A Numerical Study of Overtopping Wave on Dike
In general, coastal areas have a coastal structure to provide protection against flooding due to waves and prevent erosion on the shoreline. In addition, high-velocity overtopping waves can cause serious damage ranging from building damage to fatalities in extreme cases. As the overtopping waves continuously hit the sea dike, the risk of structural failure will inevitably occur, therefore it is very important to study how the impact and characteristics of the overtopping waves on the dike. This research will analyze how the characteristics of the overtopping wave flow on the dike structure. Therefore, to understand further, this study will perform numerical modeling of the overtopping waves on the dike structure with the help of FLOW-3D software as a CFD software. The study is continued by collecting data of wave parameter and dike structure. The results are validated from previous studies and is repeated from geometrical modelling if the result is not suitable. This study provides 24 models consisted of 2 main variations such as wave parameter and structure parameter. These variations can be seen on the matrix below where each model are named in order. The structure model and wave parameter is adopted on the previous study by Chen et al. The greater the value of the steepness of the waves, the greater the velocity of the wave flow in the dike structure. The flow velocity in a structure with an angle of 9.5° has a greater maximum value when compared to the flow velocity of a structure at angles of 18.5 ° and 90°. An inverse relationship between Ho/gT^2 and Hi/L for each angle variation indicates the waves that occur are plunging waves and surging waves.