Coastal vulnerability index aftermath tsunami in Palu Bay, Indonesia

Abstract A significant impact of the disaster has influenced a rapid growth of economics for the Palu City 2030 framework. Discovering coastal vulnerability index value is needed to measure tsunami affecting the vulnerability risk and evaluate development plan in 2010-2030. This paper used spatial analysis to estimate coastal vulnerability index (CVI) before and aftermath of the earthquake and tsunami. An assessment of CVI was carried out using seven physical parameters and integrated with the Analytical Hierarchy Process (AHP) to build into five categorized. The result has shown that there was an increased vulnerability risk from moderate to very high rank, where the total amount of area under pressure was 12.8 km2 (56.53%) and rose to 14,367 km2 (63.72%) after the tsunami hit. A coastal area of Ulujati-Mantikulore could be categorized into the very low risk-moderate class; meanwhile, along the region of West Palu, East Palu, North Palu, and Tawaili were indicated into the high-very high-risk class of vulnerability. This paper finding shows that it is needed a decision of policymaker on making a mid/long-term plan, and it should prioritize a precision disaster-based calculation to minimize the loss and damage by the disaster in the future.