| 引用本文: | 霍玉国,洪振国,李建伟.不同年份水沙系列下水库泥沙淤积变化分析[J].灌溉排水学报,,():-. |
| Huo Yuguo,Hong Zhen-guo,Li Jian-wei.不同年份水沙系列下水库泥沙淤积变化分析[J].灌溉排水学报,,():-. |
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| 摘要: |
| 泥沙淤积引起库区水位抬高，侵占调节库容，造成库容损失，降低水库的调节能力，减少工程的效益，有害粒径对水轮机磨损，引起水轮机运行效率下降，出力和年发电量减小，检修间隔缩短和费用增大，影响机组正常运行。针对云南河流大多数山区河流，河道中泥沙含量受季节性影响性强，泥沙粒径变化幅度较大，河流走向弯道较多，恒定一维均匀流数学模型不能真实反映水库泥沙淤积情况，不适用云南地区，同时不同年份水沙系列下分析水库泥沙淤积变化研究具有重要作用。本文采用武汉水利电力大学研制开发的susbed-2一维恒定非均匀流输沙模型计算分析不同年份水沙系列下水库泥沙淤积变化。结果表明：(1)水库泥沙淤积的总体形态基本服从带状淤积规律，泥沙淤积最为剧烈的区域主要是坝前，泥沙淤积发展速度较快的时段主要是第1年，第1年以后水库泥沙淤积发展速度逐渐变慢，这些均反映了本水库所具有的基本泥沙淤积特征。 (2) 1998年水沙系列下水库泥沙累计淤积量较大， 1992～2001年水沙系列下水库泥沙累计淤积量较小，但是它们淤积总量却相去不远，泥沙累计淤积量总体成增加趋势。(3)1998年水沙系列与1992年～2001年水沙系列下得到成果相比较，由于入库沙量不同，淤积量也有所不同，但是历时2～3年后，不同水沙系列下排沙比均稳定在90%以上，变化范围在90%～102%，水库基本达到平衡。 |
| 关键词: 水电站水库;水沙系列;输沙模型;泥沙淤积变化 |
| DOI： |
| 分类号:TV253 |
| 基金项目: |
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| Analysis of Sediment Deposition Change of Reservoir under Water and Sediment Series in Different Years |
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Huo Yuguo, Hong Zhen-guo, Li Jian-wei
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Yunnan Water and Hydropower Engineering Investigation,Design and Research Institute
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| Abstract: |
| Sediment siltation causes the water level in the reservoir area to rise, encroaches on the regulated storage capacity, causes storage capacity loss, reduces the regulation capacity of the reservoir, reduces the benefits of the project, and the harmful particle size wears the hydraulic turbine, causing the reduction of the operating efficiency of the hydraulic turbine, the reduction of output and annual power generation, the shortening of maintenance intervals and the increase of costs, affecting the normal operation of the unit. For most mountainous rivers in Yunnan, the sediment content in the river channel is strongly affected by the seasons, the sediment particle size changes greatly, and the river trend has many bends. The constant one-dimensional uniform flow mathematical model cannot truly reflect the reservoir sediment deposition, and is not applicable to Yunnan. At the same time, it is important to analyze the reservoir sediment deposition change under the different years of water and sediment series. In this paper, the susbed-2 one-dimensional steady non-uniform sediment transport model developed by wuhan university of water conservancy and electric power is used to calculate and analyze the changes of sediment deposition in reservoirs in different years. The results show that:. (2) In 1998, the accumulated sediment deposition of water and sediment series was relatively large, while in 1992~2001, the accumulated sediment deposition of water and sediment series was relatively small, but their total sediment deposition was not far away, and the accumulated sediment deposition was generally increasing. (3) Compared with the results obtained under the water and sediment series from 1992 to 2001, the amount of sediment deposition is different due to the different amount of sediment entering the reservoir. However, after 2 to 3 years, the sediment discharge ratio under different water and sediment series is stable at more than 90%, with a variation range of 90% to 102%, and the reservoir is basically balanced. |
| Key words: hydropower station reservoir; water and sediment series; sediment transport model; sediment deposition change |
