Research On Rainfall Erosivity In Fuxin Region

Rainfall erosivity refers to the potential ability of soil erosion caused by rainfall,and it is one of the most important factors affecting soil erosion.The research of rainfall erosivity has important guiding significance for soil erosion quantitative prediction,soil and water conservation planning and other comprehensive control projects of soil erosion in FuXin Region.Based on the daily rainfall data of 37 weather stations in and around FuXin Region from 1980 to 2015,the first researching on rainfall characteristics of time and space,and then selecting the suitable Wen-Bo Zhang,s daily rainfall modified model for FuXin Region to calculate rainfall erosivity,The quantitative characteristics of rainfall erosivity,such as mean value,variance and coefficient of variation,were analyzed in FuXin Region,and use Kolmogorov-Smirnov tests the normal distribution characteristics,and use GS+ to analysis half variant function,select the optimal model,On these basis,the spatial interpolation method suitable for FuXin Region was selected to analyze the spatial and temporal distribution of rainfall erosivity.Finally,the relationship between rainfall and rainfall erosivity was analyzed,and the regression equation was established.The research conclusions are as follows:1?In time,the rainfall in the study area presented a single-peak distribution pattern,which increased gradually from January to July,but decreased gradually from August to December,which was consistent with the precipitation characteristics in most areas of northern China.In pace,there is a general law of increasing from northwest to southeast.2?Under the Geostatistieal Aalysis module of ArcGIS10.0,it adopts Ordinary-Kriging,Simple-Kriging and Universal-Kriging for interpolation of rainfall erosivity,and adopts cross-validation method to select the optimal spatial interpolation method.The analysis shows that for FuXin Region,the most suitable Universal-Kriging interpolation method is selected for fitting.3?In time,the rainfall erosivity in the study area presented a single-peak distribution pattern,which increased gradually from January to July,but decreased gradually from August to December.In pace,there is a general law of increasing from northwest to southeast.4?The variation rule of rainfall erosivity and rainfall amount are basically the same in FuXin Region,and the trend of curve is basically the same.In this study,the annual rainfall was taken as the independent variable,and the rainfall erosivity was taken as the dependent variable for linear regression,and the regression equation fitting rainfall erosivity and precipitation was obtained.This paper has 16 figures,10 tables and 71 references.