การระบุแนวชายฝั่งด้วยชุดเครื่องมือ CoastSat พื้นที่ศึกษาหาดท่องเที่ยวจังหวัดภูเก็ต

Abstract

Coastal zones have many varieties of land uses. Not only the increasing rates of sea level rise and more intensity and frequency of storm surge because of climate change but also annually beach erosion is another important factor to consider for protecting the coast from damage. Especially, the tourism beach that has high economic value. Then, shoreline detection is the key parameter to analyze the coastal processes. It is necessary to use aerial photo or satellite image in the shoreline detection process, but most of them are not open-access data. The aim of this study is to analyze the shoreline changes of tourism beaches located in the western part of Phuket Island, Thailand. The shoreline position in this study was detected by CoastSat toolkit, which has API to access with Google Earth Engine. CoastSat uses the image classification method to consider the shoreline position automatically by using open-source satellite images from 2013 to 2021 analysis period to address the limitations associated with accessing data sources. The result showed that 8 study locations face erosion problem with the rates from -0.96 to -4.10 m/yr. This result can be implemented for decision making the appropriate adaptation plan in the future.