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Groundwater Genesis Determination Using Stable Isotope Data and Hydrochemistry in the Bali Cultural Center and Surroundings a) Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University Abstract The Bali Cultural Center, located in Klungkung Regency, Bali Province, is currently being developed to support the increase in tourism and as an effort to preserve Balinese culture. The Bali Cultural Center spans 334.62 hectares and will feature facilities designed to showcase Balinese diverse cultural heritage. In order to meet the water needs in this area, the Tukad Unda Reservoir is being constructed, which is also projected to meet the water needs in the Klungkung and Karangasem Regencies. The approach in this study involves integrating hydrochemical analysis and stable isotope data 18O and 2H, which are tested using the cavity ringdown spectrometer method to understand the hydrogeological system linkage in the geological complex of the Bali Cultural Center and its surroundings. A total of 24 hydrochemical test samples and 16 stable isotope test samples were collected spatially from various water sources, including rainwater, springs, shallow groundwater, and deep groundwater, from different rock formations. The results of this study indicate the origins of the groundwater in the Bali Cultural Center and its surroundings, as well as the characteristics of the aquifers that make it up. This information is important in order to protect the sustainability of the recharge areas, so as to achieve sustainable use of groundwater. The hilly region north of the Bali Cultural Center is considered a recharge zone for springs and deep groundwater. Furthermore, shallow groundwater is replenished by recharge areas at lower elevations and continues to be affected by surface water conditions. Keywords: Bali Cultural Center, Stable Isotopes, Hydrochemistry, Recharge Area Topic: Interdisciplinary Earth Science and Technology |
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