CHARACTERIZATION OF PHYSICAL PARAMETERS – GROUNDWATER CHEMISTRY AND GROUNDWATER QUALITY ANALYSIS ON THE SOUTH SLOPE OF MOUNT MALABAR, WEST JAVA

• Main Author: Rahmany Binadzier, Fadhlan
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/69836
• Institution: Institut Teknologi Bandung

The need for groundwater in the South Slope of Mount Malabar or the Pangalengan District continues to increase along with the increase in population. The surrounding community tends to use water for their daily needs from springs that have been accommodated in tubs rather than using dug wells. This is due to the poor quality of water obtained from dug wells. Therefore, it is necessary to conduct research on geological, hydrogeological, and groundwater quality conditions in the Pangalengan area. Geographically, the research area is located at UTM zone coordinates 48s 783000 – 791000 mT and 92010000 – 9210000 mU. The methods used in this research are geological preparation based on literature, hydrogeological mapping, clustering with the K – Means algorithm, and analysis of groundwater quality for irrigation purposes and basic drinking water using the Ground Water Quality Index (GWQI) method. The geomorphology of the research area is divided into 4 geomorphological units, namely Pangalengan Pyroclastic Plain Unit, Pyroclastic Hills and Wayang-Windu Lava Unit, the Malabar Lahar Ridge Unit, and Pyroclastic Hills and Malabar Lava Unit. Volcanostratigraphically, the study area contains 17 rock units which are divided into 2 khuluks and 7 gumuks. The geological structures found in the research area are Sheeting Joint, Cileunca 1 Left Normal Fault, Cileunca 2 Left Fault, Panganten Left Fault, Puncakbesar Right Fault, Ranca Right Fault, and Lamajang Right Normal Fault. The aquifers in the study area are unconfined aquifers which are divided into 8 groups, namely the Wayang Pyroclastic Breccia Aquifer, Puncakbesar Breccia Tuff Aquifer, Panganten Andesite Lava Fracture Aquifer, Panganten Breccia Tuff Aquifer, Malabar Tuff Aquifer 1, Malabar Tuff Aquifer 2, Aquifer Malabar Lava Breccia, and Windu Lapili Tuff Aquifer. From the results of the K-means algorithm using parameters of physical properties, groundwater conditions in the study area are divided into 3 classifications consisting of uncontaminated cold springs, contaminated cold springs, and hot springs. The hydrochemical facies analysis of groundwater in the study area uses a Piper Diagram which shows three types of hydrochemical facies, namely type Ca2+/Mg2+ - HCO3 -, type Ca2+ - SO4 2-, and mixed type. Based on GWQI analysis and water for irrigation, obtained 14 cold springs that are good for drinking and 2 cold springs that are very good for irrigation purposes.