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[1]LI Jinlin,WEI Jie.Features of River System Morphology and Its Response to Sediment Yield in the Jialing River Basin, China[J].Research of Soil and Water Conservation,2016,23(05):7-13.

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Features of River System Morphology and Its Response to Sediment Yield in the Jialing River Basin, China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 05 Page number: 7-13 Column: Public date: 2016-10-28

Title:: Features of River System Morphology and Its Response to Sediment Yield in the Jialing River Basin, China

Author(s):: LI Jinlin¹, WEI Jie^1,2; 1. College of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China;
2. Chongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 401331, China

Keywords:: fractal dimension; sinuosity of river reach; grey correlation degree; relative contribution; basin erosion and riverine sediment

CLC:: K903;P931

DOI:: -

Abstract:: The features of river system morphology represent the geomorphic development and hydrological processes, which helps make planning for hydropower development, ecological protection and soil and water conservation. However, it is not well understood in the Jialing River Basin, as well as its relation to the sediment yield and deposition. The fractal dimension and the sinuosity of river reaches are used to quantify the river system morphology in the Jialing River Basin. And then, the grey relation degree and nonlinear response model are applied to analyze the relationships between the fractal dimension, the sinuosity of river reaches and the sediment load and deposition, based on the DEM data by GIS software. The results show that the significant differences occur in the river system morphology among sub-basins. Among these sub-basins, the fractal dimension of the Qu River is 5.102, with a fastest bifurcation increment, the most complex branches and the most severe headwater erosion potential. The fractal dimensions for the Bailong River, the upper reach of the main stream, the middle and lower reaches of main stream and the Fu River are 3.706, 3.605, 3.576 and 3.548, respectively, indicating that no significant differences were found among the rest 4 sub-basins except for the Qu River from a perspective of branches complexity. Most of the reaches in each sub-basin are gentle meandering with a proportion about 73%～82% of the total, and the moderate meandering about 12%～20%. The number of high sinuosity reaches in the upper reaches of main stream, the middle and lower reaches of main stream, the Qu Rivers, the Fu River and the Bailong River is 79, 137, 158, 168 and 247, respectively. The grey relation degrees between the mean sediment loads, the depositions and the fractal dimensions are 0.618 and 0.641, respectively, showing stronger influence of the river system complexity on the sediment deposition than the sediment load. And the grey relation degrees between the mean sediment loads, the depositions and the sinuosity of rive reaches are 0.588 and 0.591, respectively, indicating that a more sensitive response of the sediment deposition to the sinuosity of rive reaches than the sediment load. In addition, the relative contributions of the sinuosity of river reaches and the branches structure complexity to the sediment load is 21% and 79%, while they are 18% and 82% for the sediment deposition.

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