Sea Water Intrusion
Monitoring on the Sendangbiru of the Southern Malang Coastal Area based on Geoelectrical
Resistivity Data
Sunaryo
Disaster Advances; Vol. 14(9); 43-48;
doi: https://doi.org/10.25303/149da4348; (2021)
Abstract
The study was conducted with the objective to distinguish the presence of seawater
intrusion layer or salt-water aquifer distribution along the data acquisition line
at the locations. Data acquisition was conducted by using the Wenner-Schumberger
configuration of geoelectrical resistivity. From this research, 4 lines and 4 points
of vertical electrical sounding (VES) data for every line were obtained with the
distance between electrode a as 10m.
Based on the data processing, obtained depth up to 120m with the smallest resistivity
value is 0.02Ωm and the largest is 6764.52Ωm. To make the distribution of resistivity
values along the path line of the study, cross sections were made until a depth
of 120m. Based on the cross-section, the low resistivity value (less than 1.5 Ωm)
that interpreted as a seawater intrusion layer or salt water aquifer distribution
is located at varying depths. There are intrusions for the SB1 cross section, there
is an intrusion at a depth of 6m-7m as far as 10m, at a depth of 6m-8m as far as
10m for the SB2 cross section and at a depth of 22m - 26m as far as 25m for the
SB3 cross section.
