Assessment of flood dynamics in a mountain stream using high-resolution river flow records,Hydrological Processes

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Assessment of flood dynamics in a mountain stream using high-resolution river flow records
Hydrological Processes ( IF 2.8 ) Pub Date : 2023-02-23 , DOI: 10.1002/hyp.14841
Cong Xiao ₁ , Kiyosi Kawanisi ₂ , Mohamad Basel Al Sawaf ₂ , Xiao Hua Zhu ₁

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Understanding the streamflow hydrodynamics is important for forecasting flooding phenomena in mountainous rivers. Accordingly, based on long-term runoff observations obtained using diverse runoff techniques (i.e., rating curves and fluvial acoustic tomography (FAT)), the authors (1) evaluated and explored flood phenomena, (2) discussed the effects of dams on flood hydrograph, (3) and revealed backwater effects caused by river channel bends, sand bars, and floodplains. The duration and slope of the falling limb of the hydrograph were directly influenced by the catchment characteristics that affected runoff recession, whereas the behaviour of the rising limb of the hydrograph was directly influenced by rainfall. A weaker correlation between discharge and rainfall in higher flood events indicates that rainfall events were strongly altered by water released from dams in the basin. Additionally, because of the backwater effects, the rate at which the flow velocity and boundary shear stress changed with the increasing discharge was reduced, potentially slowing the pace of erosion. Our findings are relevant for managing mountain rivers, particularly in river bend reaches prone to backwater effects. The FAT method could help increase the ability to monitor short-term fluctuations in floods and associated hazards.

中文翻译：

使用高分辨率河流流量记录评估山区河流的洪水动态

了解水流流体动力学对于预测山区河流的洪水现象很重要。因此，基于使用不同径流技术（即额定曲线和河流声波层析成像 (FAT)）获得的长期径流观测，作者 (1) 评估和探索了洪水现象，(2) 讨论了水坝对洪水过程线的影响, (3) 并揭示了由河道弯道、沙洲和漫滩造成的回水效应。水文过程线下降沿的持续时间和坡度直接受影响径流衰退的集水区特征的影响，而水文过程线上升沿的行为则直接受降雨影响。在更高的洪水事件中，流量和降雨之间的相关性较弱表明降雨事件被流域中大坝释放的水强烈改变。此外，由于回水效应，流速和边界剪应力随流量增加而变化的速率降低，可能会减缓侵蚀速度。我们的研究结果与管理山区河流有关，特别是在易受回水影响的河湾地区。FAT 方法可以帮助提高监测洪水和相关灾害的短期波动的能力。我们的研究结果与管理山区河流有关，特别是在易受回水影响的河湾地区。FAT 方法可以帮助提高监测洪水和相关灾害的短期波动的能力。我们的研究结果与管理山区河流有关，特别是在易受回水影响的河湾地区。FAT 方法可以帮助提高监测洪水和相关灾害的短期波动的能力。

更新日期：2023-02-23

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