破碎波作用下粉沙悬移质浓度垂向分布的实验研究  

Experimental study on fine sediment concentration under breaking waves

作　　者：韩鸿胜[1] 李世森[1] 赵群 赵冲久 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]交通部天津水运科学研究所,天津300456

出　　处：《泥沙研究》2006年第6期30-36,共7页Journal of Sediment Research

基　　金：交通部重点科技项目(No.200431922421);国家自然科学基金(No.50579024);天津市自然科学基金(No.043605411)

摘　　要：通过水槽实验对破碎波作用下驴驹河粉沙和黄骅粉沙悬沙浓度的沿程分布和垂向分布进行了研究,并对实验现象进行了初步分析。实验中发现:在波浪破碎前近底有高浓度含沙水体层,而在波浪破碎后高浓度含沙水体层消失;断面平均悬沙浓度在破碎点附近达到最大,在破碎点前,断面平均悬沙浓度沿程增大,而在破碎点后,断面平均悬沙浓度沿程减小;在波浪破碎前附近,上层水体紊动较强,从而悬起比平坡情况下更多的泥沙,使悬沙浓度不但在下层水体高,而且在上层水体也较高,因此在计算泥沙输移时,应对此更加注重。A flume experiment was carried out to investigate the distribution of the suspended sediment concentration under the breaking waves. The sediment sourees come from the Luju River and Huanghua harbor, respectively. In the experiment, a high concentration layer before wave breaking was found, but this layer is disappeared after wave breaking. The average suspended sediment concentration becomes higher along with the flume before the wave breaking point, but lower along with the flume after the wave breaking point. Just before wave breaking, the eddy intensity is higher which can suspend more sediment into the higher layer, so the suspended sediment concentration is higher along the whole water depth which should be paid more attention when computing the sediment transportation.

关 键 词：粉沙 垂向分布 悬沙浓度 破碎波 

分 类 号：TV142[水利工程—水力学及河流动力学]