Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China

[img]
Preview
PDF
Language: English
1439Kb
Title:Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China
Creators:
Qian, Feng ; qianfeng at whu dot edu dot cn; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Cheng, Dongbin; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Ding, Wenfeng ; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Huang , Jiesheng ; School of Water Resources and Hydropower Engineering of Wuhan University, Wuhan, Hubei 430010, China.
Liu , Jingjun ; Wuhan Hydrology and Water Resources Survey Bureau, Wuhan, Hubei 430074, China.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 64, 3, pp. 237-245
Uncontrolled Keywords:purple soil, runoff, flow hydraulics, sediment, slope gradient, rainfall intensity

Abstract

Hydrological processes play important roles in soil erosion processes of the hillslopes. This study was conducted to investigate the hydrological processes and the associated erosional responses on the purple soil slope. Based on a comprehensive survey of the Wangjiaqiao watershed in the Three Gorges Reservoir, four typical slope gradients (5°, 10°, 15°and 20°) were applied to five rainfall intensities (0.6, 1.1, 1.61, 2.12 and 2.54 mm·min–1). The results showed that both surface and subsurface runoff varied greatly depending on the rainfall intensity and slope gradient. Surface runoff volume was 48.1 to 280.1 times of that for subsurface runoff. The critical slope gradient was about 10°. The sediment yield rate increased with increases in both rainfall intensity and slope gradient, while the effect of rainfall intensity on the sediment yield rate was greater than slope gradient. There was a good linear relationship between sediment yield rate and Reynolds numbers, flow velocity and stream power, while Froude numbers, Darcy-Weisbach and Manning friction coefficients were not good hydraulic indicators of the sediment yield rate of purple soil erosion. Among the three good indicators (Re, v and w), stream power was the best predictor of sediment yield rate (R2 = 0.884). Finally, based on the power regression relationship between sediment yield rate, runoff rate, slope gradient and rainfall intensity, an erosion model was proposed to predict the purple soil erosion (R2 = 0.897). The results can help us to understand the relationship between flow hydraulics and sediment generation of slope erosion and offer useful data for the building of erosion model in purple soil.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China
Translated title:Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China
Creators:
Qian, Feng ; qianfeng at whu dot edu dot cn; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Cheng, Dongbin; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Ding, Wenfeng ; Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Wuhan, Hubei 430015, China.
Huang , Jiesheng ; School of Water Resources and Hydropower Engineering of Wuhan University, Wuhan, Hubei 430010, China.
Liu , Jingjun ; Wuhan Hydrology and Water Resources Survey Bureau, Wuhan, Hubei 430074, China.
Uncontrolled Keywords:purple soil, runoff, flow hydraulics, sediment, slope gradient, rainfall intensity
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:64
Number:3
Page Range:pp. 237-245
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8665
Item Type:Article
Deposited On:18 Aug 2016 14:26
Last Modified:18 Aug 2016 12:26

Citation

Qian, Feng; Cheng, Dongbin; Ding, Wenfeng; Huang , Jiesheng; Liu , Jingjun (2016) Hydraulic characteristics and sediment generation on slope erosion in the Three Gorges Reservoir Area, China. Journal of Hydrology and Hydromechanics, 64 (3). pp. 237-245. ISSN 0042-790X

Repository Staff Only: item control page