| Abstrak/Abstract |
Merapi Volcano, which differs from volcanoes in other climates due to its location on the Indonesian the slope, total rainfall, flflow density, soil type, and land cover analyzed with the multiti-criteria GIS analysis Maritime Continent influenced by ENSO, ICTZ, and Moonsons, plays an essential role as a source of were used. The results showed that the locatition had low, medium, and high risks. It was found that areas with groundwater for the surrounding population. Some problems associated with groundwater in Mount Merapi are high, prone, medium, and low risk class are 1,515.95 ha, 30,194.92 ha, 21,953.80 ha, and 3.14 ha, respectively. high utilization compared to other volcanoes worldwide, changes in land use, pollution, and its lowering table. These findings implied that the GIS approach and multi-criteria analysis are effective tools for flood risk maps Therefore, this study aims to compare the hydrogeological characteristics and aquifer systems of the southern and southeastern parts of Merapi Volcano. The hydrogeological characteristics were obtained from geological mapping, surface and subsurface, as well as rock XRF tests. Meanwhile, the hydrogeochemical characterization was determined through chemical data using the trilinear Piper, Kurlov, Fingerprint, and Composition Diagram methods show that Mount Merapi has 3,7, 4 and 2 types of pattern different from other volcanoes in the world. On the other hand, the Hrker diagram has the same pattern of Mg-Ca and Mg-Na as several other volcanoes. In conclusion, the hydrostratigraphy in the southern part of the volcano consists of aquiclude and aquifer, while in the southeast there are aquitards of volcanic sandstone and tuff. |
