西藏扎拉水电站水库泥沙对电站运行影响试验研究
发布时间：2018-10-26 07:17
【摘要】：为了分析西藏玉曲河扎拉水电站运行后水库泥沙对电站取水发电产生的影响,基于扎拉电站整体河工模型试验成果,对扎拉电站运用50 a水库泥沙淤积过程,泄水建筑物及电站引水口前泥沙淤积分布、淤积高程,电站过机泥沙特性进行了试验研究。结果表明:水库运用50 a末,库区泥沙基本达到冲淤平衡,水库淤积总量约占总库容的66.45%;坝前泥沙淤积高程基本与底孔进口底高程齐平,对底孔泄流排沙影响不大;电站引水口前形成较明显的冲刷漏斗,引水渠淤积对电站正常引水影响不明显;电站过机泥沙,在水库运用初期没有0.1 mm的粗沙,在水库运用50 a末,遇常年含沙量洪水,过机泥沙中粒径0.1 mm的粗沙占过机总沙量的3.2%。建议下阶段进行优化水库调度,提高水库排沙效率的研究,进一步减少水库泥沙淤积,减轻泥沙对机组的磨损。
[Abstract]:In order to analyze the influence of reservoir sediment on water and power generation after the operation of Yuqu River Zala Hydropower Station in Tibet, based on the experimental results of the whole river engineering model of Zara Hydropower Station, the sediment deposition process of Zara Hydropower Station for 50 years is applied. The siltation distribution, siltation elevation and the characteristics of silt passing through the power station are studied experimentally in front of the draining structure and the diversion port of the power station. The results show that at the end of 50 years of operation, the sediment in the reservoir basically reaches the balance of scouring and silting, and the total amount of silt in the reservoir accounts for 66.45% of the total reservoir capacity, and the siltation elevation in front of the dam is basically level with the bottom height of the bottom hole, which has little effect on the discharge and discharge of sediment from the bottom hole. A more obvious scour funnel is formed in front of the diversion port of the power station, and the siltation of the diversion canal has no obvious effect on the normal diversion of the power station. There is no coarse sediment of 0.1 mm at the initial stage of operation in the power station. At the end of 50 years of operation, the coarse sediment with 0.1 mm diameter in the sediment passing through the reservoir accounts for 3.2% of the total sediment volume. It is suggested that optimization of reservoir operation should be carried out in the next stage to improve the efficiency of sediment discharge in the reservoir to further reduce sediment deposition and reduce the wear and tear of the unit.
【作者单位】： 长江科学院河流研究所;长江科学院国际河流研究所;
【基金】：国家自然科学基金项目(51579014)
【分类号】：TV145;TV737
[Abstract]:In order to analyze the influence of reservoir sediment on water and power generation after the operation of Yuqu River Zala Hydropower Station in Tibet, based on the experimental results of the whole river engineering model of Zara Hydropower Station, the sediment deposition process of Zara Hydropower Station for 50 years is applied. The siltation distribution, siltation elevation and the characteristics of silt passing through the power station are studied experimentally in front of the draining structure and the diversion port of the power station. The results show that at the end of 50 years of operation, the sediment in the reservoir basically reaches the balance of scouring and silting, and the total amount of silt in the reservoir accounts for 66.45% of the total reservoir capacity, and the siltation elevation in front of the dam is basically level with the bottom height of the bottom hole, which has little effect on the discharge and discharge of sediment from the bottom hole. A more obvious scour funnel is formed in front of the diversion port of the power station, and the siltation of the diversion canal has no obvious effect on the normal diversion of the power station. There is no coarse sediment of 0.1 mm at the initial stage of operation in the power station. At the end of 50 years of operation, the coarse sediment with 0.1 mm diameter in the sediment passing through the reservoir accounts for 3.2% of the total sediment volume. It is suggested that optimization of reservoir operation should be carried out in the next stage to improve the efficiency of sediment discharge in the reservoir to further reduce sediment deposition and reduce the wear and tear of the unit.
【作者单位】： 长江科学院河流研究所;长江科学院国际河流研究所;
【基金】：国家自然科学基金项目(51579014)
【分类号】：TV145;TV737
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