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[1]ZHANG Ge,LIU De-fu,SONG Lin-xu,et al.Rainfall Erosivity Characteristics and Simple Estimation Method in Xiangxi River Watershed[J].Research of Soil and Water Conservation,2013,20(05):7-12.

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Rainfall Erosivity Characteristics and Simple Estimation Method in Xiangxi River Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 20 Number of periods: 2013 05 Page number: 7-12 Column: Public date: 2013-10-28

Title:: Rainfall Erosivity Characteristics and Simple Estimation Method in Xiangxi River Watershed

Author(s):: ZHANG Ge¹, LIU De-fu^2,3, SONG Lin-xu¹, ZHU Xiao-ming¹; 1. College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China;
2. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China;
3. College of Resources and Environment Sciences, Hubei University of Technology, Wuhan 430068, China

Keywords:: daily rainfall amount; rainfall erosivity; evolution characteristics; simple algorithm model; Xiangxi River watershed

CLC:: S157.1

DOI:: -

Abstract:: Rainfall erosivity shows the potential ability of the soil loss caused by rainfall and it is very important for predicting soil loss quantitatively. A rainfall erosivity model using daily rainfall amounts to estimate half month rainfall erosivity directly was adopted to calculate the rainfall erosivity in study area by using daily rainfall data from Xingshan weather station during 1990—2009 of Xiangxi river watershed in Three Gorges Reservoir, and to analyze evolution characteristics of rainfall erosivity between year and interannual,and simple arithmetic models were established. The results show that the distribution of R in Xiangxi River Watershed mainly focused on the period from May to August, accounting for 71% of all year value, and its peak appears in July consistent with erosive rainfall. The interannual variability of R value is very large, and the coefficient of variation reaches to 0.36. Yearly average rainfall erosivity is 4 361.55 (MJ·mm)/(hm²·h). The interannual variability trend of R value is the same as the trend annual rainfall and erosive rainfall, but there are also some abnormal years. Trend coefficient of rainfall erosivity is 0.106, which is increasing. The coefficient of determination of simple arithmetic models is all over 0.9, and relative error is small, meeting requirements, which can use to study area. Due to the exact value of R unknown, the model parameters will be further optimized.

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