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[1]ZHANG Jin-shan,QU Yi,LIN Wei,et al.Suspended Load Characteristics of Xiaojiang River in the Scenario of Debris-Flow Afflux from Ravine[J].Research of Soil and Water Conservation,2011,18(06):37-41.

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Suspended Load Characteristics of Xiaojiang River in the Scenario of Debris-Flow Afflux from Ravine

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 18 Number of periods: 2011 06 Page number: 37-41 Column: Public date: 2011-12-20

Title:: Suspended Load Characteristics of Xiaojiang River in the Scenario of Debris-Flow Afflux from Ravine

Author(s):: ZHANG Jin-shan^1,2, QU Yi³, LIN Wei^1,2, ZHANG Yin-liang⁴; 1. Key Laboratory of Mountain Hazard and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China;
2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, China;
3. The No.6 Geological Team of the Shaanxi Bureau of Geology and Mineral Resources, Xi’an 710611, China

Keywords:: the Jiangjia Ravine; debris-flow; Xiaojiang River; suspended load

CLC:: P642.23

DOI:: -

Abstract:: The characteristics of sediment flows in the Xiaojiang River was studied when debris flowed into this river, and the solids transport is systematically investigated. A debris flow occurred on Aug. 14, 2009, in the Jiangjia Ravine was observed and the process of the afflux to the Xiaojiang River was also monitored. With the observation data, the flow of the suspended load in the Xiaojiang River was analyzed after the afflux of debris-flow. Debris flows usually provide a large number of suspended loads for the Xiaojiang River directly, which generally leads to the rapid increment of sediment transport in the river. The sediment transport rate of the suspended loads reached about five times of the normal level. Some of the debris flows deposit at the mouth of the Jiangjia Ravine and enter the Xiaojiang River by erosion. Thus, the suspended load transport rate is observed to decrease steadily rather than the decline like the exponential curve in Jiangjia Ravine. Moreover, fine sediment of the debris-flow is more likely to be transported in the Xiaojiang River. Therefore, the amounts of silts and clays increas with the sediment transport rate faster than that of fine sands. As the result, the relationship curves between the mean particle size, the sediment concentration, the discharge, and the sediment transport rate are found to be convex.

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