潮汐河段主动式钩连体消能护滩效果现场观测分析

Field measurement and analysis of the active connected hook's energy dissipation and beach protection effect in tidal reaches

针对主动式钩连体消能护滩效果问题,对结构物抛设前后内部滩面高程变化、抛投试验区及周边水域流速变化及近底紊动强度、含沙量、底质颗粒级配变化进行了分析研究。对比分析表明,主动式钩连体的消能护滩效果较佳。得出如下结论:1)主动式钩连体减弱了抛投区内部水流强度且有整体阻水分流效果;2)抛投区域近底粗颗粒泥沙活动强度明显减弱,沉积环境向淤积方向转变;3)历经一次枯季水文过程、一次洪季水文过程后,抛投区内发生了全面淤积,平均淤高0.48 m。

For the problem of the active connected hook＇s energy dissipation and beach protection effect ,weanalyze the beach height changes ,changes of flow rate in casting test area and surrounding waters ,near bottomturbulence intensity sediment concentration ,gradation change of sediment particles before and after being casted.The comparative analysis shows that the energy dissipation protection of active connected hook is better. Thefollowing conclusions are drawn ： 1 ） The active connected hook has reduced the flow strength in the casting area andhas the overall effect of blocking water diversion.2 ） The activity intensity of coarse sediment near bottom is obviouslyweakened ,and depositional environment changes to siltation.3） After the hydrological process of a dry season and thehydrological process of a flood season the total deposition occurred in the casting area with an average of 0.48 m.