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[1]LIU Wei,WANG Suiji.Temporal and Spatial Change of the Sedimentation Rate on the Channel Cross-sections in the Lower Reaches of Yellow River and Its Influence Factors[J].Research of Soil and Water Conservation,2019,26(02):167-174.

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Temporal and Spatial Change of the Sedimentation Rate on the Channel Cross-sections in the Lower Reaches of Yellow River and Its Influence Factors

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 167-174 Column: Public date: 2019-04-28

Title:: Temporal and Spatial Change of the Sedimentation Rate on the Channel Cross-sections in the Lower Reaches of Yellow River and Its Influence Factors

Author(s):: LIU Wei^1,2, WANG Suiji^1,2; 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: lower reaches of Yellow River; channel cross-sections; sedimentation rate; temporal and spatial change

CLC:: P512.2

DOI:: -

Abstract:: The large amount of sediments delivered from the middle reaches of Yellow River Basin to the lower reaches has resulted in that the riverbed in lower reach is higher than ground and the lower reaches of Yellow River became a ’hanging river’, which is a potential threat to flood control. In order to reveal the sedimentation trend in the channel of the lower reaches of Yellow River, we calculated the sedimentation rates on the channel cross-sections of Huayuankou, Gaocun, Luokou, and Lijin gauging stations in the lower reaches of Yellow River based on the measured data since 1960, and analyzed the temporal and spatial change of the sedimentation rates. The results showed that the sedimentation rate of the above cross-sections decreased obviously in different time periods, which is related to the vigorous implementation of soil-and-water conservation measures, regulation of reservoirs, and water diversion in the basin. Due to the different operation strategies of reservoirs, the erosion rate during partial periods was relatively large, especially since 2010. The spatial evolution of the sedimentation rate of channel bed showed an increasing trend in the lower reaches passing the Gaocun station. In terms of braided, meandering, and straight three channel patterns along the lower reaches of Yellow River, the sedimentation rate of the braided channel is similar to that of the meandering channel, while that of the straight channel reach is the largest among the three channel patterns. This spatial variation trend is mainly related to the weakened flow power caused by the gradual reduction of the channel gradient. For the sake of a sustainable reduction in the sedimentation rate of the lower reaches of Yellow River, the continuous implementation of soil-and-water conservation measures in the middle and upper reaches and the planned water flushing of Xiaolangdi Reservoir are still the best choices for the lower Yellow River management in the future.

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