Ambang Batas Curah Hujan di Kaldera Bawakaraeng, Sulawesi Selatan

Abstract

A large scale landslide occurred on March 26, 2004 at Bawakaraeng caldera of South Sulawesi is considered as one of the worst sediment disasters in Indonesia. The volume of the landslide was about 232 million m3. The landslide was caused by the collapse of the walls of the caldera leading to a flow of a large amount of debris with significant damages including 32 people lost their lives and destruction of properties. Since then the environmental hazard has been threatening till now. In addition, the unstable deposited sediment and further collapse of the caldera may lead to a large-scale landslide and debris-flow in the future. The objective of this study is to determine rainfall thresholds for sediment disaster in the Bawakaraeng caldera. Thirteen landslides including debris flows occurred after the large scale landslide were studied to analyze rainfall thresholds. The threshold rainfall for sediment disaster is
very important information for the development of warning systems in the study area.