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Abstract
The construction of large-scale coastal structures in any coastal area may not only have direct effects on the coastal environment in that vicinity but also cause severe property damage. In order to prevent this problem, probable effects should be appreciated before any construction and the mechanism that may cause any probable damage must be accurately analyzed along with the plans to minimize damage. This study sought to analyze the cause and mechanism of damage inflicted on coasts by artificial structures through reviewing beach erosions that have occurred on beaches on the east coast of Korea after the large-scale construction of artificial structures, for which wave heights were measured in the vicinity of those structures, and the correlation between the measurements and the analysis data of waves and coastal erosion on the surrounding beach was analyzed. In addition, the correlation between coastal erosion and wave data was applied in order to understand what impact large waves have in relation to sand loss. Accordingly, a movable-bed physical model test was employed to appraise the factors that cause coastal erosion to take place.
Highlights
The Korean east coast is about 223 km long and the coastline is fairly uniform in character, with pine forests and sandy beaches together forming a pleasant environment
The erosion mechanism, which occurred due to the wave concentration and the long-shore current change in the back side of the structure when an erosive wave was deformed by a coastal structure, was analyzed
The data analysis revealed that the incident waves toward the coast increased in autumn and winter compared to spring and summer, and the appearance rate of wave heights over 3 m increased
Summary
The Korean east coast is about 223 km long and the coastline is fairly uniform in character, with pine forests and sandy beaches together forming a pleasant environment. One location where erosion is taking place as a result of the large-scale construction of a harbor facility on the east coast of Korea was selected and field investigation was conducted to understand how the construction of artificial structures brings about changes in the coastal environment. The heights of waves were measured in the observation field, and the correlation between the coastal erosion taking place in the surrounding beaches and analyzed data on waves was estimated. From the correlation between coastal erosion and wave data, the significant wave data that cause sand loss were derived, and a hydraulic model experiment was carried out on the target coast. The causes and reduction method for currently occurring coastal erosion were examined
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