新孟河感潮河段支流口门闸下极限冲刷试验研究  

Experimental study on ultimate scour at downstream of sluice gate at an estuary outlet of Xinmeng River

作　　者：何勇 朱昊[2] 邵勇 杭丹 HE Yong;ZHU Hao;SHAO Yong;HANG Dan(Taihu Treatment Project Construction Administration,Wuxi214183,China;Nanjing Hydraulic Research Institute,Nanjing210029,China)

机构地区：[1]江苏省太湖治理工程建设管理局,江苏无锡214183 [2]南京水利科学研究院,江苏南京210029

出　　处：《人民长江》2018年第4期83-88,共6页Yangtze River

基　　金：国家重点研发计划项目(2017YFC1404200);水利部技术示范项目(SF-201705);国家自然科学基金项目(51379127,51509168)

摘　　要：感潮河段支流口门外江侧水流受涨落潮牵制作用明显,水流流态复杂,为保证河道堤防安全,避免在大流量引、排水时河道严重冲刷,危害临近建筑物,对闸下冲刷展开研究十分必要。以新孟河延伸拓浚工程界牌水利枢杻为例,构建1:50物理模型开展试验,结果表明:若新开河被开挖至粉砂层,由于粉砂起动流速较小,极易被水流冲起造成河道严重冲刷;由于水流在软硬介质边缘处会产生漩涡,不停的淘刷坑底,使冲刷坑不断加深,所以在进行建筑物护底设计时,应全河段宽度范围内进行防护;根据感潮河段水流受涨落潮牵制作用的水动力特征,可以有针对性的对主流路上冲刷较为严重的区域建筑物进行防护。The branch exit flow at tidal river is significantly affected by high and low tide,and the flow pattern is complex.It is necessary to study the scouring condition under the sluice gate that is located at the estuary outlet of a branch tidal river,so as to prevent severe river erosion and avoid the damage to the adjacent buildings when conducting diversion or drainage of large flow.In this paper,taking Jiebei water conservancy engineering on Xinmeng River as a case,a1:50physical model was built to carry out a series of tests.The test results show that it is easy to cause serious scouring to the channel bed of Xinkai River,a tributary of Xinmeng River,if it is dug into the silty sand layer that has low incipient velocity;as the current generates vortexes at the edge of soft and hard media and it continually scour the bottom of the pit,a series of measures should be taken to protect the river bed in whole width of the river;the building protection design can mainly aim at the severe scouring area on the mainstream pass according to the hydrodynamic characteristics of the tidal flow.

关 键 词：口门区 极限冲刷 物理模型试验 感潮河段 

分 类 号：TV691[水利工程—水利水电工程]