| Cite this article: | 柳明洋,李春光.连续弯道中河心洲可侵蚀层对水动力的影响分析[J].灌溉排水学报,2022,(12):-. |
| liumingyang,lichunguang.连续弯道中河心洲可侵蚀层对水动力的影响分析[J].灌溉排水学报,2022,(12):-. |
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| DOI：10.13522/j.cnki.ggps.2021634 |
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| Analysis of the hydrodynamic impact of erodible layers in river cores in continuous bends |
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liumingyang1, lichunguang2
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1.Ningxia University;2.North Minzu University
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| Abstract: |
| Abstract: 【Objective】To study the effects of sediment erosion on river hydrodynamics in continuous bends, 【Method】Based on two-dimensional average depth shallow water equation to develop the mathematical model of riverbed erosion, and MIKE 21 was used to simulate the process of variation of flow velocity and water depth in a continuous bend of the Yellow River at Yongfeng Ferry, Ningxia, which contains several river cores. 【Result】At a 3 h flow rate of 1,545 m3/s at the Yongfeng crossing of the Yellow River Ningxia, compared with the non-erosion pattern, differential flow rates in the erosion pattern at the typical section decrease by 0.06-0.27 m/s and the water depth difference by 0.02-0.32 m, and erosion will result in smoother water depths and flow rates. Maximum siltation thickness of up to 0.12 m, maximum riverbed erosion depth of up to 0.24 m after 6 hours, maximum siltation thickness of up to 0.23 mAs flow rates and erosion times increase, the trend of riverbed evolution does not change, but only the depth of erosion and the thickness of siltation in the riverbed are altered. 【Conclusion】This study can provide a reference for riverbed management efforts. Erosion increases the stability of the hydrodynamic conditions, and the morphology of the riverbed evolution does not change the final evolution with the magnitude of the flow. |
| Key words: Yellow River, sediment, riverbed erosion, continuous bend, numerical simulation |
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