波浪作用下细颗粒泥沙起动试验研究  

Experimental study on incipient motion of fine sediment under waves

作　　者：孔令双 徐斌 陆佳 贾晓 KONG Lingshuang;XU Bin;LU Jia;JIA Xiao(Estuarine & Coastal Science Research Center, Shanghai 201201, China;Estuarine & Coastal Engineering Survey and Design Co., Ltd., Shanghai 201201, China)

机构地区：[1]上海河口海岸科学研究中心,上海201201 [2]上海河口海岸工程勘测设计有限公司,上海201201

出　　处：《海洋工程》2020年第4期73-80,共8页The Ocean Engineering

基　　金：国家重点研发计划项目(2017YFC0405400);国家自然科学基金项目(41206072)。

摘　　要：长江口北槽中下段滩面泥沙以粉砂和极细砂为主,在风浪条件下极易起动,形成近底高浓度含沙层,成为航道淤积的重要泥沙来源。采用长江口北槽中下段滩面现场泥沙,进行了波浪作用下泥沙的起动试验研究。试验结果表明:相同水深条件下,波浪周期越长,泥沙的起动波高越小;相同波浪周期条件下,水深越大,泥沙起动波高越大;对于自然密实1天的泥沙,波浪作用下的起动临界剪切力平均约为0.325 N/m^2。本次试验结果和已有的波浪起动公式计算结果以及已有的试验结果进行了比较分析,结果均比较一致。Silty sand and fine sand are the main sediment in the middle and lower section of the North Passage of theYangtze River estuary.Under the wind-wave action,the high concentration layer near the bottom is formed with the incipient motion of sediment.In this study,the threshold experiment of fine sediment under wave action is carried out.Test results show that under the same water depth,the threshold wave height decreases with the increases of the wave period.Under the same wave period,the threshold wave height increases with the increases of the water depth.For the sediment compacting for one day,the threshold shear stress under wave action is about 0.325 N/m^2.

关 键 词：长江口 细颗粒泥沙 波浪水槽试验 泥沙起动 

分 类 号：TV148[水利工程—水力学及河流动力学]