Effect of Soil and Water Conservation Measures on Sediment Reduction in Fully Weathered Granite Area Based on TLS

Ruo Chen; Yonghua Xia; Minglong Yang; Zhigang Kong; Hua Ge; Yi Jiang; Qi Zhu

doi:10.3788/LOP202259.1028005

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 10 >Page 1028005 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 10, 1028005 (2022)

Effect of Soil and Water Conservation Measures on Sediment Reduction in Fully Weathered Granite Area Based on TLS

Ruo Chen^1、2, Yonghua Xia^2、*, Minglong Yang^2、**, Zhigang Kong¹, Hua Ge³, Yi Jiang³, and Qi Zhu^1、2

Author Affiliations

¹Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan , China

²Surveying & Mapping Technology and Application Research Center on Plateau Mountains of Yunnan Higher Education, Kunming University of Science and Technology, Kunming 650093, Yunnan , China

³Technology Center of Southwest Pipeline Co., Ltd., National Pipeline Network Group, Chengdu 610037, Sichuan , China

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DOI: 10.3788/LOP202259.1028005 Cite this Article Set citation alerts

Ruo Chen, Yonghua Xia, Minglong Yang, Zhigang Kong, Hua Ge, Yi Jiang, Qi Zhu. Effect of Soil and Water Conservation Measures on Sediment Reduction in Fully Weathered Granite Area Based on TLS[J]. Laser & Optoelectronics Progress, 2022, 59(10): 1028005 Copy Citation Text

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Fig. 1. Schematic of experiment setup

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Fig. 2. Slope point cloud and surface modeling. (a) Slope point cloud; (b) surface modeling

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Fig. 3. Point cloud on slope and DEM contrast map. (a) 10°; (b) 20°; (c) 40°

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Fig. 4. Sediment yield rate

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Particle size /mm	>5.0	5.0-0.5	0.50-0.075	<0.075
Mass fraction /%	8.74	47.78	42.35	1.13

Table 1. Particle size grading of sandy soil

Slope	Soil and water conservation measure	Numbering of plots	Treatment of plots
	No control measure	CK	Bare slope， without any vegetation cover and water and soil conservation measures
10°	Engineering measure	EM	Drainage ditch （semicircular PVC pipe with a length of 3 m and a radius of 10 cm） + geogrille + wooden rafter （simulated shallow buried retaining wall）
10°	Engineering+Tillage measures	ET1	The topmost layer is laid with 10 cm thick planting soil， drainage ditch + drainage ditch
20°	Plant measure	PM1	Artificial grassland （60% coverage）
20°	Plant measure	PM2	Artificial grassland （70% coverage）
40°	Engineering+Tillage measures	ET2	The topmost layer is laid with 10 cm thick tillage soil， geogrid + wooden rafters + drainage ditches + cut-off ditches
40°	Engineering+Tillage measures	ET1	The topmost layer is laid with 10 cm thick planting soil， drainage ditch + drainage ditch

Table 2. Design and treatment of experiment plot

Indicator	10°	20°	40°
Average gap long /m	0.937	1.910	2.927
Biggest gap long /m	1.422	2.401	2.985
Average groove depth /m	0.136	0.286	0.386
Biggest groove depth /m	0.108	0.226	0.462
Average groove width /m	0.164	0.245	0.769
Biggest groove width /m	0.330	0.383	0.886

Table 3. Microscopic indexes of each slope rill after the third rainfall

Slope	Soil and water conservation measure	Actual cumulative erosion /（ $g \cdot m^{- 2}$ ）	Calculated cumulative erosion /（ $g \cdot m^{- 2}$ ）	Absolute error /（ $g \cdot m^{- 2}$ ）	Relative error /%
10°	EM	180.0	183.0	3.0	1.74
10°	CK	2010.6	2058.6	48.0	2.40
	ET1	143.4	146.4	3.0	1.94
20°	PM1	615.0	629.4	14.4	2.3
	CK	6372.6	6532.8	160.2	2.51
	PM2	328.2	336.6	8.4	2.53
40°	ET2	5424.6	5564.4	139.8	2.58
	CK	291523.8	303272.4	11748.6	4.03
	ET1	42051.6	43077.6	1026.0	2.44

Table 4. Comparison of actual cumulative erosion amount and calculated cumulative erosion amount

Slope	Soil and water conservation measure	Total erosion /（ $g \cdot m^{- 2}$ ）	Sediment reduction benefit /%
10°	CK	2010.6	0
	EM	180.0	91.04
	ET1	143.4	92.87
20°	CK	6372.6	0
	PM1	615.0	90.35
	PM2	328.2	94.85
40°	CK	291523.8	0
	ET2	5424.6	98.14
	ET1	42051.6	85.58

Table 5. Comparison of sediment reduction benefits

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