SPATIAL ANALYSIS OF THE TAEAN SHORELINE CHANGE USING SATELLITE IMAGE AND GIS

摘要

This research aims at analyzing the changes of erosion and sedimentation of coastal environment in quantity by exploring transition of the coastal line with Aviation LiDAR and KOMPSAT-2 satellite image. Also, ArcGIS based DSAS (Digital Shoreline Analysis System) program is applied to analyze the annual changes of the coastal line especially for the year of 2009, 2010 and 2012 compared to 2007. The coastal line in 2007 and 2012 was extracted by manufacturing DSM (Digital Surface Model) with Aviation LiDAR materials. For the coastal line in 2009 and 2010, NDVI (Normalized Difference Vegetation Index) method was used to extract the KOMPSAT-2 image selected after considering tide level and wave height. The change rate of the coastal line is varied in line with the forms of the observation target but most of topography shows a tendency of being eroded as time goes by. Among the costal topography, sands and silts experienced the most changes. The changes in artificial structure and rocks were meager but it was analyzed that the errors in these topography were significant. This is that in light of the character of Taeanbando (Taean Peninsula), pebbles and rocks have very complicated formation compared to relatively simple beach. It also has a prominence over an open sea like a cape. Accordingly, it is considered that corrections are needed in these areas. Likewise, it is evaluated that the sedimentation and erosion phenomenon of the coastal area will be aggravated. The changes of the coastal line have plenty of parameters due to several reasons like climate and changes of sea level. So, it is expected that analyzing the tendency of moving the coastal line could be a ground of a process to draw up a suitable coastal line management policies that can respond to the changes of coast topography in the future.