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-  2018 

水库非均匀沙恢复饱和系数特性 Characteristics of nonuniform sediment recovery saturation coefficient of reservoir

Keywords: 恢复饱和系数,非均匀沙,超饱和输沙,三峡水库

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Abstract:

非均匀沙恢复饱和系数是泥沙数学模型计算的重要参数,其取值合理与否将直接影响到数学模型计算成果的可靠性.目前针对泥沙恢复饱和系数已开展大量理论研究,但对其取值与变化规律尚缺乏一致结论.依据三峡水库库区实测水沙资料,通过分析超饱和输沙状态下库区泥沙含沙量的下包线得到了近似分组挟沙力,基于一维恒定流不平衡输沙方程推求了水库非均匀沙恢复饱和系数,分析了其随重力作用、水动力条件的变化特性,并建立了超饱和输沙条件下水库非均匀沙恢复饱和系数计算公式.研究结果表明,水库非均匀沙恢复饱和系数受重力作用与水流紊动作用共同影响,取值范围可达0.01~10,随粒径的增大而减小,并且与悬浮指标具有良好的负相关关系

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