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Analysis of flow characteristics of Longmenghao reach after the Three Gorges Reservoir impoundment to 175 m height
Author(s): 
Pages: 98-102
Year: Issue:  1
Journal: Hydro-Science and Engineering

Keyword:  Longmenghao reach175 m schemeflow characteristics2D mathematical modelreservoir characteristics;
Abstract: 基于长江上游水文局实测地形、水文、泥沙资料,针对三峡大坝175 m方案蓄水后对变动回水区产生壅水影响,借助SMS平面水流二维数学模型,对成库前后龙门浩河段水流特性变化进行了研究分析.研究结果表明,成库后非汛期内,该河段呈库区特性,尾水抬高,流速、水面比降、水流功率大幅下降,汛期河段恢复天然河道,水流特性与成库前一致.取各时期平均流量下的水流特性代表各时期水力因子的平均值,通过成库前后各时期相同流量下龙门浩河段水流特性模拟对比,发现蓄水维持期水力因子的变幅最大、蓄水期次之、消落期最小、汛期则不发生变化.通过加权估算,成库后年内平均水流功率较成库前下降47.9%,同时由于水流功率的年内变化分布极不均匀,将导致河段输沙规律发生变化.
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