By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Th...By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Then a mathematical model is used to reveal the influence mechanism on hydrodynamic characteristics and sediment transport of the wading engineering groups such as a tide gate, a breakwater, reservoirs, bridges and wharves, which were built in different periods. The results showed the hydrodynamic characteristics and sediment transport of the Yong River changed obviously due to the wading engineering groups. The tide gate induced deformation of the tidal wave, obvious reduction of the tidal influx and weakness of the tidal dynamic, decrease of the sediment yield of flood and ebb tide and channel deposition. The breakwater blocked estuarine entrances, resulting in the change of the tidal current and the reduction of the tidal influx in the estuarine area. The large-scale reservoirs gradually made the decrease of the Yong River runoff. The bridge and wharf groups took up cross-section areas, the cumulative affection of which caused the increase of tidal level in the tidal river.展开更多
曹娥江大闸口门船闸所在工程河段水文泥沙条件复杂,是兼具强涌潮、高含沙量、河床冲淤剧烈等特点的游荡型河段。针对高含沙量可能带来的闸下强淤积问题,通过曹娥江大闸闸下河床地形实测资料分析、冲淤现场试验、泥沙淤积计算等,总结河...曹娥江大闸口门船闸所在工程河段水文泥沙条件复杂,是兼具强涌潮、高含沙量、河床冲淤剧烈等特点的游荡型河段。针对高含沙量可能带来的闸下强淤积问题,通过曹娥江大闸闸下河床地形实测资料分析、冲淤现场试验、泥沙淤积计算等,总结河床冲淤规律,研究曹娥江大闸口门船闸水域河床稳定性等关键问题。根据现场冲淤试验分析,曹娥江大闸闸下115~200 m范围内在大潮淤积初期淤积速率为20.8~21.8 cm d,采用淤积经验公式计算得到口门船闸闸下淤积幅度可达17 cm d。对于闸下强淤积问题,提出蓄水冲沙池作为冲淤减淤方案,估算得到在蓄水冲沙池月均泄水量为813万m^(3)的情况下可使引航道河床维持约-1.7 m高程,为今后类似船闸的防淤减淤设计及科研提供参考。展开更多
基金financially supported by the National Science Foundation for Distinguished Young Scholars of China(Grant No.51125034)the National Natural Science Foundation of China(Grant Nos.51279046 and 50909037)the Fundamental Research Funds for the Central Universities(Grant No.2010B01114)
文摘By taking the Yong River for example in this paper, based on the multiple measured data during 1957 to 2009, the change process of runoff, tide feature, tidal wave, tidal influx and sediment transport are analyzed. Then a mathematical model is used to reveal the influence mechanism on hydrodynamic characteristics and sediment transport of the wading engineering groups such as a tide gate, a breakwater, reservoirs, bridges and wharves, which were built in different periods. The results showed the hydrodynamic characteristics and sediment transport of the Yong River changed obviously due to the wading engineering groups. The tide gate induced deformation of the tidal wave, obvious reduction of the tidal influx and weakness of the tidal dynamic, decrease of the sediment yield of flood and ebb tide and channel deposition. The breakwater blocked estuarine entrances, resulting in the change of the tidal current and the reduction of the tidal influx in the estuarine area. The large-scale reservoirs gradually made the decrease of the Yong River runoff. The bridge and wharf groups took up cross-section areas, the cumulative affection of which caused the increase of tidal level in the tidal river.
文摘曹娥江大闸口门船闸所在工程河段水文泥沙条件复杂,是兼具强涌潮、高含沙量、河床冲淤剧烈等特点的游荡型河段。针对高含沙量可能带来的闸下强淤积问题,通过曹娥江大闸闸下河床地形实测资料分析、冲淤现场试验、泥沙淤积计算等,总结河床冲淤规律,研究曹娥江大闸口门船闸水域河床稳定性等关键问题。根据现场冲淤试验分析,曹娥江大闸闸下115~200 m范围内在大潮淤积初期淤积速率为20.8~21.8 cm d,采用淤积经验公式计算得到口门船闸闸下淤积幅度可达17 cm d。对于闸下强淤积问题,提出蓄水冲沙池作为冲淤减淤方案,估算得到在蓄水冲沙池月均泄水量为813万m^(3)的情况下可使引航道河床维持约-1.7 m高程,为今后类似船闸的防淤减淤设计及科研提供参考。
