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Coupled modeling of bed deformation and stability analysis on a typical vulnerable zone on the Ningxia reach of the Yellow River during flood season
Journal of Flood Risk Management ( IF 4.1 ) Pub Date : 2021-03-03 , DOI: 10.1111/jfr3.12704
Ximin Yuan 1 , Lugan Cao 1 , Shuaijing Jia 2 , Fuchang Tian 1
Affiliation  

The Ningxia reach of the Yellow River (NRYR) is wide and shallow, and instability and damages are likely to occur at its vulnerable zone. In this study, based on the one‐dimensional hydro‐sediment dynamics, two‐dimensional hydro‐sediment dynamics and vulnerable zone stability analysis model, a coupled model was established to analyze the scouring risk of the vulnerable zones in the NRYR during flood season. Considering the morphological change of bank slope at the vulnerable zones caused by flow erosion, the seepage stability of a typical spur dyke and protection embankment under the water level fluctuation conditions was analyzed. To fully reflect the coupled scouring effect of flow and sediment, the water flow scouring intensity index α is proposed. A significant increase of water flow scouring intensity index α will result in bank toe scouring, while its significant decrease will lead to silting of the bank toe. The probability of instability failure of the bank for the spur dyke slope is greater during the flood recession period. Compared with the influence of the change of river water level in the flood season, the slip stability of the bank slope is more sensitive to the change of bank toe erosion.

中文翻译:

黄河宁夏河段汛期典型脆弱带河床变形与稳定性分析耦合模型。

黄河(NRYR)的宁夏河段宽而浅,其脆弱地区很可能发生不稳定和破坏。在这项研究中,基于一维水沙动力学,二维水沙动力学和脆弱区稳定性分析模型,建立了一个耦合模型来分析NRYR汛期脆弱区的冲刷风险。考虑到水流侵蚀引起的脆弱区岸坡形态变化,分析了典型丁坝和防护堤在水位波动条件下的渗流稳定性。为了充分反映水沙的耦合冲刷效果,提出了水流冲刷强度指标α。水流冲刷强度指数α的显着增加将导致堤趾冲刷,而其显着下降将导致银行脚趾淤积。在洪水衰退期间,堤坝堤防坡失稳的可能性更大。与汛期河水位变化的影响相比,岸坡的滑移稳定性对岸坡侵蚀变化更为敏感。
更新日期:2021-05-10
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