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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。
The meandering river is one of the common river types in the alluvial plain. In view of the specific natural conditions of a specific river, it is necessary to predict the characteristics of a river under different river patterns in order to select and adjust the corresponding scheme. Using the hydrodynamic model of water catchment, sediment transport module, pollutant transport module and water quality prediction module as an example, the numerical simulation was carried out by computer. Under the condition of flood, the numerical simulation was carried out. Based on the analysis of the water flow characteristics of the three kinds of working conditions, it was found that the flow velocity of the bank increased firstly and then decreased and the flow rate of the concave bank decreased first and then increased , The water level of the concave bank is obviously higher than that of the embankment; the flow velocity distribution is more symmetrical in both sides of the working condition, and the fork channel plays the role of flood diversion and detention; the phenomenon of water flow swinging in the three banks of the working condition is not as obvious as the working condition and the lining construction amount is relatively small, River protection measures.