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[1]ZHANG Siqi,MA Qianhong,ZHU Tong,et al.Micro Topography Characteristic of Karst Slope and Its Response to Soil Erosion Based on 3D Laser Scanning Technique[J].Research of Soil and Water Conservation,2021,28(04):8-14.

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Micro Topography Characteristic of Karst Slope and Its Response to Soil Erosion Based on 3D Laser Scanning Technique

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 8-14 Column: Public date: 2021-08-10

Title:: Micro Topography Characteristic of Karst Slope and Its Response to Soil Erosion Based on 3D Laser Scanning Technique

Author(s):: ZHANG Siqi¹, MA Qianhong¹, ZHU Tong¹, GU Zaike², ZHANG Keli¹; (1.Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China; 2.Guizhou Monitoring Station of Soil and Water Conservation, Guiyang 550002, China)

Keywords:: karst; simulated rainfall; 3D laser scanning; micro topography characteristics; boulder outcropping

CLC:: S157.1

DOI:: -

Abstract:: To explore the variation of micro topography condition and its relationship with soil erosion on slope of yellow soil in karst region, we analyzed the variation of surface roughness and depression storage as well as its response to soil erosion by means of simulated rainfall experiments and 3D laser scanning technology. The experiments were all implemented on the plots with 25° slope gradient. Three levels of rainfall intensity(30,60,90 mm/h)and four grades of boulder outcropping(0,5.4%,13.1%,42.9%)were designed as the treatments in experiments. The results show that:(1)under the light rainfall with intensity of 30 mm/h, the existence of boulder outcropping could promote runoff initiation, and the runoff-yielding time was brought forward by 18.0%～57.2%. However, this phenomenon was not obvious under heavy rainfalls. The production of surface runoff and soil loss tended to increase and then decrease with the increase of boulder outcropping; in light(30 mm/h)and heavy rainfall cases(60,90 mm/h), the production of surface runoff and soil loss reached the maximum when the boulder outcropping was in the range of 5.4%～13.1% and 13.1%～42.9%, respectively;(2)the surface roughness and depression storage tended to increase from the top to the bottom of the non-boulder outcropping slope. However, the distribution of surface roughness along the boulder outcropping slope was in a random. On the whole, the depression storage also tended to increase from the top to the bottom along the boulder outcropping slope. Under the same rainfall effect, the variation amplitude of surface roughness on boulder outcropping slope was greater than that of non-boulder outcropping slope. Compared with before the rain, the multiple of depression storage decreased with the increase of boulder outcropping;(3)there were good linear relationships between depression storage and runoff and sediment rate when the boulder outcropping was less than 42.9%. Surface micro topography factors can be regarded as the important parameters for soil erosion prediction, and can provide theoretical basis for the supplement of missed data in heavy rainstorm events.

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Last Update: 2021-08-20