| Title |
A Study on Beach Stabilization by Laying Drainage Layer |
| Keywords |
drainage layer;ground-water level;foreshore;LES-WASS-3D(3-D numerical simulation);beach stabilization;swash zone;투수층;지하수위;전빈;3차원 수치해석기법;해빈안정화;포말대 |
| Abstract |
The aim of this study is to survey the effects of laying drainage layer in sandy beach on beach stabilization. At first, the numerical model developed by Hur and Lee (2007), which is able to consider the flow through a porous medium with inertia, laminar and turbulent resistance terms, i.e. simulate directly WAveㆍStructureㆍSeabed/Sandy beach interaction and can determine the eddy viscosity with LES turbulent model in 3-D wave field (LES-WASS-3D), is validated by comparing with existing experimental data. And then, numerical simulation is carried out to examine the characteristics of wave-sandy beach interaction for a beach with/without drainage layer. From the numerical results, it is shown that mean ground-water level around a foreshore decreases and offshore-ward flow over a seabed reduces in case of a beach with drainage layer. Moreover, the effects of cross profile of drainage layer and incident wave condition on mean ground-water level around a foreshore are also discussed as well the distribution of wave setup around the foreshore. |