Risk mapping and tsunami mitigation in Gunungkidul area, Yogyakarta

Abstract

Coastal area of Gunungkidul Regency is one of the areas prone to tsunami in Indonesia. In contrary, currently, this area is very intensively developed as one of the favourite tourism destination. This paper is aimed at explaining tsunami risk and a mitigation type in Gunungkidul Area, Yogyakarta. Digital elevation model (DEM) and coastal morphology were used to generate tsunami hazard map. Vulnerability was analysed by utilizing land use data. Information from previous studies (e.g. from GTZ) were also considered for analysis. Tsunami risk was classified into three classes, i.e. high risk, medium risk, and low risk and visualized in the form of tsunami risk map. Tsunami risk map is a tool which can be used as disaster reduction instrument, such as for evacuation routes planning. Based on the preliminary results of this research, it is clear that tsunami risk in this area is varied depend on the morphological condition of the location. There are five coastal area selected as the location, i.e. Ngrenehan, Baron, Sepanjang, PulangSawal, and Sadeng. All locations have the high risk zone to tsunami, especially for bay area. Evacuation routes were generated for all locations by considering the local landscape condition. There are several differences of evacuation ways for each location.