#TITLE_ALTERNATIVE#

• Main Author: PATUT TRI PRATOMO - NIM: 22014318, ARY
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25838
• Institution: Institut Teknologi Bandung

<p align="justify">Karstification study based on karst spring hydrochemical data of Watuputih Area, Rembang Regency, Central Java purposed to characterize the hydrogeology of Watuputih Karst. This research was using remote sensing and hydrological method, specifically hydrochemical analysis. <br /> <br /> <br /> <br /> Based on regional stratigraphy, research area has Tawun Formation (Tmtl), Ngrayong Formation (Tmns), Bulu Formation (Tmbl), Wonocolo Formation (Tmws), Ledok Formation (Tmll), Paciran Formation (Tppl), and Lasem Andesite (Qvs). Geological structure in this area showed mainly NW – SE and N – S trending. It closely related to fold, fault, and joint structure which lie in the research area. <br /> <br /> <br /> <br /> Hydrogeological system of research area controlled by lineament pattern, trending NW – SE and W – E. There are two types of karst springs, first type is conducted by joints which called confined spring, beside that is lithological contrast which named dammed spring. Karst spring hydrochemical characters in Watuputih have temperatures reaching from 25,8 to 28,6&#61616;C (hypothermal), water hardness about 249,2 – 499,9 mg/l (hard to very hard), DHL 420 – 1056 &#61549;S/Sm (fresh groundwater), TDS 280 – 704 mg/l, and pH 6,92 – 7,76. CO2 partial pressure valued 0,42 – 5,67% and all springs have saturated condition with CaCO3 (SI Calcite > 0). Hydrochemical facies of springs (Ca-HCO3, Ca-Mg-HCO3, Ca-HCO3-Cl, Ca-Mg-HCO3-Cl) were showing the water flew through limestone and dolomite limestone. <br /> <br /> <br /> <br /> This research area laterally has three zones which are A Zone in the north map, B Zone in the south map, and C Zone in the east map. Vertically, this area separated into three zones that are dry zone, transition zone, and continuous zone. Dry zone elevated at 290 – 360 masl and characterized by open system with rapid precipitation, drip water, and CO2 degassing. This spring debit is temporal, which value about 0,5 – 19, l/s. Transition zone lies below dry zone, elevated at 160 – 290 masl, characterized by closed system with drip water, rapid precipitation, and CO2 degassing. This type of spring is permanent, and the debit flow 0,5 – 94,6 l/s. Continuous zone elevated below 160 masl, and the debit flow 165 – 1564 l/s. This zone has closed flow system and characterized by drip water flow. <p align="justify"> <br />