Misplaced Pages

#778221

22-455: Nesbit is near the confluence of the Glen and Till rivers and the hypothesized location of one of King Arthur 's battles against invading Anglo-Saxons . Latin documentation dating to 1242 lists "Dodington cum Nesebit membro suo" (Doddington with its member Nesbit) as among the holdings of Baron William de Vesci. In 1346, Edward III granted land at Nesbit to Thomas Grey (or Gray) of Heaton after

44-539: A confluence (also: conflux ) occurs where two or more watercourses join to form a single channel . A confluence can occur in several configurations: at the point where a tributary joins a larger river ( main stem ); or where two streams meet to become the source of a river of a new name (such as the confluence of the Monongahela and Allegheny rivers, forming the Ohio River ); or where two separated channels of

66-619: A confluence is an industrial site, as in Philadelphia or Mannheim . Often a confluence lies in the shared floodplain of the two rivers and nothing is built on it, for example at Manaus , described below. One other way that confluences may be exploited by humans is as sacred places in religions . Rogers suggests that for the ancient peoples of the Iron Age in northwest Europe, watery locations were often sacred, especially sources and confluences. Pre-Christian Slavic peoples chose confluences as

88-433: A gradients, cascades and an adequate junction angle which is sympathetic to the direction of the watercourse’s flow to minimise turbulent flow, maximise evacuation velocity and to ultimately maximise hydraulic efficiency. Since rivers often serve as political boundaries, confluences sometimes demarcate three abutting political entities, such as nations, states, or provinces, forming a tripoint . Various examples are found in

110-479: A river (forming a river island ) rejoin at the downstream end. The point of confluence where the channel flows into a larger body of water may be called the river mouth . Confluences are studied in a variety of sciences. Hydrology studies the characteristic flow patterns of confluences and how they give rise to patterns of erosion, bars, and scour pools. The water flows and their consequences are often studied with mathematical models . Confluences are relevant to

132-441: A stream contaminated with acid mine drainage combines with a stream with near-neutral pH water; these reactions happen very rapidly and influence the subsequent transport of metals downstream of the mixing zone." A natural phenomenon at confluences that is obvious even to casual observers is a difference in color between the two streams; see images in this article for several examples. According to Lynch, "the color of each river

154-401: A vast assortment of subjects which concern confluences. In hydraulic civil engineering , where two or more underground culverted / artificially buried watercourses intersect, great attention should be paid to the hydrodynamic aspects of the system to ensure the longevity and efficiency of the structure. Engineers have to design these systems whilst considering a list of factors that ensure

176-494: Is determined by many things: type and amount of vegetation in the watershed, geological properties, dissolved chemicals, sediments and biologic content – usually algae ." Lynch also notes that color differences can persist for miles downstream before they finally blend completely. Hydrodynamic behaviour of flow in a confluence can be divided into six distinct features which are commonly called confluence flow zones (CFZ). These include The broader field of engineering encompasses

198-735: Is used to describe the meeting of tidal or other non-riverine bodies of water, such as two canals or a canal and a lake. A one-mile (1.6 km) portion of the Industrial Canal in New Orleans accommodates the Gulf Intracoastal Waterway and the Mississippi River-Gulf Outlet Canal ; therefore those three waterways are confluent there. The term confluence can also apply to the process of merging or flowing together of other substance. For example, it may refer to

220-462: The South Pole in a point of elevenfold complexity, though this is an example of points subject to dispute . International tripoints include: Some historic tripoints: While the exact line of an international border is normally fixed by a bilateral treaty, the position of the tripoints may need to be settled by a trilateral agreement. For example, China, Russia, and Mongolia have set the position of

242-501: The territorial waters ), and the same goes for countries with their only neighbour country, such as Portugal or Lesotho . Landlocked countries also have international tripoints. Likewise, the United States with two neighbouring countries has no international tripoints; however, it has a number of state tripoints as well as one point where four states meet . Indonesia has no international tripoints, just like Australia, Japan and

SECTION 10

#1733084571779

264-510: The United States. Canada , as well, which has a maritime border with two other countries, has no international tripoints; however, it has five tripoints on land where the boundaries of provinces and territories meet, and one quadripoint where four provinces and territories meet . Japan has multiple prefectural tripoints; it also has prefectural quadripoints. In addition to the United States, Canada and Indonesia, Australia also has tripoints where

286-424: The boundaries of states meet. Border junctions (or "multiple points" or "multipoints" as they are also sometimes called) are most commonly threefold. There are also a number of quadripoints , and a handful of fivefold points, as well as unique examples of sixfold, sevenfold, and eightfold points (see quadripoint § Multipoints of greater numerical complexity ). The territorial claims of six countries converge at

308-440: The discharge point is structurally stable as the entrance of the lateral culvert into the main structure may compromise the stability of the structure due to the lack of support at the discharge, this often constitutes additional supports in the form of structural bracing. The velocities and hydraulic efficiencies should be meticulously calculated and can be altered by integrating different combinations of geometries, components such

330-499: The distribution of living organisms (i.e., ecology ) as well; "the general pattern [downstream of confluences] of increasing stream flow and decreasing slopes drives a corresponding shift in habitat characteristics." Another science relevant to the study of confluences is chemistry , because sometimes the mixing of the waters of two streams triggers a chemical reaction, particularly in a polluted stream. The United States Geological Survey gives an example: "chemical changes occur when

352-553: The list below. A number of major cities, such as Chongqing , St. Louis , and Khartoum , arose at confluences; further examples appear in the list. Within a city, a confluence often forms a visually prominent point, so that confluences are sometimes chosen as the site of prominent public buildings or monuments, as in Koblenz , Lyon , and Winnipeg . Cities also often build parks at confluences, sometimes as projects of municipal improvement, as at Portland and Pittsburgh . In other cases,

374-475: The merger of the flow of two glaciers . Tripoint A triple border , tripoint , trijunction , triple point , or tri-border area is a geographical point at which the boundaries of three countries or subnational entities meet. There are 175 international tripoints as of 2020. Nearly half are situated in rivers, lakes or seas. On dry land, the exact tripoints may be indicated by markers or pillars, and occasionally by larger monuments. Usually,

396-779: The more neighbours a country has, the more international tripoints that country has. China with 16 international tripoints and Russia with 11 to 14 lead the list of states by number of international tripoints. Other countries, like Brazil , India , and Algeria , have several international tripoints. Argentina has four international tripoints. South Africa , Pakistan and Nigeria have three international tripoints while Bangladesh and Mexico have only one. Within Europe, landlocked Austria has nine tripoints, among them two with Switzerland and Liechtenstein . Island countries , such as Japan and Australia , have no international tripoints (some, like Bahrain and Singapore , have tripoints in

418-498: The rebellion of the previous holder, John de Trollope. Documents note the existence in 1415 of a defensive tower at Nesbit belonging to his grandson, Thomas Grey . However, in a 1541 survey it was observed that: During the 19th century, the township was productive farmland supporting a small community of workers. An 1855 survey of Northumberland reports as follows. Nesbit was formerly a township in Doddington parish, from 1866 Nesbit

440-448: The sites for fortified triangular temples, where they practiced human sacrifice and other sacred rites. In Hinduism , the confluence of two sacred rivers often is a pilgrimage site for ritual bathing. In Pittsburgh, a number of adherents to Mayanism consider their city's confluence to be sacred. Mississippi basin Atlantic watersheds Pacific watersheds Occasionally, "confluence"

462-622: The two relevant tripoints (the junction points of the China–Russia border , the Mongolia–Russia border , and the China–Mongolia border ) by the trilateral agreement signed in Ulaanbaatar on January 27, 1994. The agreement specified that a marker was to be erected at the eastern tripoint, called Tarvagan Dakh (Tarbagan Dakha), but that no marker would be erected at the western tripoint (which

SECTION 20

#1733084571779

484-406: Was a civil parish in its own right until it was abolished on 1 April 1955 and merged with Doddington. Today, Nesbit is the site of a sheep farm with no visible trace of the medieval tower or village. Dodds, M. H. (1935). A history of Northumberland vol 14, Newcastle upon Tyne, 178. Hodgson, J. C. (1916). Archaeologia Aeliana 3rd Series, 3, 6. Confluence (geography) In geography ,

#778221