Response Research on the Relationship between Depositing Sediment and Erosive Rainfall Based on Grey Correlation Analysis
基于灰关联的坝地分层淤积量与侵蚀性降雨响应研究

By comprehensive investigating check dams,digging soil profiles of typical check dams, measuring the thickness of each alluvium and using reservoir storage-capacity curve,the depositing sediment of each alluvium for typical check dams was obtained.Based on the theory of sediment yields produced by storm and rainfall data in depositing process,the reversal of the corresponding erosive rainfall of each depositing sediment layer was obtained.The correlations between the depositing sediment and indexes of erosive rainfall including the maximum rainfall intensity in 30 minutes (I30),rainfall amount (P),rainfall erosivity (R) and average rainfall intensity (I) are studied in the paper.The result shows that the correlation degree between rainfall erosivity(R) and depositing sediment is the highest,and the second highest is rainfall amount(P).The relationships among depositing sediment and rainfall intensity in 30 minutes (I30),the average rainfall intensity (I) are lower.The relationships among depositing sediment and rainfall erosivity(R),rainfall amount(P) were established as dualistic linear regression equation in the paper.