高渗透性海床对波浪衰减作用的数值分析  

Numerical analysis of waves damping over high permeability seabed

作　　者：程永舟[1] 王永学[2] 陈智杰[2] 蒋昌波[1] 

机构地区：[1]长沙理工大学水利工程学院,长沙410076 [2]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：《大连海事大学学报》2008年第3期76-80,共5页Journal of Dalian Maritime University

基　　金：国家自然科学基金资助项目(50479015);教育部新世纪优秀人才支持计划资助项目(NCET-05-0710);湖南省重点学科建设资助项目;长沙理工大学创新团队建设计划资助

摘　　要：为研究高渗透性海床对波浪衰减的影响规律,建立了波浪与粗颗粒高渗透性海床相互作用的同步耦合数学模型.波浪域采用雷诺时均方程和k-ε紊流模型,采用PLIC-VOF法追踪波浪自由表面,采用非线性Forchheimer方程描述高渗透性海床内孔隙流场,计算分析海床参数对波高沿程衰减的影响.结果表明:随着海床厚度、粒径、孔隙率、固有渗透率的增大,沿程波高衰减加快;但当海床厚度达到1.8倍水深后,对沿程波高衰减基本没有影响;孔隙率增大到0.65后,沿程波高衰减幅度反而减小.A coupling model of wave interaction with high permeability seabed was established to study waves damping over high permeability seabed. The wave field solver was based on two dimensional Reynol＆ Averaged Navier-Stokes （RANS） equations with a k - ε closure. A piston-type wave maker was set up in the computational domain to produce incident waves and the free surface was traced through the piecewise linear interface construction-volume of fluid （PLIC-VOF）. Forchheimer Equations were adopted in the high permeability seabed. The numerical tests were conducted to study the effects of seabed parameters on waves damping. Results show that wave damping rate increases with the increase of seabed thickness, particle diameter, porosity and intrinsic permeability. As the porous bed depth increases to 1.8 times the water depth, the further increase of the porous bed depth has no apparent effect on the wave damping rate. Furthermore, as the porosity increases to 0.65, the further increase of porosity results in a decrease of the wave damping rate.

关 键 词：高渗透性海床 波浪衰减 耦合模型 

分 类 号：P731.2[天文地球—海洋科学]