THE GEOVISUALIZATION OF SETTLEMENT AND CATTLE DISTRIBUTION IN THE KRASAK RIVER, INDONESIA, POST THE 2010 MERAPI ERUPTION

Mount Merapi, one of Indonesia's active mountains, still has the potential to cause lahar flows. The spatial modelling of lahar flow can be done to determine the characteristics of lahar flow distribution and the area that can be affected through the integration with data on danger zone areas (known in Indonesian as Kawasan Rawan Bencana or KRB), the river network, and the historical lahar volume. Lahar flow modelling produces four classes of lahar volume scenarios, namely 125,000 m3, 250,000 m3, 500,000 m3, and 1,000,000 m3. The modelling results show that if the scenario of lahar volume with the highest flow class of 1,000,000 m3 occurs, the impact of lahar flow can reach the KRB I zone, which has the lowest hazard potential compared to KRB II and KRB III. This study aims to map the settlement and cattle distribution after the 2010 Merapi eruption through geovisualization, based on the results of lahar flow modelling. Geovisualization is processed from data such as the road network, the river network, the distribution of settlements, the distribution of evacuation sites, the population of each affected sub-district, the number of cattle, and the lahar flow modelling data around the Krasak River area, which is located on the border of Sleman Regency and Magelang Regency. The geovisualization results of settlement and cattle distribution are used to analyse distribution patterns, evacuation road networks, and the condition of the settlements and the cattle. Through geovisualization, valuable and easy-to-understand information will be presented related to lahar flow schemes, danger zone areas, the distribution of population and the cattle affected by the eruption, the distribution of settlements, the evacuation sites and cowsheds, and the routes to the evacuation sites. © 2025, Publishing House of the Romanian Academy. All rights reserved.