APPLICATION OF GEOELECTRIC METHOD FOR AQUIFER IDENTIFICATION IN THE FOOT OF GAMALAMA VOLCANO ON SMALL VOLCANIC TERNATE ISLAND
A Ternate island is located on the west side of Halmahera island which passed by the zone of cincin api (Ring of Fire) so there is a volcano in it (Gamalama Volcano). The water availability in this island depends on the amount of groundwater recharge obtained through data processing which those d...
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| 主要作者: | |
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| 格式: | Final Project |
| 語言: | Indonesia |
| 在線閱讀: | https://digilib.itb.ac.id/gdl/view/69377 |
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| 機構: | Institut Teknologi Bandung |
| 語言: | Indonesia |
| 總結: | A Ternate island is located on the west side of Halmahera island which passed by
the zone of cincin api (Ring of Fire) so there is a volcano in it (Gamalama Volcano).
The water availability in this island depends on the amount of groundwater
recharge obtained through data processing which those datas is available on
BMKG online site. In order to be able to map the distribution of groundwater in the
aquifer, the 2D geoelectric modelling was carried out using Res2DInv and ResIPy
applications with the validation of interpretation is using DHL and Salinity data
and the geological map and the aquifer system map data. The supporting softwares
used in this research are Surfer, ArcGIS, and Microsoft Excel. The result of
geoelectric data modelling on the Jikomalamo line gives a resistivity values
between 104.5 – 14744 ?m, while modelling on the Takome line gives resistivity
values start from 99.2 – 1019.8 ?m, for the Tabam line geoelectric modelling has
resistivity values ranging from 2.8 – 203.5 ?m, the geoelectric modelling of the
Akehuda line gives resistivity values from 5 – 3382.8 ?m, the modelling on the
PDAM line results resistivity values between 1.5 – 67.3 ?m, the modelling on the
SKEP line shows resistivity values ranging from 58 – 896 ?m, the geoelectric
modelling of the Kayu Merah line is in the range of resistivity values 14.1 – 411.8
?m, the modelling on the Kalumata line gives resistivity values between 1.9 – 35.2
?m, the geoelectric modelling of of the Fitu line shows resistivity values in the
range of 16.2 – 43 ?m, and modelling on the Sasa line gives resistivity values start
from 14.5 – 141.9 ?m. The groundwater resistivity values on all areas where
geoelectric profiling applied are generally below 200 ?m while the seawater
(brackish) resistivity values detected on aquifer occur in the PDAM line and Sasa
line only are between values 0 up to 30 ?m. The average amount of groundwater
recharge in a Ternate island at 2014 – 2021 peiod interval is 12 millions m3, so that
approximately the amount of groundwater which enter and leave the aquifer must
still have a equal volume to that value. |
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