文章摘要
史莹,江春波,陈正兵,王英奎.弯曲河道对水流流态影响数值模拟[J].水利学报,2013,44(9):
弯曲河道对水流流态影响数值模拟
Numerical simulation of flow pattern in meandering rivers
  
DOI:
中文关键词: 数值模拟  EFDC模型  弯曲河道  河道保护
英文关键词: numerical simulation  EFDC modeling  meandering river  river regulation
基金项目:
作者单位
史莹 清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室北京100084 
江春波 清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室北京100084 
陈正兵 清华大学水利水电工程系水沙科学与水利水电工程国家重点实验室北京100084 
王英奎 长江勘探规划设计研究院湖北武汉430010 
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中文摘要:
      蜿蜒型河流是冲积平原常见的河型之一。针对具体河流的特定自然条件,需要对不同河道形态下的河道特性做出预测,以便选择和调整相应方案。采用集水动力模块、泥沙输运模块、污染物运移模块和水质预测模块为一体的环境流体动力学模型,利用计算机进行数值模拟,对京郊某弯曲河道3种河道形态在50年一遇洪水过程下进行数值模拟,在此基础上对3 种工况下河道的水流特性进行分析,发现工况一弯道处凸岸流速先增加后减小,凹岸流速先减小后增大,凹岸水位明显高于凸岸水位;工况二两岸流速分布较为对称,叉道起到分洪滞洪作用;工况三两岸水流摆动现象不如工况一明显,衬砌工程量较小,并提出相应河道保护措施。
英文摘要:
      Meandering river is one of the typical river channel types in alluvial plain. For rivers in a specific natural condition, it is necessary to predict the channel characteristics under different treatment plans and thus in turn to make a choice or adjustment among these plans. The Environmental Fluid Dynamic Code (EFDC) is a numerical simulation model which contains hydrodynamic models, sediment transport models,and toxics transport models and water quality models. This work uses the EFDC model to simulate the current characteristic of a meandering river in the suburb of Beijing under three different cases. It is shown that in the casel flow velocity on the convex bank first increases at first and then decrease, while that on the concave bank decreases first and then increases. Besides, the water level on the concave bank is apparently higher than that on the convex bank in Case 1. Comparing with those results in Case 1, the flow velocity distribution on the two banks does not vary too much in the Case 2 and the bifurcate channel has a function of flood diversion and detention. In the Case 3, the water does not swing so much as that in the Case 1 and the work amount of channel lining is relatively small. The channel protection procedures are put forward then according to the current characteristics.
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