冲淤面积分配模式对黄河下游一维模型计算结果的影响

发布时间：2018-03-31 23:31

  本文选题：一维耦合模型　切入点：冲淤面积　出处：《泥沙研究》2017年01期

【摘要】：冲淤面积分配模式是一维水沙数学模型中需要处理的技术问题之一,合理选择冲淤面积分配模式能够保证一维模型的计算精度。本文首先建立了用于模拟实际游荡型河流复杂断面形态下洪水演进的一维水沙耦合模型。然后以黄河下游游荡型河段为研究对象,利用下游1992年实测高含沙洪水过程资料对所建模型进行了验证,计算值与实测值吻合较好。最后采用一维模型中常用的五种冲淤面积分配模式计算了该场次高含沙洪水过程,分析了不同分配模式对模拟结果的影响。结果表明:等厚度分配模式的计算效果相对较好,按子断面流量分配与按挟沙力分配两种模式的计算精度相当。冲淤面积分配模式对流量及水位影响相对较小,而对含沙量及河道冲淤过程影响较为明显,尤其对于淤积严重的河段。
[Abstract]:Scour area distribution pattern is one of the technical problems need to deal with the one-dimensional sediment mathematical model, reasonable selection of scour area distribution model can ensure the accuracy of the one-dimensional model. This paper firstly established for simulating sediment coupled model of actual complex cross-section shape of braided river flood in the lower reaches of the Yellow River. Then the wandering reach as the research object, using the 1992 high sediment flood process downstream measured data to verify the model, the calculated values are in good agreement with the measured value. Finally, by using a one-dimensional model five sedimentation area distribution mode is used to calculate the process of hyperconcentration flood screenings, analyzes the influence of the different distribution patterns of simulation results. The calculation results show that the thickness distribution pattern is relatively good, according to sub section flow and the distribution according to the calculation precision of sediment carrying capacity distribution of two modes. The allocation mode of scour and deposition area has relatively little influence on discharge and water level, but has a more obvious impact on sediment concentration and river erosion and deposition process, especially for severe silting.

【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;华北水利水电大学水利学院;
【基金】：国家自然科学基金项目(51379156,51579186) 水利部公益性行业科研专项经费项目(201401038,201401023)
【分类号】：TV147
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本文编号：1692982