规则波作用下淤泥质泥沙起动试验研究  

Experimental study on incipient motion for muddy sediment by regular waves

作　　者：邵杰[1] 张芝永[1] 董伟良 黄世昌[1] 汪求顺 SHAO Jie;ZHANG Zhi-yong;DONG Wei-liang;HUANG Shi-Chang;WANG Qiu-shun(Zhejiang Institute of Hydraulics & Estuary,Key Laboratory of Estuary and Coast of Zhejiang Province,Hangzhou 310020,China)

机构地区：[1]浙江省水利河口研究院浙江省河口海岸重点实验室

出　　处：《水运工程》2019年第8期20-26,共7页Port & Waterway Engineering

基　　金：浙江省自然科学基金项目(LQ16E090004);国家自然科学基金项目(51609214,41706099);浙江省科技计划项目(2018F10026)

摘　　要：选取浙江舟山近岸淤泥质泥沙为研究对象,采用规则波对淤泥质泥沙的起动进行水槽试验研究。结果表明,淤泥质泥沙具有薄层轻微悬扬、表层个体剥离、泥团卷起悬扬3种典型的起动状态,同一水深下的泥沙起动波高随波周期的增大而递减。以泥团卷起悬扬状态作为判断淤泥质泥沙起动的标准,佐藤公式、窦国仁公式计算的起动波高均与本文试验值总体上接近,可将两家公式计算结果的平均值用于淤泥质泥沙起动波高的估算。泥团卷起悬扬状态下过程最大含沙量往往在0.8~2.0kgm3,过程最大含沙量随临界切应力增大而呈现明显的指数递增关系。研究成果便于深入了解淤泥质海岸地区泥沙在波浪环境下的水力特性,同时可为海岸泥沙数模计算及工程分析的参数选取提供参考。Taking the muddy sediment nearshore of Zhoushan city in Zhejiang Province for example,a flume experiment by regular waves is carried out on the incipient motion for the muddy sediment.The results indicate that muddy sediment has three states of incipient motions,i.e.,slight suspension of thin layer,individual exfoliation of surface layer,as well as roll up and suspension of the mud.The threshold wave height decreases with the increase of the wave period under the same water depth.Taking the state of roll up and suspension of the mud as the criteria for the incipient motion of muddy sediment,experimental values of the threshold wave height are close to the calculated values by the formula of Misaki Sato and Dou Guoren,thus the average of the calculated results by the two formulae can be used for estimating the threshold wave height of muddy sediment.With the state of roll up and suspension of the mud as the criteria for the incipient motion of muddy sediment,the maximum of the processing sediment concentration is often between 0.8 and 2.0 kg m 3,and the maximum of the processing sediment concentration shows an exponential increasing relation with the increase of the critical shear stress by waves.The results of this research can be used to explore the hydraulic characteristics of sediment in muddy coastal areas,and provide reference for the numerical simulation of coastal sediment and parameters selection for the engineering analysis.

关 键 词：规则波 淤泥质泥沙 起动 试验研究 

分 类 号：TV139[水利工程—水力学及河流动力学] TV141