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。
Meandering river is one of the typical river channel types in alluvial plain. For rivers in a spe- cific 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 easel 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.
出处
《水利学报》
EI
CSCD
北大核心
2013年第9期1050-1057,共8页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(51279082)
清华大学水沙科学与水利水电工程国家重点实验室基金(2013-KY-3)
关键词
数值模拟
EFDC模型
弯曲河道
河道保护
numerical simulation
EFDC modeling
meandering river
river regulation
