In
geography, a confluence (also: conflux) occurs where two or more
watercourses join to form a single
channel.[1] 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 at
Pittsburgh, forming the
Ohio); or where two separated channels of a river (forming a
river island) rejoin at the downstream end.
Scientific study of confluences
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.[2] The water flows and their consequences are often studied with
mathematical models.[3] Confluences are relevant to 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."[4]
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 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."[5]
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 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.[6]
River confluence flow zones
Hydrodynamic behaviour of flow in a confluence can be divided into six distinct features[7] which are commonly called confluence flow zones (CFZ). These include
Stagnation zone
Flow deflection zone
Flow separation zone / recirculation zone
Maximum velocity zone
Flow recovery zone
Shear layers
Confluences in engineering
The broader field of engineering encompasses a vast assortment of subjects which concern confluences.
Engineers have to design these systems whilst considering a list of factors that ensure 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.[9][10]The velocities and hydraulic efficiencies should be meticulously calculated and can be altered by integrating different combinations of geometries, components such 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.[11]
Confluences and humankind
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 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, 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.[12] Pre-Christian
Slavic peoples chose confluences as the sites for fortified triangular temples, where they practiced human sacrifice and other sacred rites.[13] In
Hinduism, the confluence of two sacred rivers often is a pilgrimage site for ritual bathing.[14] In Pittsburgh, a number of adherents to
Mayanism consider their city's confluence to be sacred.[15]
At
Kazungula in
Zambia, the
Chobe River flows into the
Zambezi. The confluence defines the
tripoint of
Zambia (north of the rivers),
Botswana (south of the rivers) and
Namibia (west of the rivers). The land border between Botswana and
Zimbabwe to the east also reaches the Zambezi at this confluence, so there is a second tripoint (Zambia-Botswana-Zimbabwe) only 150 meters downstream from the first. See
Kazungula and
Quadripoint, and Gallery below for image.
The Sudanese capital of
Khartoum is located at the confluence of the
White Nile and the
Blue Nile, the beginning of the
Nile.
Near
Allahabad, India, the
Yamuna flows into the Ganges. In
Hinduism, this is a pilgrimage site for ritual bathing;[17] during a
Kumbh Mela event tens of millions of people visit the site. In Hindu belief the site is held to be a triple confluence (
Triveni Sangam), the third river being the metaphysical (not physically present)
Sarasvati.[18]
Karad, in
Maharashtra,
India, is the site of the
Pritisangam (meaning: Lovely Confluence), a T-shaped confluence of
Krishna River and
Koyna River, where Koyna River mergers into Krishna River forming a T-shape and then the merged rivers flow to the east as Krishna River.[19]
Kuala Lumpur, the capital of
Malaysia, is where the
Gombak River (previously known as Sungai Lumpur, which means "muddy river") flows into the
Klang River at the site of the
Jamek Mosque. Recently, the Kolam Biru (Blue Pool), a pool with elaborate fountains, has been installed at the apex of the confluence.[20]
The
Jialing flows into the
Yangtze at
Chongqing in
China. The confluence forms a focal point in the city, marked by Chaotianmen Square, built in 1998.
In the Far East, the
Amur forms the international boundary between China and
Russia. The
Ussuri, which also demarcates the border, flows into the Amur at a point midway between
Fuyuan in China and
Khabarovsk in Russia. The apex of the confluence is located in a rural area, part of China, where a commemorative park, Dongji Square, has been built; it features an enormous sculpture representing the Chinese character for "East".[21] The Amur-Ussuri border region was the location of the
Sino-Soviet border conflict of 1969; the borderline near the confluence was settled peacefully by treaty in 2008.
In
Georgia, in the town of
Pasanauri on the southern slopes of the
Caucasus Mountains, the Tetri Aragvi ("White Aragvi") is joined by the Shavi Aragvi ("Black Aragvi"). Together, these two rivers continue as the
Aragvi River. The conflux is known for its dramatic visual contrast of the two rivers.
The
Seine divides in the historical center of
Paris, flowing around two river islands, the
Île Saint-Louis and the
Île de la Cité. At the downstream confluence, where the river becomes a single channel again, the Île de la Cité is crossed by the famous
Pont Neuf, adjacent to an equestrian statue of King
Henri IV and the historically more recent Vert Galant park. The site has repeatedly been portrayed by artists including
Monet,
Renoir, and
Pissarro.
Further upstream, the
Marne empties into the Seine at
Charenton-le-Pont and
Alfortville, just southeast of the Paris city limits. The site is dominated by the
Huatian Chinagora, a four-star hotel under Chinese management.
The
Main flows into the Rhine just south of
Mainz.
The
Mosel flows into the Rhine further north at
Koblenz. The name "Koblenz" itself has its origin in the Latin name "Confluentes". In German, this confluence is known as the "
Deutsches Eck" ("German corner") and is the site of an imposing monument to German unification featuring an equestrian statue of
Kaiser Wilhelm I.
Upstream in
Switzerland, a small town also named
Koblenz (for the same reason) is where the
Aare joins the Rhine.
Danube basin
Passau, Germany, sometimes called the Dreiflüssestadt (City of Three Rivers), is the site of a triple confluence, described thus in a guidebook: "from the north the little
Ilz sluices brackish water down from the
peat-rich
Bavarian Forest, meeting the cloudy brown of the
Danube as it flows from the west and the pale snow-melt jade of the
Inn from the south [i.e., the
Alps] to create a murky tricolour."[22]
The
Lusatian Neisse flows into the
Oder at a rural location in Poland opposite the German village of Ratzdorf. The two rivers form the
Oder-Neisse line, the postwar boundary of Germany and Poland.
The Greater
Twin Cities area of
Minneapolis and
St. Paul,
Minnesota features two important Mississippi confluences. Near historical
Fort Snelling and the town of
Mendota—about 9 miles downstream on the Mississippi from Minneapolis—the
Minnesota River flows into the Mississippi at
Pike Island. The area around this confluence is a location of spiritual, cultural, and historical significance to the
Dakota people and is also the site of the earliest European settlements in the Twin Cities area. About 30 miles further downstream from the Minnesota-Mississippi confluence—and 25 miles downstream from St. Paul—the Mississippi joins with the
St. Croix River near
Hastings, Minnesota, and
Prescott, Wisconsin.
The Ohio River is formed by the confluence of the
Monongahela and
Allegheny rivers, located in
Pittsburgh,
Pennsylvania. The site is of great historical significance; in the 1970s it was upgraded by the creation of
Point State Park, highlighted by a large fountain.
At
Cohoes, New York, a few miles north of
Albany, the
Mohawk River flows into the
Hudson in three channels separated by islands. The confluence is historically important: upstream traffic on or along the Hudson often took a left turn at the Mohawk, which offers a uniquely level passageway through the
Appalachian Mountains that assisted commerce and the settlement of the West.
At
Ottawa, the capital of Canada, the
Rideau River flows—unusually, as a waterfall—into the
Ottawa River; see
Rideau Falls. On the island separating the two portions of the falls is a park with military monuments, among them the
Ottawa Memorial.
The
Snake River flows into the
Columbia River at Sacagawea State park near the
Tri-Cities of
Washington. It should also be noted that the significant Yakima river also flows into the Columbia just a few miles upstream, thus giving the region the unofficial preposition of Three Rivers
Look up confluence in Wiktionary, the free dictionary.
The term confluence can also apply to the process of merging or flowing together of other substance.[28] For example, it may refer to the merger of the flow of two
glaciers.[29]
Wikimedia Commons has media related to Confluences.
See also
River mouth – End of a river where it flows into a larger body of water
^A widely cited work is James L. Best (1986) The morphology of river channel confluences. Progress in Physical Geography 10:157–174. For work citing Best, see
[1].
^A recent contribution with review of earlier work is Laurent Schindfessel, Stéphan Creëlle and Tom De Mulder (2015) "Flow patterns in an open channel confluence with increasingly dominant tributary inflow," Water 7: 4724–4751; available on line.
^Quoted from Beechie et al. (2012), who cite earlier work. Tim Beechie, John S. Richardson,
Angela M. Gurnell, and Junjiro Negishi (2012) "Watershed processes, human impacts, and process-based restoration." In Philip Roni and Tim Beechie (eds.) (2012) Stream and Watershed Restoration: A Guide to Restoring Riverine Processes and Habitats, John Wiley & Sons. Excerpts available on line at Google Books.
^U.S. Geological Survey, "How do contaminants mix at the confluence of two streams?", on line at
[2]Archived 2021-03-28 at the
Wayback Machine.
^David Lynch (2014) "The Confluence of Rivers"; Earth Science Picture of the Day, at
[3].
^Best, James L. (1987). "Flow Dynamics at River Channel Confluences: Implications for Sediment Transport and Bed Morphology". Recent Developments in Fluvial Sedimentology. pp. 27–35.
doi:
10.2110/pec.87.39.0027.
ISBN978-0-918985-67-5.
^Moore, I.D.; García, D. Becerril; Sezen, H.; Sheldon, T. (2012-07-20).
Structural Design of Culvert Joints. National Cooperative Highway Research Program, Transportation Research Board, National Academies of Sciences, Engineering, and Medicine. Washington, D.C.: Transportation Research Board.
ISBN978-0-309-43495-9.
^Rogers, Adam (2011) Late Roman Towns in Britain: Rethinking Change and Decline. Cambridge: Cambridge University Press, p. 42. Excerpts available on line at Google Books.
^Gasparini, Evel (n.d.) "Slavic religion", in Encyclopedia Britannica, on line edition:
[4]
^Source: Letizia (2017), who writes, "as rivers are considered holy entities, at the meeting of two streams the 'sacredness' of the first river add to that of the second one. The confluence seems to have a sort of 'additive fame' ... because it gives pilgrims the chance to bathe in two rivers at the same time."
^Ann Rodgers, "So how did the Point get on a Mayan calendar?", Pittsburgh Post-Gazette, June 22, 2008. On line at
[5].
^See New Straits Times, August 28, 2017, 'Najib launches River of Life, Blue Pool projects", at
[8].
^See Bruno Maçães, "Signs and Symbols on the Sino-Russian Border", published in The Diplomat. On line at
[9].
^See Andrea Schulte-Peevers, Kerry Christiani, Marc Di Duca, Catherine Le Nevez, Tom Masters, Ryan Ver Berkmoes, and Benedict Walker (2016) Lonely Planet Germany, Lonely Planet Publishing. Excerpts posted on line at Google Books:
[10]
^Kogovšek, Janja; Petrič, Metka; Zupan Hajna, Nadja; Pipan, Tanja.
"Planinska jama" [Planina Cave]. In Šmid Hribar, Mateja; Golež, Gregor; Podjed, Dan; Kladnik, Drago; Erhartič, Bojan; Pavlin, Primož; Ines, Jerele (eds.). Enciklopedija naravne in kulturne dediščine na Slovenskem [Encyclopedia of Natural and Cultural Heritage in Slovenia] (in Slovenian). Archived from
the original on 19 April 2012. Retrieved 17 May 2012.
^Engineers in New Orleans refer to the confluence of the 17th Street Canal and Lake Pontchartrain. See:
"Interim Closure Structure at 17th St. Canal". Task Force Guardian. Archived from
the original on 2006-06-25. Retrieved 2006-03-11.
^Vladimir Kotlyakov and Anna Komarova (2006) Elsevier's Dictionary of Geography: in English, Russian, French, Spanish and German. Elsevier. Passage cited may be accessed on
Google Books.
References
Letizia, Chiara (2017) "The Sacred Confluence, between Nature and Culture," in Marie Lecomte-Tilouine (ed.) Nature, Culture and Religion at the Crossroads of Asia. Routledge. Extracts available on line at Google Books.
External links
[11] A collection of full-size, vivid photographs of confluences, most of them mentioned in the list above.