Abstract:
The detection of seawater intrusion using the electrical resistivity method of dipoledipole
configuration has been in vertigated. The research was conducted in Tanjung
Kapal Village, Rupat District, Bengkalis Regency, Riau Province. Data were collected
using a resistivitimeter, Dipole-Dipole configuration. The data obtained are current
data (I) and potential difference (V). Data processing is carried out using the Res2dinv
software, the result of which is a 2D subsurface resistivity image. The rock resistivity
values on track I (distance ± 1.5km from the beach) ranged from 3.30 m – 1330 m, on
track II (distance ± 700 m from the beach) ranged from 1.07 m – 2595 m. The results
on track 1 show that there is a little intrusion by seawater. The results on track 2 show
that there is a fairly extensive seawater intrusion and affects groundwater as a source
of clean water for the community. This can be seen after testing water samples to the
ESDM Laboratory. For pH (8.22 in line1) and (7.5 in track 2), Temperature (29.0 in
track 1) (26.0 in track 2) oC, Conductivity (2.88 in track 1) (9 ,7 in lane 2) Mhos/cm,
TDS (2168 in lane 1) (2248 in lane 2) Mg/L, TSS (4690 in lane 1) (4284 in lane 2)
Mg/L, salinity (0.14 in lane 2) lane 1) (0.54 on track 2) %, turbidity (195 on track 1)
(204 on track 2) NTU, Color (556.7 on track 1) (268.2 on track 2)
