Analysis of lava flood risk distribution to support hazard mitigation

Abstract

Flood lava is a collection of lava released by the volcano and reaches the lower surface with the help or encouragement of rainwater. The impact of lava flooding has a high risk because the material it carries can cause damage and potentially cause death, injury, illness, life threatened, loss of security, displacement, damage or loss of property, and disruption of community activities. Mapping the risk areas for lahar floods by utilizing the Geographic Information System (GIS) can be useful to support disaster mitigation activities. The lahar flood risk map was generated from an overlay of the lahar flood hazard map, lava flood kerawana map, lava flood vulnerability map, and lava flood capacity map which had each parameter which was then calculated using the scoring method and classified based on its scoring value. From the results of processing, the lahar flood risk map can be classified into 3 classes, namely high risk, moderate risk, and low risk. High risk occurred in November, mostly occurred in the Pasirian District area, especially in the area around the river and a little in the river area Pronojiwo District, with a total area of risk area is 28.983 or with a percentage of 4.24% of the total area of the study area, and areas that have risks high in January many occurred in the Pasirian District area, especially in the area around the river with a total area of risk area is 9.570 or with a percentage of 1.40% of the total area of research.