| 摘要: |
| 【目的】研究灌区多级阶梯明渠水流的水动力特性及泥沙淤积问题,并评价其对多阶明渠工程的影响。【方法】基于VOF方法，在Flow-3D平台上建立了山东省德州市牛角店输水工程的三维数学模型，通过模拟不同工况下的三维多阶明渠水流，对比分析水流流速分布、水面线变化及渠底泥沙淤积情况。【结果】水流流态平稳后，最大流速出现在第二级阶梯上，挟沙水流流速较清水流速大0.50~0.86 m/s；在挑坎及第二级阶梯上，水面线变化幅度较大；随着时间推移，泥沙主要淤积于挑坎前及第三级阶梯底部，200 s时淤积厚度最高达0.143 mm。【结论】在牛角店输水工程施工及后期运行中，适当加固第二级阶梯渠底，提升第二级侧墙高度，并通过调控下游水位以保证灌渠的安全运行。 |
| 关键词: 多阶明渠 三维数学模型 Flow-3D 流速分布 水面线 泥沙淤积 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目（51079095）；国家自然科学基金创新研究群体科学基金项目（51021004） |
|
| Mathematical modeling of multi-stepped open channel based on Flow-3D |
|
LI Daming,JIA Minghao,ZHANG Hongqiang,et al
|
| Abstract: |
| 【Objective】This study investigated hydrodynamic characteristics and sediment deposition of flow in multi stepped open channel of irrigation area and evaluate the impacts on multi stepped open channel projects.【Method】A three-dimensional mathematical model for Niujiaodian water transfer project in Dezhou,Shandong was established on Flow 3D platform based on the VOF method.By simulating the flow of three-dimensional multi-stepped open channel under different conditions,the velocity distribution of flow,variation of water surface profile and deposition of sediment at the bottom of channel were compared and analyzed.【Result】After the flow was steady,the maximum velocity appeared on the second stage of the open channel.The flow speed of the sand flow was 0.50-0.86 m/s greater than that of clear water.On the flip bucket and the second stage of the open channel,the water surface profile changed greatly.Over time,sediment deposited mainly in front of the flip bucket and at the bottom of the third stage of the open channel.The thickness of the deposition was up to 0.143 mm at 200 s.【Conclusion】During the construction and operation of the Niujiaodian project,it is necessary to appropriately strengthen the second stage bottom,raise the height of the second stage side wall and control the downstream water level for safe operation. |
| Key words: multi stepped open channel mathematical model Flow-3D velocity distribution water surface sediment deposition |
