引用本文:罗全胜,谢龙.三峡水库175 m方案成库运行后龙门浩河段水流特性变化分析[J].水利水运工程学报,2014,(1):98-102
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 836次   下载 1024 本文二维码信息
码上扫一扫!
分享到: 微信 更多
三峡水库175 m方案成库运行后龙门浩河段水流特性变化分析
罗全胜1,2, 谢龙3
1.小流域水利河南省高校工程技术研究中心;2.黄河水利职业技术学院;3.江苏省交通科学研究院股份有限公司
摘要:
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。
关键词:  龙门浩河段  175m方案  水流特性  平面水流二维数学模型  库区特性
DOI:
分类号:TV147
基金项目:国家自然科学基金资助项目(50579041)
Analysis of flow characteristics of Longmenghao reach after the Three Gorges Reservoir impoundment to 175 m height
LUO Quan-sheng1,2, XIE Long3
1.University Engineering Technology Research Center of Small Watershed Conservancy of Henan Province;2.Yellow River Conservancy Technical Institute;3.Jiangsu Transportation Institute
Abstract:
This article is based on the topography, hydrology and sediment data measured by the Upper Yangtze River Waterway Bureau after the impoundment of the Three Gorges Reservoir to 175 m height to study the change of the streamwise backwater effect with the aid of the SMS of a planar 2D mathematical model. The change of the Longmenghao reach flow before and after the impoundment is analyzed, and the analysis results show that: (1) after the impoundment in non flood season, the river reach in the reservoir has the characteristics that the tail water is too high, flow velocity, water surface slope and water power have fallen sharply; and that in the flood season, the reach becomes natural just as that before the impoundment; (2) the average flow rate is taken to represent the average of the hydraulic factor condition; under the same flow before and after the impoundment, the Longmenhao reach flow simulation of different periods is compared, showing that the change amplitude of hydraulic factors in impoundment period is the largest, that in storage period is smaller, that in drawdown period is the smallest, and that in the flood season has no change; (3) weighted estimation shows that after the impoundment within the first year, the average stream power reduces by 47.9% compared with that before impoundment, and at the same time, the stream power yearly change distribution is extremely uneven, which will lead to big changes in sediment transport in the reach.
Key words:  Longmenghao reach  175 m scheme  flow characteristics  2D mathematical model  reservoir characteristics
手机扫一扫看