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Impact of Slope Length on Red Soil Erosion Under Simulated Rainfall
Author(s): 
Pages: 474-483
Year: Issue:  3
Journal: Journal of Basic Science and Engineering

Keyword:  red soil hilly regionsimulated rainfallsoil erosionrainfall intensityslope length;
Abstract: In order to solve soil loss issue on bare slope in red soil hilly region,this study investigated the impact of slope length on soil erosion under different rainfall intensities,the critical rainfall intensity and reasonable slope length for soil conservation by laboratory simulated rainfall( with rainfall intensity 30—150mm / h) and soil flumes( with slope length 1,2,3,4,5m,slope gradient20°). Results indicated that sediment yield increased with increasing slope length under the same rainfall intensity,relationship between them could be described by power function( Determination coefficient R2> 0. 80). The more and the quicker increase of sediment yield required the greater rainfall intensity. Increment of sediment mass was not proportional to the same slope length increase,consequently,this study suggested preliminarily that engineering measures of soil and water conservation on bare slope in red soil hilly region could be constructed at 3m intervals to truncate the slope length and decrease soil loss. Sediment yield increased with increasing rainfall intensity and it could be estimated with a power function of rainfall intensity( Determination coefficientR2= 0. 99). A quicker increase of sediment mass with increasing rainfall intensity required the longer slope length. Around 60 mm / h rainfall intensity was the critical value that resulted in sudden increase of erosion on bare slope in red soil hilly region,as a consequence,soil and water conservation measures should be strengthened when rainfall intensity is greater than 60 mm / h. There was positive correlation between sediment yield and rainfall intensity( slope length),moreover,rainfall intensity played more notable impact on sediment yield than slope length. This Study will serve to the control of soil and water loss on bare slope in red soil hilly region.
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