Landscapes and Geomorphology: A Very Short Introduction by Goudie Andrew & Viles Heather

Author:Goudie, Andrew & Viles, Heather [Viles, Heather]
Language: zho
Format: epub
Tags: #genre
Publisher: OUP Oxford
Published: 2010-08-25T16:00:00+00:00

One landform created almost entirely from dead material is the log jam, in which rivers become completely dammed or partially blocked by logs (better known as ‘large woody debris’, or LWD). Dead wood falls into streams and rivers as a result of death or disease, or perhaps mass movements, fluvial erosion of riparian trees, or even animal attack. This dead wood accumulates, and then other sediment and debris builds up behind it. One extreme example of this process occurred on the northern Red River in Louisiana, before European settlement. Over at least a 200-year period, a series of log jams affected a 260-kilometre-long section of the river, with the jams accumulating into a huge log raft and producing a whole series of lakes. The log raft was gradually removed during the 19th century by river steamers with heavy cranes and the lakes were drained.

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