Variation in reach-averaged bankfull discharge in the Yellow River Estuary in recent years

查看全文 作　　者：Zhuoyuan [1]YANG;Junqiang [1]XIA;Meirong [1]ZHOU;Shanshan [1]DENG;Zenghui [2]WANG;Zhiwei [1]LI

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;[2]College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China

出　　处：《Frontiers of Earth Science》索引2021年第15卷第3期,共14页

基　　金：supported by the Program of the National Key Research and Development Plan(No.2017YFC0405501);supported partly by the National Natural Science Foundation of China(Grant Nos.51725902,51579186,51809196). 摘　　要：The Yellow River Estuary(YRE)alternatively experienced channel aggradation and degradation during the period 1990-2016.To study the variation in flood discharge capacity during the process of river bed evolution,bankfull characteristic parameters were investigated on the basis of measured hydrological data and surveyed cross-sectional profiles,which was crucial for comprehending the processes and the key factors to cause these rapid changes.A reach-averaged method was presented in this study in order to calculate the characteristic bankfull parameters in the YRE,and this method integrated the geometric mean using the logarithmic transformation with a weighted mean based on the distance between the two successive sections.The reach-averaged bankfull parameters in the tail reach of the Yellow River Estuary(the Lijin-Xihekou reach)during the period 1990-2016 were then calculated.Calculated results indicated that the adoption of a concept of reach-averaged bankfull discharge was much more representative than the cross-sectional bankfull discharge,and the results also indicated that bankfull discharges decreased during the process of channel aggradation,and increased during the process of channel degradation.Finally,an empirical formula and a delayed response function were established between the reach-averaged bankfull discharge and the previous 4-year average fluvial erosion intensity during flood seasons,and both of them were adopted to reproduce the reach-averaged bankfull discharges,and calculated results showed high correlations(R^(2)>0.8)of these two methods. 关键词：channel adjustments reach-averaged bankfull discharge empirical relation delayed response equation Yellow River Estuary

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Variation in reach-averaged bankfull discharge in the Yellow River Estuary in recent years

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