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[1]GU Gingran,ZHANG Xingqi,GU Libin,et al.Characteristics of Erosive Rianfall Events in West Guizhou Plateau Area[J].Research of Soil and Water Conservation,2016,23(02):39-43,48.

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Characteristics of Erosive Rianfall Events in West Guizhou Plateau Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 02 Page number: 39-43,48 Column: Public date: 2016-04-28

Title:: Characteristics of Erosive Rianfall Events in West Guizhou Plateau Area

Author(s):: GU Gingran¹, ZHANG Xingqi¹, GU Libin¹, JU Xiang¹, YANG Guangxi², GU Zaike²; 1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;
2. Guizhou Monitoring Station of Soil and Water Conservation, Guiyang 550002, China

Keywords:: erosive rainfall; characteristics of rianfall; soil erosion modulus; west Guizhou plateau area

CLC:: S157

DOI:: -

Abstract:: Characteristics of erosive rainfall are closely related to studies on soil erosion. Based on field observations of rainfall data, runoff and sediment generation on runoff plots, the characteristics of erosive rainfall in west Guizhou plateau are analysed. The results showed that: (1) rainfall erosivity values(R) is the product of rainfall kinetic energy (E) and the maximum 60 minute rainfall intensity (I₆₀); (2) sediment yield by rainfall of which amount was greater than the moderate event, accounted for 99.5% of the total sediment, furthermore, 79.4% of the total sediment resulted from six heavy rainfall events, soil erosion modulus generated by heavy rainfall events are quantitatively expressed as M=1.319EI₆₀ and M=0.328PI₆₀; (3) rainfall events of which erosivity was greater than 500 MJ·mm/(h·hm²) produced 73.6% of the total sediment, soil erosion modulus resulted from rainfall events of which erosivity was greater than 100 MJ·mm/(h·hm²), are quantitatively expressed as M=1.269EI₆₀ and M=0.324PI₆₀; (4) rainfall events of which duration ranged from 1 to 6 hours occurred frequently, and produced most of sediment, sediment generated from June to July accounted for 78% of the total sediment, soil and water conservation is important in the flooding period (especially from June to July), soil erosion modulus resulted from rainfall events occurred in June and July are quantitatively expressed as M=1.378EI₆₀ and M=0.346PI₆₀.

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