阿尔塔什水利枢纽泥沙淤积模型试验研究

发布时间：2018-02-28 03:13

本文关键词： 阿尔塔什水库泥沙淤积形态淤积量过机含沙量物理模型试验　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：阿尔塔什水利枢纽工程是叶尔羌河干流山区下游河段的控制性水利枢纽工程，在保障向塔里木河干流生态供水的前提下，以防洪、灌溉为主，兼顾发电等综合利用。水库多年平均入库悬移质输沙量为2993万t，多年平均入库推移质输沙量为385万t，库沙比为86.06，属于泥沙问题比较严重的水库。本文结合阿尔塔什水库，采用物理模型试验，水平比尺L500，垂向比尺H100。悬移质泥沙按照沉降相似准则设计模型沙级配，同时进行扬动流速相似的校核；推移质泥沙按照起动流速相似准则设计模型沙级配。针对两种水库泥沙调度运行方式，研究了水库泥沙淤积演变过程、各特征库容的淤积量、发电机组的过机含沙量等，，分析总结了不同运行方式对水库泥沙淤积的影响。通过对比分析，为水库的泥沙调度运行方案提出建议。两种运行方式中，运行方式二，水库运行100年，汛期保持低水位运行，淤积三角洲推进至坝前，库尾泥沙基本无淤积，淤积总量相对较小，兴利库容较大，为本文的推荐方案。
[Abstract]:The Altash Water Conservancy Project is a controlling water conservancy project in the lower reaches of the mountainous area of the Yerqiang River. On the premise of ensuring ecological water supply to the main stream of the Tarim River, the main project is flood control and irrigation. The average amount of suspended sediment into reservoir is 29.93 million t, the average load of bed load is 3.85 million t and the ratio of reservoir to sand is 86.06, which belongs to the reservoir with serious sediment problem. Combined with the Altash reservoir, the physical model test, horizontal scale L500, vertical scale H100. the suspended sediment design model sand gradation according to the settlement similarity criterion, at the same time carry on the examination of the similar lifting velocity; The model sand gradation is designed according to the incipient velocity similarity criterion. In view of two kinds of reservoir sediment operation modes, the evolution process of reservoir silt accumulation, the silting capacity of each special reservoir, the sediment content of generator sets and so on are studied. The influence of different operation modes on reservoir sediment deposition is analyzed and summarized. Through comparative analysis, some suggestions are put forward for reservoir sediment operation scheme. Among the two operation modes, the second is reservoir operation for 100 years, and the other is to keep low water level in flood season. The silt delta is pushed to the front of the dam, the silt in the tail of the reservoir is basically no silt, the total amount of siltation is relatively small, and the reservoir capacity is large, which is the recommended scheme in this paper.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV145;TV149.2

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