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[1]AO Liman,JIANG Chaohua,XU Qinxue,et al.Influence of Rock Surface Morphology on Runoff and Sediment in Karst Slope of Southwest China[J].Research of Soil and Water Conservation,2023,30(05):52-60.[doi:10.13869/j.cnki.rswc.2023.05.005.]

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Influence of Rock Surface Morphology on Runoff and Sediment in Karst Slope of Southwest China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 52-60 Column: Public date: 2023-08-10

Title:: Influence of Rock Surface Morphology on Runoff and Sediment in Karst Slope of Southwest China

Author(s):: AO Liman^1,2, JIANG Chaohua³, XU Qinxue^1,2, FANG Rongjie^1,2, FU Zhiyong⁴, CHEN Hongsong⁴; (1.Key Laboratory for Theory and Technology of Environmental Pollution Control in Guangxi,Guilin University of Technology,Guilin,Guangxi 541004,China; 2.Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area,Guilin University of Technology,Guilin,Guangxi 541004,China; 3.Guangxi Nanning Survey and Design Institute of Pearl River Commission,Nanning 530007,China; 4.Huanjiang Observation and Research Station for Karst Ecosystems,Chinese Academy of......)

Keywords:: rock surface morphology; runoff and sediment yield; karst; slope; simulated rainfall

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.05.005.

Abstract:: [Objective] The aim of the study is to explore the influence of exposed rock surface morphology on the runoff and sediment yield of karst slope, and then to enhance the understanding of rainfall erosion pattern on karst slopes. [Methods] The artificially simulated rainfall experiment was used to study the effects of three types of rock surface morphology on the characteristics of runoff and sediment yields of karst slope with rock outcrops. With no bare rock as the control, three kinds of rock surface morphology(smoothness, karst cave, karst gully)and three slope gradients(5°, 15°, 25°)were set up. [Results](1)Compared with no bare rock, the three kinds of rock surface morphology all can significantly increase surface runoff and reduce underground runoff. The average surface runoff coefficient of karst cave is the highest(26.2%), and the average underground runoff coefficient of karst gully is the lowest(18.4%).(2)The initial surface runoff time and the initial underground runoff time are both advanced because of the effect of the rock surface morphology, and the initial surface runoff time and the initial underground runoff time of karst cave are both earlier than those of other rock surface morphology.(3)The rock surface flow formed by the process that bare rock intercepts rainfall scoures the surface, which intensifies the surface sediment yield. The surface sediment yield shows the following order: smoothness>karst cave>karst gully>no bare rock.(4)When the slope is 5°, the three types of rock surface morphology all improve the sediment carrying capacity of surface runoff. When the slope is 15°, the smoothness and karst cave improves the sediment carrying capacity of surface runoff, and the karst gully weakens the sediment carrying capacity of surface runoff. However, the three types of rock surface morphology all weaken the sediment carrying capacity of surface runoff when the slope is 25°. [Conclusion] The rock surface morphology has a significant effect on runoff and sediment yield in karst slope. In the future, the observation and research on runoff and sediment yield of different rock surface morphology under natural conditions should be strengthened.

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Last Update: 2023-08-10