海岸破波带内水底悬沙浓度形成机理实验研究  

Experimental study on the formation mechanism of bottom suspended sediment concentration in surf zone

作　　者：张洋[1] 邹志利[1] 薛武山 孙大鹏[1] ZHANG Yang;ZOU Zhi-li;XUE Wu-shan;SUN Da-peng(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《海洋通报》2018年第2期181-191,共11页Marine Science Bulletin

基　　金：国家自然科学基金(51079024)

摘　　要：通过大尺度水槽波浪引起泥沙悬移的动床模型实验,研究了沙坝海岸破波带内水底悬沙浓度形成机理,通过比较时间平均水底悬沙浓度与时间平均水底波浪水质点动能或时间平均水底湍动能之间的相关性,论证了利用时间平均湍动能比利用时间平均波浪水质点动能计算时间平均水底悬沙浓度更为适用,并提出了以上时间平均水底悬沙浓度与水底湍动能之间的关系也可以用来近似表达时间变化的水底悬沙浓度与时间变化的水底湍动能之间的关系。研究针对规则波、波群和不规则波3种波浪形态进行,并分别对破波带内的爬坡区、内破波区和沙坝区3个区域实验结果进行讨论。To study the formation mechanism of bottom suspended sediment concentration in surf zone,a series of experiments were conducted in a large scale wave flume for the wave conditions of regular wave,wave group and irregular wave.The correlation of bottom suspended sediment concentration with the wave kinetic energy or the turbulent kinetic energy near bottom are examined.The results show that the bottom suspended sand concentration which can be calculated in terms of the pick-up function correlates better to the turbulent kinetic energy at bottom,which contain both the wave breaking effect and bottom boundary turbulent flow effect,than to the kinetic energy of wave flow,which is a representation of the bottom shear stress.Based on this result,the superiority of the formula for the bottom concentration in terms of wave energy dissipation to that in terms of bottom shear stress is verified.

关 键 词：破波带 波浪形态 悬沙浓度 湍动能 沙坝 

分 类 号：TV149.2[水利工程—水力学及河流动力学]