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[1]YU Changhong,LI Jiuhao,CHEN Kai,et al.Effects of Rainfall Factors on Runoff and Sediment Generation in Laterite Area[J].Research of Soil and Water Conservation,2015,22(01):17-20.

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Effects of Rainfall Factors on Runoff and Sediment Generation in Laterite Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 01 Page number: 17-20 Column: Public date: 2015-02-28

Title:: Effects of Rainfall Factors on Runoff and Sediment Generation in Laterite Area

Author(s):: YU Changhong, LI Jiuhao, CHEN Kai, JIANG Junhong, WEI Xinna; College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510640, China

Keywords:: soil erosion; rainfall factors; runoff erosion power; grey correlation analysis; non-dimensionalization

CLC:: S157

DOI:: -

Abstract:: By applying three dimensionless grey correlation analysis methods, effects of 12 rainfall factors on runoff generation, and then together 3 more runoff factors on sediment generation were quantitatively investigated in laterite bare lands and eucalyptus forests. Results showed that with different non-dimensionalization methods, correlation ranks of these factors changed. Most combined factors rank prior to single factors. Compared with PI₃₀ where P is rainfall amount and I₃₀ is rainfall density in 30 min, PI₅ is a proper indicator more suitable to represent rainfall-induced erosion in the laterite bare lands, and PI₁₀ is another proper one in the case of laterite eucalyptus forests. Actually, in eucalyptus forests, prior to traditional rainfall factors, a combined factor representing runoff erosive power, denoted by Q_m’ H, where Q_m is the peak discharge and H is runoff depth, is more suitable in hill slope soil erosion models. This study is of significance to guide an establishment of grey correlation of erosive factors and a standard procedure for soil erosion research. It also provides the theoretic support for the development of soil erosion prediction models in laterite regions.

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