Responses of Effective Antecedent Rainfall on Surface Sediment Yield in Karst Area

Youjing Pan; Lixia Tang; Zhi Yang; Bo Du; Jin Luo

doi:10.11929/j.issn.2095-1914.2018.02.014

Journal of Southwest Forestry University > 2018 > 38(2): 89-94. > DOI: 10.11929/j.issn.2095-1914.2018.02.014

Youjing Pan, Lixia Tang, Zhi Yang, Bo Du, Jin Luo. Responses of Effective Antecedent Rainfall on Surface Sediment Yield in Karst Area[J]. Journal of Southwest Forestry University, 2018, 38(2): 89-94. DOI: 10.11929/j.issn.2095-1914.2018.02.014

Citation:

Responses of Effective Antecedent Rainfall on Surface Sediment Yield in Karst Area

Youjing Pan^1,,
Lixia Tang^2, ,,
Zhi Yang³,
Bo Du⁴,
Jin Luo⁵

1.
Reservoir Management Office of Houchang, Qiannan Guizhou 550400, China
2.
College of Forestry, Guizhou University, Guiyang Guizhou 550025, China
3.
Technical Consulting Research Center of Soil and Water Conservation in Guizhou, Guiyang Guizhou 550002, China
4.
Water Affairs Bureau of Qingzhen, Guiyang Guizhou 551400, China
5.
Reservoir Management Office of Tianwen, Weng′an Guizhou 550400, China

More Information

Received Date: August 23, 2017
Revised Date: December 24, 2017
Published Date: February 28, 2018

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Abstract

Abstract

Taking GuanLing-Xiangle Small Watershed as the research area, the relationship between the occurrence of surface erosion and the early effective rainfall in the Karst area was analyzed by the fractal distribution theory to calculate the effective prophase rainfall of the basin. Results showed that both the accumulative frequency of the erosion and sediment yield and rainfall, and the accumulation rainfall threshold of the sediment and rainfall time followed the fractal power exponent relation. The early effective rainfall model can be established by the fractal distribution theory to combine the rainfall and sediment yield in the Karst basin, and the calculation results by this model was more practical than the traditional model. Combining the daily rainfall with the effective early rainfall determined the rainfall threshold of the erosive rainfall and sediment yield in the Karst river basin and was of great significance for the prediction of erosion and sediment yield in the Karst valley.
- effective antecedent rainfall,
- fractal distribution,
- sediment yield threshold,
- Karst,
- surface erosion

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