Geochemical Evolution and Groundwater Flow System in Batujajar Groundwater Basin Area, West Java, Indonesia

• DOI: 10.17014/ijog.7.1.87-104
• Publication Date: 2020-04-29T04:00:58Z
• Authors: Rudy Suhendar; M. Sapari Dwi Hadian; Budi Muljana; Taat Setiawan; Hendarmawan Henda...
• Keywords: 2. Zero hunger; 13. Climate action; 0207 environmental engineering; 02 engineering and technology; 15. Life on land; 6. Clean water

DOI:10.17014/ijog.7.1.87-104Batujajar and its surrounding areas, situated in the west of Bandung Basin, are geologically composed various Tertiary rock formations with complex fold fault systems. Springs drilled wells sandstone aquifers, tuffaceous sand, breccias mark development their aquifer This study aimed to determine characteristics hydrogeochemistry by analyzing major ions stable isotopes (18O 2H) thirty-four hydrogeological objects. The groundwater flow pattern this area is controlled northwest-southeast lineament, as indicated emergence springs along transition zone between areas high low lineament density. In order dominance, facies follows:Ca-Mg-HCO3>Ca-HCO3>Ca-Na-Mg-HCO3>Na-Ca-HCO3. Hydrochemical evolutions were detected from change cations Ca2+ Mg2+ then Na+, believed be product cation exchange dissolution silicate minerals. However, toward anion changes not apparent yet, meaning that HCO3- still prevail, or other words system local. Nevertheless, geological hydrogeochemical analyses, relative compositions isotopes, revealed had three systems, namely shallow, intermediate, deep flows; all which segmented subgroundwater basins (Sub-GWB). Aquifer systems shallow intermediate found Sub-GWB-A, Sub-GWB-B, Sub-GWB-C, while ones identified Sub-GWB-B Sub-GWB-C.Fracture has an important role a connector recharge hilly discharge plain areas.