maine from British invaders. In 1819, Massachusetts agreed to permit secession, sanctioned by voters of the rapidly growing region the following year. Formal secession from Massachusetts and admission of Maine as the 23rd state occurred on March 15, 1820, as part of the Missouri Compromise , which geographically restricted the spread of slavery and enabled the admission to statehood of Missouri

11232-526: The water is still, which allows fine silts, sands, and mud to settle out. Lagoons can become host to an anaerobic environment. This will allow high amounts of organic-rich mud to form. Vegetation is also common. Barrier Islands can be observed on every continent on Earth, except Antarctica. They occur primarily in areas that are tectonically stable , such as "trailing edge coasts" facing (moving away from) ocean ridges formed by divergent boundaries of tectonic plates, and around smaller marine basins such as

11340-540: Was also the most rural state in the Union, with only 38.7% of the state's population living within urban areas. As explained in detail under "Geography", there are large tracts of uninhabited land in some remote parts of the interior of the state, particularly in the North Maine Woods . The mean population center of Maine is located in Kennebec County , just east of Augusta. The Greater Portland metropolitan area

11448-602: Was much fought over by the French , English, and allied natives during the 17th and 18th centuries. These natives conducted raids against settlers and each other, taking captives for ransom or, in some cases, kidnapped for adoption by Native American tribes. A notable example was the early 1692 Abenaki raid on York , where about 100 English settlers were killed and another estimated 80 taken hostage. The Abenaki took captives taken during raids of Massachusetts in Queen Anne's War of

11556-521: Was physically separate from the rest of Massachusetts. Longstanding disagreements over land speculation and settlements led to Maine residents and their allies in Massachusetts proper forcing an 1807 vote in the Massachusetts Assembly on permitting Maine to secede; the vote failed. Secessionist sentiment in Maine was stoked during the War of 1812 when Massachusetts pro-British merchants opposed

11664-505: Was unified as York County, Massachusetts under a 1691 royal patent for the Province of Massachusetts Bay . Central Maine was formerly inhabited by the Androscoggin tribe of the Abenaki nation , also known as Arosaguntacook. They were driven out of the area in 1690 during King William's War . They were relocated to St. Francis , Canada, which was destroyed by Rogers' Rangers in 1759, and

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