| 可变网格下的堤防溃口展宽二维数学模型 |
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| 引用本文： | 袁晶,张为,张小峰.可变网格下的堤防溃口展宽二维数学模型[J].水科学进展,2013,24(3):358-365. |
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| 作者姓名： | 袁晶 张为 张小峰 |
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| 作者单位： | 1.长江水利委员会水文局,湖北武汉 430010; |
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| 基金项目： | 国家重点基础研究发展计划(973计划)资助项目，国家自然科学基金资助项目，The study is financially supported by the National Basic Research Program of China，the National Natural Science Foundation of China |
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| 摘 要： | 传统固定结构的计算网格不适于处理计算边界动态变化的问题,利用动网格技术,结合土力学中粘性土河岸的崩塌机理,建立了可变网格下的堤防溃口展宽二维数学模型,在对模型进行验证对比的基础上,对北江下游的大塘围蓄滞洪区口门处的崩塌展宽过程进行了模拟,模型计算结果表明:随着溃堤水流对堤防土体的冲蚀,堤防发生崩塌破坏,溃口洪水流量迅速增大,与实际相符,说明通过采用可变网格与土力学中粘性土河岸崩塌机理相结合的计算方法,使得模型具备准确模拟蓄滞洪区口门处横向崩塌展宽过程的优点。
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| 关 键 词： | 蓄滞洪区 堤防溃口 数值模拟 可变网格 |
| 收稿时间： | 2012-07-20 |
A two-dimensional numerical modeling of dike failure with movable grids |
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| YUAN Jing,ZHANG Wei,ZHANG Xiaofeng.A two-dimensional numerical modeling of dike failure with movable grids[J].Advances in Water Science,2013,24(3):358-365. |
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| Authors: | YUAN Jing ZHANG Wei ZHANG Xiaofeng |
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| Institution: | 1.Bureau of hydrology, Changjiang River Water Resources Commission,Wuhan 430010, China;2.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072, China |
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| Abstract: | When modeling the flood routing process in diversion areas with numerical models, the phenomena of scour and collapse at the diversion gate is very serious, which requires the model can adjust the boundary and move the calculation grids accordingly. The traditional constant calculation grid is not suitable to solve the problem of the dynamic change at the calculation boundary, so, in this paper, with the method of dynamic grids, combined with the collapse mechanism of cohesive riverbank in soil mechanics, a two-dimensional (2-D) dike failure plane numerical model with movable grids is established. The model is based on the comparison of calculated and measured data. The model is validated on the Datangwei flood detention basin. The result shows that during the erosion of dike burst flow, the landslip failure to the dike occurs, the flood discharge near the dam burst increases rapidly, which closes to actual experiences. It also shows that with the combination calculation method of the movable grid and collapse mechanism of the cohesive soil river-bank in Soil mechanics, the model simulates reasonably well the broadening process at the diversion gate. |
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| Keywords: | flood diversion area dike failure numerical model movable grid |
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