An Information Entropy-Based Methodology to Construct the Avulsion Threshold in the Tail Reach of the Estuarine Alluvial Plain
作者机构：State Key Laboratary of Water Resources and ManagementWuhan UniversityWuhan 430072China Changjiang SurveyPlanningDesign and Research Co.LtdWuhan 430010China State Key Laboratary of Simulation and Regulation of River Basin Water CycleChina Insititute of Water Resources and Hydropower ResearchBeijing 100048China Yellow River Institute of Hydraulic ResearchYellow River Conservancy CommisionZhengzhou 450003China
出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)
年 卷 期：2023年第37卷第5期
页 面：794-806页
核心收录：
学科分类：08[工学] 0837[工学-安全科学与工程] 0815[工学-水利工程] 081502[工学-水力学及河流动力学]
基 金：financially supported by the National Key Research and Development Program of China(Grant No.2023YFC3200026) the National Natural Science Foundation of China(Grant No.U2243238)
主 题：avulsion threshold threshold conditions entropy weight method tail reach Yellow River Estuary
摘 要：Channel avulsion is a natural phenomenon that occurs abruptly on alluvial river deltas,which can affect the channel *** causes for avulsion could be generally categorized as topography-and flood-driven ***,previous studies on avulsion thresholds usually focused on topography-driven factors due to the centurial or millennial avulsion timescales of the world’s most deltas,but neglected the impacts of flood-driven *** the current study,a novel demarcation equation including the two driven factors was proposed,with the decadal timescale of avulsion being considered in the Yellow River Estuary(YRE).In order to quantify the contributions of different factors in each category,an entropy-based methodology was used to calculate the contributing weights of these *** factor with the highest weight in each category was then used to construct the demarcation equation,based on avulsion datasets associated with the *** avulsion threshold was deduced according to the demarcation *** avulsion threshold was then applied to conduct the risk assessment of avulsion in the *** results show that:two dominant factors cover respectively geomorphic coefficient representing the topography-driven factor and fluvial erosion intensity representing the flood-driven factor,which were thus employed to define a two dimensional mathematical space in which the demarcation equation can be obtained;the avulsion threshold derived from the equation was also applied in the risk assessment of avulsion;and the avulsion threshold proposed in this study is more accurate,as compared with the existing thresholds.
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