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- 2018
溃漫堤洪水多维耦联数值模型及应用
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Abstract:
针对山洪沟防洪标准偏低、遭遇暴雨洪水时溃漫堤风险较大且较难准确预测的问题, 开展洪水多维耦联数值模型研究．基于圣维南方程与VOF法的标准k-ε双方程原理, 融合Abbott六点隐格式法、非结构化网格Roe格式的单元中心显式有限体积法与结构化网格PISO算法优势, 系统构建溃漫堤洪水多维耦联数值仿真模型．以贺兰山汝箕沟为研究对象, 模拟其遭遇百年一遇洪水时, 沟道一维、溃口三维与淹没区域二维的多维水流动态耦合演进过程及影响情况．结果表明, 溃漫堤洪水多维运动过程与流态模拟效果较好, 所建多维洪水耦联数值模型计算精度较高, 对多流态洪水动态耦合精确计算与淹没风险准确评估具有重要意义．
In view of the problems of low flood control standard of ravine，high risk of catastrophic dike and difficulty in accurate pridiction，the numerical model of flood multidimensional coupling was studied. Based on the principle of Saint-Vernon equation and VOF method，the Abbott six-point implicit scheme，the element center explicit finite volume method of unstructured grid Roe scheme and the advantages of structured grid PISO algorithm were fully integrated. A multi-dimensional computational model was built systematically. Taking the Rujigou valley of Helan Mountain as an example，the evolution process and influence of multidimensional water flow in the 1D river，2D model of calculated area and 3D segment breach flood inundated areas were analyzed when it was struck by 100-year flood. Results show better simulation for the multidimensional motion process and flow of collapse flood，and higher calculation accuracy for the numerical model with multidimensional flood coupling，which is of great significance for the accurate calculation of dynamic coupling of multi-stream flooding and the risk assessment of flooding risk
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