Determination of Coastal Setback for Sea Level Rise Adaptation
Keywords:
Coastal setback, Sea level rise, Bruun’s modelAbstract
This study aims to determine the coastal setback of Thailand for shoreline change in 2100 B.E. Research areas, comprising Mae Ramphueng Beach, Chalatat Beach, and Karon Beach. Coastal setback determine by examining the processes of short-term and long-term shoreline change, together with erosion from sea level rise. The results identified that the setback in RCP 8.5 of Mae Ramphueng Beach is 1.26 to 3.02 m., Chalatat Beach is 42.27 to 44.77 m., and Karon Beach is 277.95 to 280.98 m. The estimation of beach value and B/C ratio evaluation identified that Mae Ramphueng and Chalatat beaches are worth the investment setbacks at RCP 2.6 because the B/C Ratio is 2.06 and 1.08, respectively. Karon Beach is not worth in terms of economics because of this area has an abundance of permanent buildings. Thus, the compensation cost for setback will be high. It can conclude that highly developed beach area would be challenging to apply the setback practically. However, it can reduce the impact of sea level rise and damage to structures along the coast if we managed together the town planning with setback to regulate or limit the development enclose to the coast. It can apply the results as a guideline for determining coastal setbacks, which is one measure for managing coastal areas of Thailand in the future.
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