發(fā)布時間：2018-04-08 14:01

  本文選題：雅魯藏布江　切入點：EFDC　出處：《重慶交通大學》2016年碩士論文

【摘要】：近年來隨著國家西部開發(fā)戰(zhàn)略的實施,青藏高原地區(qū)與全國的交流日益密切,隨著青藏高原地區(qū)的發(fā)展,對于雅魯藏布江的開發(fā)利用也要快速增多。但是由于對于雅魯藏布江的河床演變研究的資料較少,制約了雅魯藏布江的開發(fā)利用,所以研究雅魯藏布江的河床演變對河流的開發(fā)利用有著十分重要的意義,而且也為以后的對雅魯藏布江的研究提供參考。本文選取雅魯藏布江的桑日河段作為研究河段,通過EFDC建立桑日河段的三維的水沙非耦合數學模型,對桑日河段的河床演變進行數值模擬研究。主要內容包括:(1)通過實測資料,分析對比河道斷面的變化,討論雅魯藏布江桑日河段的近期河床演變規(guī)律。分析可知:河段上部分河床變化劇烈;中段以及下段河勢較為穩(wěn)定。(2)介紹數學模型的建立過程,控制方程的離散求解,而且對在方程求解過程中所需使用的各個參數進行設置。(3)建立三維水動力模型,計算得到各個頻率洪水下的水流條件,分析計算得到的結果。計算表明:上游河段為流速、比降較小的河段,中段流速、比降較大,泥沙不容易落淤,河段下段主流流速迅速降低,深泓線陡然下降,上游輸移下來的泥沙將會沉積。(4)建立三維的水沙數學模型,在研究泥沙的輸移問題時,將先對懸移質和推移質進行單獨分析,研究懸移質在洪水流量下的輸移規(guī)律,以及推移質輸沙帶的分布,最后再模擬河段長時間的河床演變,對桑日河段的河床演變提出長期預測。結果表明,桑日河段上段和下段總體河床演變趨勢均為淤積,中段急彎處年內沖淤變化較大。
[Abstract]:In recent years, with the national implementation of the western development strategy, Qinghai Tibet Plateau and the increasingly close exchanges, with the development of the Tibetan Plateau, for the development and utilization of the Yarlung Zangbo River have increased rapidly. But due to the Brahmaputra River riverbed evolution research material less, restrict the utilization of Brahmaputra River, so the development and utilization of study on the evolution of the river Brahmaputra River has a very important significance, but also provide reference for research on the Brahmaputra River in the future. This paper selected as the research section of the Yarlung Zangbo River, river water, three-dimensional mathematical model of the Sha Fei by EFDC, research of numerical Simulation on the evolution of SANGRI river bed. The main contents include: (1) based on the measured data, analysis of the changes of river section comparison, discussion on the Mulberry River Brahmaputra The river bed evolution. Analysis shows that the river part of the river bed changes sharply; the middle and lower section of the river regime is relatively stable. (2) describes the process of establishing the mathematical model, the discrete equations are solved, and the various parameters required for use in the process of solving the equation set. (3) the establishment of three-dimensional hydrodynamic model the calculated flow conditions, each frequency of flood, the analytical results obtained. Calculation results show that: the upper reaches of the river is smaller than the velocity, lower reach, middle velocity gradient is larger, not easy to sediment silting, the river section of the mainstream velocity decreases rapidly, thalweg precipitously, sediment deposition upstream will transport down. (4) to establish mathematical model of sediment transport problem in 3D, sediment research, will be the first suspended and bed were analyzed separately, the research of suspended sediment transport in the flood displacement law of flow, and bedload transport With the evolution of distribution, and finally reach the long time simulation of river bed, SANGRI river bed change proposed long term prediction. The results show that the upper and lower reaches of the evolution trend of the whole section of river bed is silt, silt at middle bends changed greatly during the year.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TV147

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本文編號：1721927