Open AccessHydrochemistry temporal variation of Anjani Underground River, Jonggrangan Karst, Java Island, Indonesia
Author(s) -
A. D. Pratama,
Tjahyo Nugroho Adji,
Dicky Satria Dwiputra
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/451/1/012059
Subject(s) - groundwater recharge , dry season , karst , hydrology (agriculture) , aquifer , calcite , wet season , precipitation , groundwater , dilution , dissolution , environmental science , geology , mineralogy , chemistry , geography , paleontology , physics , geotechnical engineering , cartography , meteorology , thermodynamics
Anjani underground river was one of the biggest water resource in Jonggrangan Karst. The objective of this research was to describe hydrochemical temporal variation which was expected to assist in defining the aquifer conditions that recharge Anjani underground river in more detail. Sampling was carried out for one year covering dry and wet seasons, as well as the flood events. The hydrochemical analysis was conducted based on dissolved major ion concentration and physicochemical properties. In addition, SIcalcite and log PCO 2 were calculated to understand the temporal variation of aggressiveness on calcite mineral. The results showed that all water samples performed HCO 3 -Ca type. The chemical constituent in water varied temporally which showed high during dry season and decreased during wet season. The high chemical constituent during dry season was caused by the domination of slow-flow (diffuse) so the water had a longer residence time in aquifer, allowing water-rock interaction to be more intensive. Meanwhile, the low dissolved constituent during wet season was caused by input from quick-flow that changed water-rock interaction into dilution by precipitation process. Generally, all water samples was saturated with respect to calcite, except during flood events. One of the factors that affected this condition was CO 2 supply from the allogenic river that allowed the dissolution process to be more intensive.