【摘要】：為了分析西藏玉曲河扎拉水電站運行后水庫泥沙對電站取水發(fā)電產(chǎn)生的影響,基于扎拉電站整體河工模型試驗成果,對扎拉電站運用50 a水庫泥沙淤積過程,泄水建筑物及電站引水口前泥沙淤積分布、淤積高程,電站過機泥沙特性進行了試驗研究。結(jié)果表明:水庫運用50 a末,庫區(qū)泥沙基本達到?jīng)_淤平衡,水庫淤積總量約占總庫容的66.45%;壩前泥沙淤積高程基本與底孔進口底高程齊平,對底孔泄流排沙影響不大;電站引水口前形成較明顯的沖刷漏斗,引水渠淤積對電站正常引水影響不明顯;電站過機泥沙,在水庫運用初期沒有0.1 mm的粗沙,在水庫運用50 a末,遇常年含沙量洪水,過機泥沙中粒徑0.1 mm的粗沙占過機總沙量的3.2%。建議下階段進行優(yōu)化水庫調(diào)度,提高水庫排沙效率的研究,進一步減少水庫泥沙淤積,減輕泥沙對機組的磨損。
[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.
【作者單位】： 長江科學(xué)院河流研究所;長江科學(xué)院國際河流研究所;
【基金】：國家自然科學(xué)基金項目(51579014)
【分類號】：TV145;TV737

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