| 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,2022,41(S2):105-109. |
| HUO Yuguo,HONG Zhenguo,LI Jianwei.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,2022,41(S2):105-109. |
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| 摘要: |
| 泥沙淤积会引起库区水位抬高，侵占调节库容，造成库容损失，降低水库的调节能力。针对云南省大多数山区河道中泥沙量受季节影响强、泥沙粒径变化幅度大、河流走向弯道多、恒定一维均匀流数学模型不能真实反映水库泥沙淤积的情况。因此，本研究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不同年份水沙系列下水库泥沙淤积变化。结果表明，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为坝前，泥沙淤积发展速度较快的时段主要是第1年，此后水库泥沙淤积速度逐渐变慢。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，泥沙累计淤积量总体呈增加趋势。与1992—2001年相比，1998年水沙系列由于入库沙量不同，淤积量也有所不同，历时2~3 a后，不同水沙系列下的排沙比均稳定在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：10.13522/j.cnki.ggps.2022607 |
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| 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 Zhenguo, LI Jianwei
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Yunnan Water and Hydropower Engineering Investigation, Design and Research Institute, Kunming 650021, China
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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: 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. 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 2~3 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 |
