SPATIAL MODELING OF TSUNAMIS AND TSUNAMI INUNDATION ANALYSIS OF “PANJANG” BEACH IN BENGKULU CITY, INDONESIA

Abstract

Modeling the potential for tsunami inundation at tourist sites is required as a disaster mitigation effort. Spatial modeling through the application of Geographical Information System (GIS) is a method that can be used to assess the potential for inundation and the impact of a tsunami. This study aims to obtain a spatial description of the potential distribution of tsunami inundation in the tourist area of Panjang beach, Bengkulu City. Appropriate input parameters were derived from Digital Elevation Model (DEM) data, and satellite remote sensing and field data were analyzed through GIS. The slope parameter is derived from DEMNAS data belonging to the Geospatial Information Agency (BIG), land use is generated from open street map (OSM), and coastline distance created from vector map of the study area. The simulation of the tsunami height on the coastline using a scenario of 10 meters causes the land in the Panjang beach area to be inundated with an area of 1.4 – 3.5 km2 with a range of 415 – 765 meters from the coastline. The map of potential tsunami inundation resulting from spatial modeling provides the same inundation pattern as the tsunami inundation map issued by BNPB. The extent and range of the tsunami inundation are directly proportional to the height of the tsunami on the coastline, the higher the tsunami on the coastline, the wider the tsunami inundation, and the farther the tsunami range on the land. The results of this study can be used as initial information for the management of coastal areas as tourist sites related to disaster mitigation.

Keywords

• spatial modeling
• tsunami inundation
• demnas
• panjang beach
• bengkulu