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A floodplain or flood plain or bottomlands [1] is an area of land adjacent to a river. Floodplains stretch from the banks of a river channel to the base of the enclosing valley, and experience flooding during periods of high discharge. [2] The soils usually consist of clays, silts, sands, and gravels deposited during floods. [3]
Observations made on long geologic times scales (≥10 6 annum) typically reveal much about slower, larger-magnitude geologic processes such as tectonism [5] from a regional to even global scale. Evaluation on geologically short time scales (10 3 -10 5 a ) can reveal much about the relatively shorter climatic cycles, [ 5 ] local to regional ...
The difference between a flood plain and an alluvial plain is: a flood plain represents areas experiencing flooding fairly regularly in the present or recently, whereas an alluvial plain includes areas where a flood plain is now and used to be, or areas which only experience flooding a few times a century. [8] Chengdu Plain, Sichuan
An alluvial plain is a plain (an essentially flat landform) created by the deposition of sediment over a long period by one or more rivers coming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smaller area over which the rivers flood at a particular time. In contrast, the alluvial plain is ...
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In geology, a backswamp is a type of depositional environment commonly found in a floodplain. It is where deposits of fine silts and clays settle after a flood . These deposits create a marsh-like landscape that is often poorly drained and usually lower than the rest of the floodplain.
Crevasse splay on the Columbia River ().1ː Levees; 2ː active channel; 3ː floodplain; 4ː crevasse splay deposits; 5ː crevasse splay extent. A crevasse splay is a sedimentary fluvial deposit which forms when a stream breaks its natural or artificial levees and deposits sediment on a floodplain.
The American Bottom region is bordered by tall bluffs such as this one, rising near Dupo, Illinois.This waterfall is called Falling Springs. The American Bottom is the flood plain of the Mississippi River in the Metro East region of Southern Illinois, extending from Alton, Illinois, south to the Kaskaskia River.