[1]LI Pengfei,ZHANG Xiaochen,DANG Xu,et al.Investigation of Erosion Processes on the Slope-Gully System Using 3D Laser Scanning[J].Research of Soil and Water Conservation,2023,30(02):13-21.[doi:10.13869/j.cnki.rswc.2023.02.050]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 02
Page number:
13-21
Column:
Public date:
2023-03-10
- Title:
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Investigation of Erosion Processes on the Slope-Gully System Using 3D Laser Scanning
- Author(s):
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LI Pengfei, ZHANG Xiaochen, DANG Xu, HU Jinfei, YAO Wanqiang, HAO Mingkui
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(College of Gomatics, Xi'an University of Science and Technology, Xi'an 710054, China)
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- Keywords:
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soil erosion; 3D laser scanning; spatiotemporal pattern; slope-gully system; Loess Plateau
- CLC:
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P237
- DOI:
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10.13869/j.cnki.rswc.2023.02.050
- Abstract:
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In order to explore the soil erosion process of in-situ slope-gully systems, five runoff scouring experiments were undertaken on a slope-gully system plot established on a natural slope of a small catchment(i.e. Xindiangou Catchment)in the hilly-gully region of Loess Plateau, while the terrestrial laser scanning(TLS)was employed to acquire the ultra-high resolution terrain information of the slope-gully system. The digital elevation model(DEM)of difference(DoD)algorithm was used to derive the sediment yield of the plot. The accuracy of the derived sediment yield was then assessed by using the measured sediment yield. The spatial pattern of erosion-deposition within the slope-gully system was also investigated based on the DoD results. The results showed that:(1)DoD uncertainty(i. e. level of detection, LoD)ranged between 16.2 mm and 16.8 mm(average value is 16.5 mm)for a cumulative erosion monitoring, while LoD ranged between 16.2 mm and 16.6 mm with an average value of 16.4 mm for the consecutive erosion monitoring;(2)TLS-derived and measured cumulative sediment yields were highly correlated(R2>0.9, p<0.05), and the mean(minimum-maximum)relative errors of TLS-derived values for the hillslope, the gully slope and the whole of the slope-gully system were found to be 52.63%(26.06%~106.98%), 56.68%(30.26%~75.49%)and 56.28%(33.37%~73.28%), respectively; no significant relation(R2<0.57, p>0.05)was found between TLS-derived and measured consecutive sediment yield, and the mean(minimum-maximum)relative errors of TLS-derived values were 83.70%(4.08%~190.40%), 91.41%(0.95%~225.09%)and 87.58%(4.09%~215.55%), which demonstrated that TLS was more suitable for a monitoring of cumulative sediment yield rather than consecutive sediment yield in the slope-gully system;(3)the amounts of erosion and sediment yield on hillslope, gully slope and slope-gully system increased with the progress of runoff scouring, while depositions on gully slope and the whole of the slope-gully system stabilized after a rapid increase in the first experiments;(4)on the hillslope, erosion mainly occurred on the upper and middle parts while deposition primarily occurred on the lower part; intensive erosion was found on most area of the gully slope, while the deposition was mainly found on the bottom of the gully. The area with erosion accounted for over 79% of the area with topographic changes. These results can provide the useful reference for erosion monitoring and erosion process studies on the Chinese Loess Plateau.