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[1]FAN Xinyi,HU Zuolong,ZHAO Guangju,et al.Characteristics and Dynamic Mechanism of River Channel Souring and Silting in the Fugu-Longmen Section During 2007-2017[J].Research of Soil and Water Conservation,2023,30(03):211-216.[doi:10.13869/j.cnki.rswc.2023.03.028]

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Characteristics and Dynamic Mechanism of River Channel Souring and Silting in the Fugu-Longmen Section During 2007-2017

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 211-216 Column: Public date: 2023-04-10

Title:: Characteristics and Dynamic Mechanism of River Channel Souring and Silting in the Fugu-Longmen Section During 2007-2017

Author(s):: FAN Xinyi¹, HU Zuolong², ZHAO Guangju^1,3,4, MU Xingmin^1,3, GAO Peng^1,3,4; (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Henan Water Environment Survey and Design Co., Sanmenxia, Henan 472000, China; 3.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 4.University of Chinese Academy of Sciences, Beijing 100049, China)

Keywords:: middle reaches of the Yellow River; river channel souring and silting; water-sediment variations; median particle size; sediment rating curve

CLC:: TV147

DOI:: 10.13869/j.cnki.rswc.2023.03.028

Abstract:: [Objective]River evolution is the result of the interaction between river flow and riverbed boundaries, and has a significant impact on the safety of water projects and the prevention and control of flooding. The Fugu-Longmen section of the middle reaches of the Yellow River is located in the Jin-Shan canyon, and is dominated by gully erosion landform of the Loess Plateau. Riverbank erosion is the main source of sediment in this area. So it is important to study the characteristics and influencing factors of river channel souring and silting in this section to control soil erosion in the middle reaches of the Yellow River. [Methods] Based on data of runoff, sediment and river cross-section in three typical hydrological stations, Fugu, Wubu and Longmen, the characteristics of channel erosion and siltation, and the related influencing factors in Fugu-Longmen section from 2007 to 2017 were analysed. [Results](1)The channel exhibited erosion in Fugu-Longmen section in the past 11 years, with the channel in Fugu-Wubu section exhibiting a gradual decrease and the channel exhibiting an increase in Wubu-Longmen section.(2)The Fugu-Wubu section showed a trend of decreasing water and increasing sediment, while the Wubu-Longmen section showed an overall trend of more water and less sediment. The amount of channel erosion and siltation in the two sections was synchronized with the change of sediment content in the water flow.(3)The median size of suspended sediment in the Fugu-Wubu section increased, then river scour became slower. The median size of suspended sediment in the Wubu-Longmen section tended to decrease, exacerbating river erosion.(4)The amount of incoming yellow sediment in the Fugu-Wubu section increased, the erosive force of the river weakened, and river scouring became slower. The Wubao-Longmen section was in a state of scouring due to human intervention, which reduced the amount of sediment entering the Yellow River and increased the erosive force of the river. These results are consistent with the pattern of channel evolution in both river sections. [Conclusion] The change of runoff and sediment have greatly affected the siltation of the Fugu-Longmen section. Under the background of improved ecological environment, it is significance to study the characteristics and dynamic mechanism of river channel dredging in this section of the river to further reduce soil erosion in the middle reaches of the river and prevent flood disasters in the middle and lower reaches of the river.

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Last Update: 2023-04-10