抄録
Lahar, which is a wet mass of volcanic fragments flowing rapidly downhill, is a secondary disaster that occurs frequently during rainy season in 13 rivers of Merapi volcanic area. While the relationship between lahar and rainfall variability has been well understood, most lahar simulators used for this area tend to neglect rainfall variability as one of the inputs. HyperKANAKO, a debris flow simulator equipped with a graphical user interface (GUI), was designed to perform debris flow calculations based on its physical mechanism. The main purpose of this study is to analyze HyperKANAKO model's sensitivity when it is run on digital elevation models (DEMs) with three different resolution levels. Additionally, rainfall data from two different days measured in the Gendol catchment area were used. The results of these simulations showed that one-dimensional (1D) flow were more affected by rainfall than DEM quality, while two-dimensional (2D) lahar flow was best simulated using the finest resolution model.
