Aerial photograph of and incised meander. This last cause leads to incised meanders (12).įigure 12. Or the land in which the stream flows uplifted.A modification in the base level made the stream to erode in a vertical way (over a horizontal way). How are there shapes formed? Originally, it is probable that the meanders were developed in the floodplain which was relatively close to the base level (the lower limit of an erosional process). Normally, we would expect a water stream with a high sinuosity to be found in a floodplain and a wide valley, but some rivers exhibit meandered stream beds which flow in narrow and high sloped valleys. Floodplain and its erosional and depositional landforms. They are often formed during the creation of oxbow lakes.įigure 10. They are characterized by “a crescentic cut in a bluff or valley wall, produced by a meandering stream. They are formed by the remnants of a meandering water channel. When several processes of erosion, transport, deposition and migration of meanders occur, they are formed meander scars (10).The word “oxbow” can also refer to a U-shaped bend in a river or stream, whether or not it is cut off from the main stream. Evolution of a meander and an oxbow lake. They are crescent-shaped and located on the inside of a stream bend, being very similar to, though often smaller than, towheads, or river islands.įigure 9. Point bars are found in abundance in mature or meandering streams.
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