Affiliation:
1. State Key Laboratory of Water Resources Engineering and Management Wuhan University Wuhan China
2. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an China
3. Key Laboratory for Water and Sediment Sciences College of Environmental Sciences and Engineering Ministry of Education Peking University Beijing China
4. Department of Bioproducts and Biosystems Engineering University of Minnesota Twin Cities Saint Paul MN USA
5. Chang Jiang Waterway Survey and Design Institute (Wuhan) Co., LTD Wuhan China
Abstract
AbstractDunes are important for bedload transport in almost all large river systems and exert an important control flow resistance. Investigating dunes is fundamental for simulating discharge, sediment transport, and flood routing. However, the spatiotemporal dynamics of dunes and flow resistance remain poorly understood in large alluvial river systems mainly due to the lack of high‐resolution data. Here we analyzed in‐field observed data on annual profiles of 450 cross‐sections, river bathymetry, discharge, water levels, and sediment in the Middle Yangtze River, and found that dunes developed and flow resistance increased (+10%) in the post‐Three Gorges Dam period. We ascertain that the development of dunes plays the dominant role in augmenting flow resistance, as evidenced by roughness height change (+29%) using a modified Van Rijn method. Ultimately, dune development was incorporated into a hydrogeomorphic numerical model of the Yangtze River to improve flow resistance quantification, and thus, the water level simulation. Our findings highlight the potential increase in flow resistance in response to upstream damming in large rivers and have important implications for flood management and riverine ecology.
Funder
State Key Laboratory of Loess and Quaternary Geology
Publisher
American Geophysical Union (AGU)
Cited by
2 articles.
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