基于灰关联的坝地分层淤积量与侵蚀性降雨响应研究

论文在全面调查陕北黄土高原淤地坝的基础上,选取典型淤地坝挖取剖面,进行分层测量取样,利用库容曲线和实测各淤积层的厚度求得各层泥沙淤积量,根据黄土高原暴雨产沙过程原理及淤积过程降雨资料,反演各淤积层所对应的侵蚀性降雨。运用灰色关联分析法,分析计算了坝地泥沙淤积量和侵蚀性降雨的4个指标(降雨侵蚀力R、降雨量P、最大30分钟降雨强度I30、平均降雨强度I)之间的关联度。研究结果表明:侵蚀性降雨4个指标中,降雨侵蚀力R和坝地泥沙淤积量的关系最为密切,降雨量P对淤积量的影响次之,最大30分钟降雨强度I30和平均降雨强度I对淤积量的影响最小;并且建立了坝地泥沙淤积量与降雨侵蚀力R和降雨量P的二元线性回归方程。

Response Research on the Relationship between Depositing Sediment and Erosive Rainfall Based on Grey Correlation Analysis

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.