| 王 军,陈胖胖,隋觉义.稳封期天然河道冰塞堆积的数值模拟[J].水利学报,2011,42(9): |
| 稳封期天然河道冰塞堆积的数值模拟 |
| Numerical simulation of ice jams in natural channels |
| |
| DOI： |
| 中文关键词: 冰塞 堆积厚度 天然河道 冰塞面变形方程 数学模型 |
| 英文关键词: ice jam equilibrium thickness natural channel equation describing the deformation of ice jam surface numerical model |
| 基金项目: |
|
| 摘要点击次数: 2208 |
| 全文下载次数: 296 |
| 中文摘要: |
| 冬季寒区河道中容易出现冰塞，冰塞出现使过水断面减少，河道阻力增加，进而引发凌洪灾害。借鉴泥沙输运理论推导得到的冰塞面变形方程，并结合标准k-ε模型建立了稳封期天然河道冰塞堆积厚度的数值模拟计算模型，采用贴体坐标变换法将曲线网格转化为正交网格，控制方程离散求解采用有限体积法，选取同位网格方法将所有计算变量布置于同一控制体积，引入动量插值法和压力校正方程耦合求解速度压力场，进而求解冰塞面变形方程获得冰塞堆积厚度。选取黄河河曲段天然河道，应用模型计算得出了稳封期河道中的冰塞堆积厚度，对比实测资料表明，数值模拟与 |
| 英文摘要: |
| Ice jams often occur in channels in winter or early spring in cold region. The formation of river
ice jam results in the decrease in flow cross section and increase in resistance of flow. In this paper，the equation describing the deformation of ice jam surface was built based on the theory of sediment move?ment. Then a model describing natural channel was established by combining the equation with the stan?dard k-ε equations model to simulate the equilibrium thickness of ice jam of natural channel. The curvilin?ear grid has generated by the technique of boundary-fitting curvilinear coordinate transformation. The model was solved by using finite volume method. Furthermore，all the variables are calculated at the same control volume by using the non-staggered grids. Momentum interpolation method was introduced. Then equilibrium thickness of ice jam can be calculated by using the equation describing the deformation of ice jam surface.Model validation was carried out by the observed data in Hequ Reach of the Yellow River. Thereafter，the equilibrium thickness of ice jam was simulated. The simulated thickness of ice jam by using the devloped model agrees well with field observations data. The developed model can be used to simulate ice accumula?tion in natural channels and the equilibrium thickness of ice jam in channel. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |