首页|Flow resistance in the channel-bar landscape of large alluvial rivers

Flow resistance in the channel-bar landscape of large alluvial rivers

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Accurate approaches for estimating flow resistance in large alluvial rivers are fundamental for simulating discharge,sediment transport,and flood routing.However,methods for estimating riverbed resistance and additional resistance in the channel-bar landscapes remain poorly investigated.In this study,we used in situ river bathymetry,sediment,and hydraulic data from the Shashi Reach in the Yangtze River to develop a semi-empirical approach for calculating flow resistance.Our method quantitatively separates flow resistance into riverbed resistance and additional resistance and shows high accuracy in terms of deviation ratio(～20％),root-mean-square error(～0.008),and geometric standard deviation(～3).Additional resistance plays a dominant role under low-flow conditions but a secondary role under high flows,primarily due to the reduction in momentum exchange in channel-bar regions as discharge increases.Riverbed resistance first decreases and then increases,which might be attributed to bedform changes in the lower and transitional flow regimes as flow velocity increases.Overall,our findings further the understanding of dynamic changes in flow resistance in the channel-bar landscapes of large river systems and have important implications for riverine ecology and flood management.

flow resistancechannel-bar landscapeinteraction regionlarge riverbedform

Yong HU、Congcong LIU、Jinyun DENG、Wei ZHANG、Yitian LI

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

CCCC Second Harbor Engineering Company Ltd,Wuhan 430040,China

Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430040,China

Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan 430040,China

CCCC Highway Bridge National Engineering Research Centre Co.Ltd,Wuhan 430040,China

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2024

10.1007/s11707-022-1040-z

地球科学前沿
高等教育出版社

地球科学前沿

CSTPCD
影响因子：0.585
ISSN：2095-0195
年,卷(期)：2024.18(2)