Wave Attenuation due to Stratified Porous Structure with Stepped Seabed  

阶梯海床上分层多孔结构对波浪衰减的影响

作　　者：Ashna Varghese K.R.Athul Krishna D.Karmakar 

机构地区：[1]Department of Water Resources and Ocean Engineering,National Institute of Technology Karnataka,Surathkal,Mangalore-575025,India

出　　处：《哈尔滨工程大学学报(英文版)》2024年第4期844-866,共23页Journal of Marine Science and Application

基　　金：Science and Engineering Research Board(SERB),Department of Science&Technology(DST),Government of India for supporting financially under the research grant No.CRG/2018/004184;Ministry of Ports,Shipping and Waterways,Government of India through the research grant No.DW/01013(13)/2/2021.

摘　　要：The wave interaction with stratified porous structure combined with a surface-piercing porous block in a stepped seabed is analysed based on the small amplitude wave theory.The study is performed to analyse the effectiveness of partial porous structure in increasing the wave attenuation in the nearshore regions consisting of stratified porous structures of different configurations using the eigenfunction expansion method and orthogonal mode-coupling relation.The hydrodynamic characteristics such as wave reflection coefficient,transmission coefficient,dissipation coefficient,wave force impact and surface elevation are investigated due to the presence of both horizontally and vertically stratified porous structures.The effect of varying porosity,structural width,angle of incidence,wavelength and length between the porous block and stratified structure is examined.The numerical results are validated with the results available in the literature.The present study illustrates that the presence of the stratified structure decreases wave transmission and efficient wave attenuation can also be easily achieved.The wave force acting on stratified structure can be decreased if the structure is combined with wider surface-piercing porous blocks.Further,the presence of stratified porous structure combined with porous block helps in creating a tranquil zone in the leeside of the structure.The combination of vertical and horizontal stratified porous structure with surface-piercing porous block is intended to be an effective solution for the protection of coastal facilities.

关 键 词：Stratified porous structure Surface-piercing Porous block Stepped seabed Eigenfunction expansion method Wave force 

分 类 号：P73[天文地球—海洋科学]