Evaluating of Coastal Erosion Status from CEMP results in Eastern Coast, South Korea

초록

The Gangwon province, which is located in the mid-eastern part of the Korean Peninsula, started the Coastal Erosion Monitoring Program (CEMP) on 2006 and has been currently progressing. The CEMP in the eastern coast of Gangwon province is carried out in all the 41 littoral drift cells. In this study, we compared and evaluated a level of beach erosion based on the four years CEMP results. The indicators for coastal erosion evaluation in South Korea are consists of the beach width change (40 points), the beach area change (30 pts), the hinterland risk vulnerability (20 pts), the population (5 pts) and the nature conservation value (5 pts). The coastal erosion levels from the absolute evaluation point by the indicators were separated four phases through the A phase (stable, and well preserved beach with over 90 evaluation indicator points), the B phase (occurred an accretion or erosion, but relatively stable beach with 70 similar to 89 pts), the C phase (damage on beach or hinterland caused from erosion will be appeared, and with 50 similar to 69 pts), and the D phase (occurring heavy damage on beach or hinterland by continuous erosion with below 50 pts) on the 41 littoral drift sectors, which are including 79 beaches. The evaluation result shows that a serious erosion phenomenon in the eastern coast area of Korea has been increasing. Especially, the eroded beach sectors with the C and D phase were extremely increased in 2014 (A=0, B=18, C=47, D=14), compared with the monitoring result in 2010 (A=5, B=26, C=31, D=17).

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