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[1]DU Bo,TANG Lixia,PAN Youjing,et al.Characteristics of Runoff and Sediment Yields in the Karst Hillslope and Small Watershed[J].Research of Soil and Water Conservation,2017,24(01):1-6.

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Characteristics of Runoff and Sediment Yields in the Karst Hillslope and Small Watershed

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 01 Page number: 1-6 Column: Public date: 2017-02-28

Title:: Characteristics of Runoff and Sediment Yields in the Karst Hillslope and Small Watershed

Author(s):: DU Bo¹, TANG Lixia¹, PAN Youjing^1,2, YANG Zhi³; 1. College of Forestry, Guizhou University, Guiyang 550025, China;
2. Weng’an County Water Authority in Guizhou, Weng’an, Guizhou 550400, China;
3. Technical Consulting Research Center of Soil and Water Conservation in Guizhou, Guiyang 550002, China

Keywords:: karst; runoff plot; small watershed; rainfall; runoff and sediment yield

CLC:: S157.1

DOI:: -

Abstract:: The objective of this study was to analyze characteristics of runoff and sediment yields at two different scales (hillslope and watershed) in karst area. Data were collected in a soil and water loss monitoring station in Mahuangtian of Guanling County, Guizhou Province. The results showed that runoff and sediment began to produce when the accumulated rainfall of single event reached 9.1 mm with high rainfall intensity and 10.5 mm with low rainfall intensity. After runoff and sediment production, rainfall (P), average rainfall intensity (I), maximum 30 min rainfall intensity (I₃₀), maximum 60 min rainfall intensity (I₆₀) and rainfall duration (T) were 10～40 mm, 2～10 mm/h, 5～30 mm/h, 5～20 mm/h, 1～10 h, respectively. Statistical analysis showed that the levels of correlation between the rainfall characteristics and runoff/sediment yield decreased in the order: P > I₆₀ > I₃₀ > T. The differences in runoff and sediment yields were significant under the different measures. The waste-grassland without measures produced the highest runoff and sediment yields following by the slope cropland with economic fruit forest+maize, and the waste-grassland, and runoff and sediment yields in the water conservation forest and waste land with higher bare-rock rate were the lowst. Runoff and sediment yields from the small watershed and hillslope have same monthly change trend, but the yields were different. Runoff and sediment production processes were out of sync for the small watershed and hillslope. Therefore, the results from hillslope cannot fully reflect the characteristics of the runoff and sediment yield in the karst area.

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