Temporal and spatial laws and simulations of erosion and deposition in the Lower Yellow River since the operation of the Xiaolangdi Reservoir

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外文摘要：This study focuses on the Lower Yellow River(LYR),which has experienced con-tinuous erosion since the operation of Xiaolangdi Reservoir in 1999,and its spatiotemporal variation process is complex.Based on the single-step mode of the Delayed Response Model(DRM),we proposed a calculation method for simulating the accumulated erosion and depo-sition volume in the LYR.The coefficient of determination R2 between the calculated and measured values from 2000 to 2020 is 0.99.Currently,the LYR is undergoing continuous erosion,however the erosion rate is gradually slowing down,and the difference between the equilibrium and calculated values of accumulated erosion and deposition volume gradually decreases,which means riverbed erosion has a tendency towards equilibrium.Additionally,we derive a formula to simulate the spatial distribution of the main channel accumulated ero-sion volume per unit river length in the LYR based on the non-equilibrium suspended sedi-ment transport equation.The coefficient of determination R2 between the fitted values and measured values from 2003 to 2015 is approximately 0.98-0.99,with a relative error of ap-proximately 6.2％.The findings in this research suggest that under the current background of decreasing sediment inflow and continuous erosion in the LYR,it takes approximately 3.0 years for the riverbed to achieve half of the erosion and deposition adjustment and approxi-mately 13.0 years to achieve 95％of the adjustment.Moreover,the spatial distribution of accumulated main channel erosion volume in the LYR tends to become uniform with the continuous development of erosion.These results could provide a valuable reference for analysing the complex spatiotemporal variation process in the LYR.

外文关键词：

Lower Yellow Rivererosion and deposition adjustmentDelayed Response Modelnon-equilibrium sediment transport equation

作者：

SHEN Yi、WU Baosheng、WANG Yanjun、QIN Chao、ZHENG Shan

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作者单位：

State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China

Key Laboratory of Hydrosphere Sciences of the Ministry of Water Resources,Tsinghua University,Beijing 100084,China

Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China

Key Laboratory of River Regulation and Flood Control of Ministry of Water Resources,Yangtze River Sci-entific Research Institute,Wuhan 430010,China

State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China

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基金：

国家自然科学基金

项目编号：

U2243218

出版年：

2024

DOI：

10.1007/s11442-024-2219-x

地理学报(英文版)

中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCD

影响因子：1.307

ISSN：1009-637X

年,卷(期)：2024.34(3)

参考文献量36