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United States Department of Agriculture

Agricultural Research Service

Title: Effect of Sediment Load on Soil Erosion in Rills

Authors
item Merten, Gustavo - BRAZIL
item Borges, Ana - BRAZIL
item Nearing, Mark

Submitted to: International Soil Conservation Organization Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: May 23, 1999
Publication Date: N/A

Technical Abstract: An experiment was carried out in a flume (7.6 m) under laboratory conditions to study the effect of sediment load in the flow on soil detachment and deposition. The soil used in this study was a Cecil sandy loam (clayey, kaolinitic, thermic, Typic Hapludult). A flow rate of 7.3 l/min and a bed slope 5% was used. We injected increasing amounts of sediments (0, 2.1,3.9, 6.5 and 8 g/s) consisting of the same soil that was used in the bed. The results showed that the increment of sediment injected reduced the soil detachment rate and increased the deposition rate in the flume. A linear, decreasing relationship was found (r2= 0.98) between total soil detachment and the injected sediment. These results are consistent with deterministic erosion models such as WEPP, GUEST, and EUROSEM that consider the effect of sediment load on the soil detachment. However none of models could predict sediment deposition our experimental conditions.

Last Modified: 8/22/2014
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