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

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Yong Hu, Congcong Liu, Jinyun Deng, Wei Zhang, Yitian Li
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引用次数: 0

Abstract

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.

大型冲积河流的河槽-河坝景观中的水流阻力
准确估算大型冲积河流的流动阻力是模拟排泄、泥沙输移和洪水路径的基础。然而,估算河床阻力和河道-河段地貌附加阻力的方法仍然鲜有研究。在本研究中,我们利用长江沙市河段的原位河道水深测量、泥沙和水力数据,开发了一种计算流动阻力的半经验方法。我们的方法将流动阻力定量地分为河床阻力和附加阻力,在偏差率(∼20%)、均方根误差(∼0.008)和几何标准偏差(∼3)方面都表现出较高的精度。附加阻力在低流量条件下起主导作用,但在高流量条件下起次要作用,这主要是由于随着排水量的增加,河道-河床区域的动量交换减少。河床阻力先减小后增大,这可能是由于随着流速的增加,低水流和过渡水流水系的河床形态发生了变化。总之,我们的研究结果进一步加深了对大河水系河道-河床景观中水流阻力动态变化的理解,对河流生态学和洪水管理具有重要意义。
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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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