Aquifer characteristic and groundwater hydrochemistry around South Cipete, DKI Jakarta Province
Suherman Dwi Nuryana (a*), Dwi Wisnu Andika N (a), Arini Dian (a), Anto Kadyanto (b)
a) Department of Geological Engineering, Faculty of Earth Technology and Energy, Universitas Trisakti.
Jl. Kyai Tapa No. 1, Jakarta 11440, Indonesia
* suhermandwi[at]trisakti.ac.id
b) Department of Geological Science, Faculty of Geological Engineering, Universitas Padjadjaran
Abstract
South Cipete area is a highly populated area, where the extraction of groundwater is very intensive, so that the allocation of groundwater has decreased in term of quality and quantity. The purpose of this study is to determine the type of aquifer and groundwater hydrochemistry. Research methods are include field observations, groundwater sampling, physical properties measurement and chemical analysis of the main ions as well as description and correlation of drill log data. Based on the northwest-southeast cross section of lithology log, the aquifer types are: stressed aquifers composed of sandstones and silt; semi-stressed aquifers composed of clays and conglomerates at depths of 10 m to -15 m. From the southwest-northeastern cross section, the type of aquifer are: stressed aquifer composed of sandstones with clay; free aquifer buried by backfill materials and silt.soils; and semi-stressed aquifers, surrounded by silt and clay sandstones, at the depths of ± 23 m to ± 3 m. Groundwater hydrochemistry in the sample SG/02, SG/04, SG/08 the dominant cations and anions are Na+ + K+ with a value of 56.56%; 57.13%; 25.03% and HCO3- at 26.91%. While in sample SG/06, SG/07 the dominant cations and anions are Mg2+ at 25.81%; 24,52% and anions SO42- at 32.70%; 30.96%.
Keywords: Hydrochemistry, Aquifer, Cipete, Cation, Anion
Topic: Environmental Engineering