Geomorphic considerations for erosion prediction |
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| Authors: | W R Osterkamp T J Toy |
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| Institution: | (1) U.S. Geological Survey, 1675 W. Anklam Road, Tuson, AZ 85745, USA, US |
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| Abstract: | Current soil-erosion prediction technology addresses processes of rainsplash, overland-flow sediment transport, and rill
erosion in small watersheds. The effects of factors determining sediment yield from larger-scale drainage basins, in which
sediment movement is controlled by the combined small-scale processes and a complex set of channel and other basin-scale sediment-delivery
processes, such as soil creep, bioturbation, and accelerated erosion due to denudation of vegetation, have been poorly evaluated.
General suggestions are provided for the development of erosion-prediction technology at the geomorphic or drainage-basin
scale based on the separation of sediment-yield data for channel and geomorphic processes from those of field-scale soil loss.
An emerging technology must consider: (1) the effects on sediment yield of climate, geology and soils, topography, biotic
interactions with other soil processes, and land-use practices; (2) all processes of sediment delivery to a channel system;
and (3) the general tendency in most drainage basins for progressively greater sediment storage in the downstream direction.
Received: 8 November 1995 · Accepted: 20 November 1995 |
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| Keywords: | Erosion prediction Sediment delivery Scale dependency Geomorphic processes |
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