黔北浒洋水侵蚀性次降雨对地表径流产沙的影响

发布时间：2018-07-22 10:56

【摘要】：为研究黔北小流域侵蚀性降雨与产沙的关系,以遵义浒洋水水土保持监测站2009—2012年降雨实测资料为基础,在4个径流小区各28场降雨的降雨量、降雨强度、最大30 min雨强、降雨侵蚀模数等数据统计的基础上,采用次降雨侵蚀力、覆盖度的回归模型及多元非线性回归方法,分析浒洋水小流域的次降雨径流侵蚀产沙规律。结果表明:流域内5—7月份总径流量、总产沙量分别占全年总量的64.05%和62.62%。当次降雨侵蚀力20,降雨侵蚀模数与降雨侵蚀力呈幂函数正相关关系,降雨侵蚀模数与覆盖度呈二次函数负相关关系;当降雨侵蚀力20,降雨侵蚀模数与降雨侵蚀力呈一次函数正相关关系,降雨侵蚀模数与覆盖度呈幂函数负相关关系。通过二元非线性回归,建立并验证次降雨侵蚀力、覆盖度与降雨侵蚀模数之间的适用公式。
[Abstract]:In order to study the relationship between erosive rainfall and sediment yield in a small watershed in northern Guizhou, based on the observed rainfall data of water and soil conservation monitoring station of Huyang in Zunyi from 2009 to 2012, the rainfall intensity and rainfall intensity of 28 rainfall events in each of the four runoff plots were studied, and the maximum rainfall intensity was 30 min. Based on the statistics of rainfall erosion modulus and other data, the regression model of secondary rainfall erosivity and coverage and the multivariate nonlinear regression method are used to analyze the runoff erosion and sediment yield law of Huyang small watershed. The results showed that the total runoff and sediment yield in May to July accounted for 64.05% and 62.62% of the whole year respectively. When rainfall erosivity is 20, rainfall erosion modulus is positively correlated with rainfall erosivity, and rainfall erosion modulus is negatively correlated with coverage. When rainfall erosivity is 20, rainfall erosion modulus is positively correlated with rainfall erosivity, and rainfall erosion modulus is negatively correlated with coverage. By means of binary nonlinear regression, the applicable formulas between rainfall erosivity, coverage and rainfall erosion modulus are established and verified.
【作者单位】：贵州大学林学院;贵州省水土保持监测中心;
【基金】：贵州省喀斯特生态与环境专业学位研究生工作站项目(黔教研合JYSZ字[2014]003)资助贵州省水利厅水利科技经费项目(KT201311)资助;贵州省水利厅水利科技经费项目(KT201202)资助
【分类号】：S157

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