Abstract
Seawalls are the most common form of coastal defence, they are the physical barriers between land and sea. They are parallel to the beach used to prevent overtopping and flooding due to storm waves. They can be constructed in the front or back of the shoreline. However, the front face of a seawall is subjected to high energy wave action, which can induce the problem of toe scour. Scours in front of the breakwaters and the seawalls have been investigated heavily in the past, but it still remains a concern for coastal engineers. In those previous studies, the sea bottom was considered as flat or having a very mild slope. These may not be valid for steep slope beach in front of a structure. The seawall stands in run-up region in this study. The seawall and the beach profile interaction was investigated by experimentally. The beach slopes were 1/5 and 1/10 in the experiments.
Highlights
There are many ways of protection against coastal erosion for coastal areas
The purpose of this study was to investigate the interaction of the vertical wall which was at the back of the shoreline and the beach profiles, and to investigate the toe erosion/deposition of seawall experimentally
An experimental study was conducted to investigate the scour/deposition at the toe of a vertical seawall placed behind the shoreline in run-up region on a 1:10 and 1:5 sloping beaches with a constant bed material under irregular wave attack
Summary
There are many ways of protection against coastal erosion for coastal areas. Breakwaters, groins and seawalls are a few of these methods. Seawalls are frequently used as coastal protection method to prevent overtopping and coastal flooding. Reflection of incident waves from vertical walls causes building of waves in front of the structure due to the increase of the orbital velocities. Toe scouring problem is thought to be the main cause of failure of a seawall rather than the structural design. Factors that affect the severity of toe scour include wave breaking, wave run-up, backwash, wave reflection, and the grain size distribution of the beach or bottom materials (Herbich, 1999). Effective scour protection is an essential part of the coastal structure design (Tsai, 2009)
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