Open AccessHydrogeochemical and groundwater aggressiveness assessment in the epikarst aquifer: a spatial and temporal analysis
Author(s) -
Pipit Wijayanti,
Rita Noviani
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/683/1/012141
Subject(s) - aquifer , groundwater , karst , lithology , geology , spring (device) , hydrology (agriculture) , spatial variability , facies , geochemistry , geomorphology , geotechnical engineering , structural basin , mechanical engineering , paleontology , statistics , mathematics , engineering
The ability of water to dissolve rocks, which is indicated by groundwater aggressiveness, controls the rate and extent of the current karstification process. This study aimed to analyze the hydrogeochemistry and characteristics of groundwater aggressiveness in an epikarst aquifer, both temporally and spatially, using seven (7) major ions, namely Ca2+, HCO3 − , Mg 2+ , K, Na, SO 4− and Cl − as parameters. These ions were then plotted into a Piper diagram to find out the hydrogeochemical facies of the groundwater. Meanwhile, the groundwater aggressiveness was analyzed in PHREEQC software. Nine (9) springs were each sampled one time for the spatial analysis. As for the temporal observation, seven (7) samples were collected from one spring. The results revealed that the hydrogeochemistry of the epikarst aquifer was composed of Ca 2+ HCO 3− groundwater, indicating that the limestone (calcite) dominates the lithology of the aquifer. Moreover, temporal variations were detected in the groundwater aggressiveness levels, namely high in the rainy season, but low in the dry season. Spatially, the aggressiveness of groundwater emerging to the selected springs also varied depending on the development of the underlying karst aquifers.