Warta Geologi, Vol. 46, No. 3, December 2020, pp. 199–203
Identification of unconfined aquifer using 3D resistivity
analysis at Simpang 5 area, Semarang, Central Java, Indonesia
Supriyadi1,*, Fianti1, Dwi Rizki R1,
Agus Setyawan2, Ronaldo Talapessy3
1 Physics Department, Universitas Negeri
Semarang, Indonesia
2 Physics Department, Diponegoro University,
Indonesia
3 Graduate School Of Science and Technology,
Kumamoto University, Kumamoto, Japan
* Corresponding author email address:
supriyadi@mail.unnes.ac.id
Abstract:
Water is a unique property of the Earth and very important to every living
organism. The existence of groundwater is only 0.61% of the total water on
earth (oceans, rivers, lakes, polar ice, rain). The purpose of this research is
to determine the location and depth of the aquifer by using 2D and 3D modeling.
The method of research is resistivity method using Schlumberger configuration,
where data is collected according to the survey design with coordinate ranging
from X:436100, Y:9226880 to X:436680, Y:9227640, and covered by 7 lines. The
modeling results indicate that the present groundwater aquifer potential has
low resistivity distribution in this area. The spreading of unconfined aquifer
is estimated on the north side to the east of Simpang 5 area. This can be seen
from syncing the data of line one to six. But the data on line seven is of
different patterns with other lines. The existence of groundwater basin is not
easily identified on this line. This may be due to the location of Line Seven
being located in the area of Ciputra Mall, Horison Hotel and Tlogorejo Hospital
with higher consumption of water, thus the decrease in groundwater condition.
This may cause conditions such as land subsidence. The results of
interpretation based on the modeling show the possibility of an unconfined
aquifer with groundwater level at 10-15 m depth with varied end of border
groundwater depth.
Keywords:
Alluvium, geoelectric, groundwater, unconfined aquifer, Simpang 5, Semarang
DOI :
https://doi.org/10.7186/wg463202005
ISSN
0126–5539; e-ISSN 2682-7549
