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This sediment is responsible for building the delta and allowing it to advance into the sea. As it extends further offshore, the channel slope will decrease and its bed will aggrade, promoting an avulsion. In sedimentary geology and fluvial geomorphology, avulsion is the rapid abandonment of a river channel and the formation of a new river ...
The opposite of transgression is regression where the sea level falls relative to the land and exposes the former sea bottom. During the Pleistocene Ice Age , so much water was removed from the oceans and stored on land as year-round glaciers that the ocean regressed 120 m, exposing the Bering land bridge between Alaska and Asia.
At the height of the last ice age, around 18,000 years ago, the global sea level was 120 to 130 m (390-425 ft) lower than today. A cold spell around 6 million years ago was linked to an advance in glaciation, a marine regression, and the start of the Messinian salinity crisis in the Mediterranean basin.
Avulsion fracture, when a fragment of bone tears away from the main mass of bone as a result of physical trauma; Avulsion injury, in which a body structure is detached from its normal point of insertion, either torn away by trauma or cut by surgery; Avulsion (legal term), the sudden loss of land by the action of water
The distinction between avulsion and accretion becomes important if a river forms the boundary between two riparian owners. In many jurisdictions, if the river changes channels by avulsion, the boundary does not change but remains in the middle of the old channel.
The most recent avulsion, initiated in the 1870s, had profound effects on the physiography and ecosystems in the northwestern region of the delta. [ 5 ] [ 10 ] For example, Cumberland Lake , the largest lake in the SRD, has become shallower – from pre-avulsion depths of over 6 metres (20 ft) to average depths of less than 1.5 metres (4 ft 11 ...
Beach evolution is a natural process occurring along shorelines where sea, lake or river water erodes the land. Beaches form as sand accumulates over centuries through recurrent processes that erode rocky and sedimentary material into sand deposits.
The deeply indented shape of the ria reflects the dendritic pattern of drainage that existed before the rise in sea level that flooded the valley. A ria (/ ˈ r iː ə /; [1] Galician: ría, feminine noun derived from río, river) is a coastal inlet formed by the partial submergence of an unglaciated river valley. It is a drowned river valley ...