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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
Spatial-based Analysis for Coastal Risk Area Change along the Coast of Thailand
Siriluk Prukpitikul, Varatip Buakaew, and Nuttorn Kaewpoo
Geo-Informatics and Space Technology Development Agency (Public Organization), Thailand
Abstract: This spatial-based analysis for coastal risk area change along the coast of Thailand aims to investigate and monitor coastal erosion, create a coastal zone change map for the entire country at scale 1:100,000 and provincial maps(including risk analyses) at scales 1:50,000 and 1:25,000, and implement a coastal geo-database for long-term coastal zone management. Key activities included the following: (1) shoreline and land use analysis using medium- and high-resolution satellite images taken during 1999-2010; (2) collection of field data such as DGPS/GPS data, land use survey, and oceanographic data; and (3) implementation of a coastal geo-database and distribution data via the Internet. Coastal zone observations in 2009-2010 revealed that the coast of Thailand eroded by 18.06 km2 and accreted by 2.60 km2. The most heavily eroded areas were in Pattani, Trad, and Nakornsrithamarat provinces, with losses of coastal land of 2.65 km2, 2.24 km2, and 1.80 km2, respectively. The largest areas of accretion were in Prachuapkhirikhan, Chumporn, and Pattani provinces, with increases in coastal land of 0.55 km2, 0.48 km2, and 0.25 km2, respectively. In addition, a comparison among 23 provinces found the highest erosion rates in Samutprakarn, Samutsakorn, and Bangkok provinces, with land loss rates of 15.92 m/yr, 9.94 m/yr, and 8.48 m/yr, respectively, and the highest accretion rates in Samutprakarn, Bangkok, and Nakornsrithamarat provinces, with land accretion rates of 22.56 m/yr, 14.26 m/yr, and 12.88 m/yr,
respectively. The distribution of coastal information was disseminated via GISTDA Coastal Map (GCOS), which users can access at http://ocean.gistda.or.th.
Key words: spatial-based analysis, coastal risk area change, coast of Thailand
