發(fā)布時間：2018-03-31 23:31

  本文選題：一維耦合模型　切入點：沖淤面積　出處：《泥沙研究》2017年01期

【摘要】：沖淤面積分配模式是一維水沙數(shù)學模型中需要處理的技術(shù)問題之一,合理選擇沖淤面積分配模式能夠保證一維模型的計算精度。本文首先建立了用于模擬實際游蕩型河流復雜斷面形態(tài)下洪水演進的一維水沙耦合模型。然后以黃河下游游蕩型河段為研究對象,利用下游1992年實測高含沙洪水過程資料對所建模型進行了驗證,計算值與實測值吻合較好。最后采用一維模型中常用的五種沖淤面積分配模式計算了該場次高含沙洪水過程,分析了不同分配模式對模擬結(jié)果的影響。結(jié)果表明:等厚度分配模式的計算效果相對較好,按子斷面流量分配與按挾沙力分配兩種模式的計算精度相當。沖淤面積分配模式對流量及水位影響相對較小,而對含沙量及河道沖淤過程影響較為明顯,尤其對于淤積嚴重的河段。
[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.

【作者單位】： 武漢大學水資源與水電工程科學國家重點實驗室;華北水利水電大學水利學院;
【基金】：國家自然科學基金項目(51379156,51579186) 水利部公益性行業(yè)科研專項經(jīng)費項目(201401038,201401023)
【分類號】：TV147
，

本文編號：1692982