A river may flow into another one, thus becoming its tributary. The transported rock material is then taken over by the main river. When the outlet is on the shore of a sea or lake, the river at that places loses its ability to transport sediments, and all material accumulates. When the sea (or lake) is shallow in that place, and there are no strong coastal currents or high tides, the rock material brought by the river is accumulated on the shore of the reservoir and gradually backfills the outlet, forming an alluvial fan called a deltadeltadelta.
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Determine on which continent the randomly selected river is, and into which sea or ocean it flows (tu uzupełnij).
Determine on which continent the randomly selected river is, and into which sea or ocean it flows (tu uzupełnij).
Source: licencja: CC 0.
In some places, rivers flow into a deep, open sea. In addition, strong sea currents and high tides often occur in such places. The sediments brought by the river are carried out to sea and deposited in the depths far from the shore. The outlet of the river does not become backfilled, and the riverbed expands not due to river erosion, but due to repeated falling tides and rising tides that sometimes reach far upstream. Rising and falling tides are erosive and widen the outlet, at the same time preventing accumulation of the material carried by the river. Because of their shape, in Poland they have been called funnel outletsfunnel outletfunnel outlets, and in the rest of the world – estuariesestuaryestuaries from the Latin term aestuarium which originally meant ‘seaway’. In many cases, river outlets have a form that is intermediate between a delta and an estuary.
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Exercise 1
Move the characteristic features of river outlets to the corresponding groups. river delta Możliwe odpowiedzi: 1. occurs when a river flows into a shallow lake or sea, 2. the rock material brought by the river is not accumulated on the shore of the reservoir, 3. occurs when a river flows into a deep sea, 4. has the form of two or more legs, 5. the rock material brought by the river is accumulated on the shore of the reservoir, 6. has the form of a funnel widened by sea tides, 7. is created in an area with strong coastal currents and high tides, 8. is created in an area where there is a lack of strong coastal currents and high tides estuary Możliwe odpowiedzi: 1. occurs when a river flows into a shallow lake or sea, 2. the rock material brought by the river is not accumulated on the shore of the reservoir, 3. occurs when a river flows into a deep sea, 4. has the form of two or more legs, 5. the rock material brought by the river is accumulated on the shore of the reservoir, 6. has the form of a funnel widened by sea tides, 7. is created in an area with strong coastal currents and high tides, 8. is created in an area where there is a lack of strong coastal currents and high tides
Move the characteristic features of river outlets to the corresponding groups. river delta Możliwe odpowiedzi: 1. occurs when a river flows into a shallow lake or sea, 2. the rock material brought by the river is not accumulated on the shore of the reservoir, 3. occurs when a river flows into a deep sea, 4. has the form of two or more legs, 5. the rock material brought by the river is accumulated on the shore of the reservoir, 6. has the form of a funnel widened by sea tides, 7. is created in an area with strong coastal currents and high tides, 8. is created in an area where there is a lack of strong coastal currents and high tides estuary Możliwe odpowiedzi: 1. occurs when a river flows into a shallow lake or sea, 2. the rock material brought by the river is not accumulated on the shore of the reservoir, 3. occurs when a river flows into a deep sea, 4. has the form of two or more legs, 5. the rock material brought by the river is accumulated on the shore of the reservoir, 6. has the form of a funnel widened by sea tides, 7. is created in an area with strong coastal currents and high tides, 8. is created in an area where there is a lack of strong coastal currents and high tides
Move the characteristic features of river outlets to the corresponding groups.
has the form of two or more legs, occurs when a river flows into a deep sea, is created in an area where there is a lack of strong coastal currents and high tides, is created in an area with strong coastal currents and high tides, the rock material brought by the river is accumulated on the shore of the reservoir, has the form of a funnel widened by sea tides, the rock material brought by the river is not accumulated on the shore of the reservoir, occurs when a river flows into a shallow lake or sea
estuary - poszerzone przez pływy morskie ujście rzeki uchodzącej do głębokiego morza, powstające w miejscach, w których występują silne prądy przybrzeżne