RAYHAN, GHAZA LAZARUZ (2021) IDENTIFIKASI ZONA AKUIFER AIR PAYAU MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KECAMATAN SAMBUNGMACAN, KABUPATEN SRAGEN, JAWA TENGAH. Other thesis, Universitas Pembangunan Nasional "Veteran" Yogyakarta.
Full text not available from this repository.Abstract
INTISARI
IDENTIFIKASI ZONA AKUIFER AIR PAYAU
MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI
SCHLUMBERGER DI KECAMATAN SAMBUNGMACAN,
KABUPATEN SRAGEN, JAWA TENGAH
Oleh :
Ghaza Lazaruz Rayhan
115.160.036
Penggunaan air minum rumah tangga di Sragen mengalami peningkatan dari tahun
ke tahun. Di Sragen, air tanah merupakan salah satu sumber air bersih yang banyak
digunakan, karena mudah diperoleh dan relatif murah eksplorasi dan eksploitasinya.
Sayangnya beberapa akuifer, terutama akuifer yang dalam terdapat air payau sehingga tidak
layak dijadikan sebagai sumber air bersih tanpa pengolahan terlebih dahulu. Pertimbangan
pemilihan lokasi penelitian adalah adanya keunikan di daerah penelitian yang jauh dari laut
namun ditemukan adanya akuifer air payau. Sedangkan alasan pemilihan metode karena
akuifer air payau dapat dengan mudah diidentifikasi oleh parameter geolistrik, yaitu nilai
resistivitas. Perbedaan nilai resistivitas antara akuifer air payau yang lebih rendah daripada
nilai resistivias batuan di sekitarnya membuat metode geolistrik cocok digunakan untuk
mencari letak akuifer air payau di daerah penelitian.
Penelitian bertujuan untuk mengetahui daerah-daerah yang terdapat akuifer air
payau di Kecamatan Sambungmacan, Kabupaten Sragen, Jawa Tengah. Akuisisi dilakukan
menggunakan metode geolistrik konfigurasi schlumberger dengan 20 titik pengukuran
dengan bentangan sepanjang 600 meter. Pengolahan berupa curve matching dilakukan
untuk mendapat nilai resistivitas yang sesungguhnya pada tiap lapisannya. Curve matching
dilakukan menggunakan software IP2WIN kemudian dilakukan korelasi antar titiknya
menggunakan software Strater. Selain itu juga dilakukan pengolahan 3D menggunakan
software Rockworks.
Hasil pengolahan data menunjukkan bahwa persebaran air payau di daerah penelitian
berada di bagian timur lokasi penelitian (titik 18, 10, 8, 12, 13, 14, dan 19) dan di bagian
tengah lokasi penelitian (titik 11, 1, 3, 2, dan 4). Akuifer air payau ini terdapat di lapisan
batupasir. Rentang nilai resistivitas air payau daerah penelitian adalah sebesar 2,91 – 4,64
Ωm. Akuifer air payau di daerah penelitian berada di kedalaman sekitar 53 – 66 meter di
bawah permukaan tanah dan ketebalan sekitar 9 – 14 meter. Keberadaan air payau ini
diduga berasal dari air masa lampau (connate water). Daerah penelitian pada masa lampau
berupa lautan yang kemudian mengalami pengangkatan. Dasar air laut yang tidak rata (ada
tinggian dan rendahan) menyebabkan air laut terjebak dan terakumulasi di daerah rendahan.
Hal ini yang membentuk spot-spot akuifer air payau pada daerah penelitian
Kata Kunci : Air payau, Geolistrik, Schlumberger, Sambungmacan
ABSTRACT
IDENTIFICATION OF BRACKISH WATER AQUIFER ZONE
USING GEOELECTRICAL METHOD, CONFIGURATION OF
SCHLUMBERGER AT SAMBUNGMACAN DISTRICT OF
SRAGEN, CENTRAL JAVA
By :
Ghaza Lazaruz Rayhan
115.160.036
The use of household drinking water in Sragen has increased from year to year. In
Sragen, groundwater is one of the most widely used sources of clean water, because it is
easy to obtain and relatively cheap to explore and exploit. Unfortunately, some aquifers,
especially aquifers that contain brackish water, are not suitable as a source of clean water
without prior treatment. The consideration in selecting the research location is the
uniqueness of the research area which is far from the sea but brackish aquifers are found.
Meanwhile, the reason for choosing the method is because the brackish water aquifer can
be easily identified by the geoelectric parameter, namely the resistivity value. The
difference in the resistivity value between the brackish water aquifer which is lower than
the resistivity value of the surrounding rocks makes the geoelectric method suitable to be
used to locate brackish water aquifers in the study area.
This study aims to determine the areas where brackish water aquifers are located in
Sambungmacan District, Sragen Regency, Central Java. The acquisition was carried out
using the Schlumberger configuration geoelectric method with 20 measuring points with a
stretch of 600 meters. Processing in the form of curve matching is done to get the real
resistivity value for each layer. Curve matching was performed using IP2WIN software and
then correlated between points using Strater software. In addition, 3D processing is also
carried out using Rockworks software.
The results of data processing show that the distribution of brackish water in the
study area is in the eastern part of the research location (points 18, 10, 8, 12, 13, 14, and
19) and in the middle of the research location (points 11, 1, 3, 2, and 4). This brackish
water aquifer is found in sandstone layers. The range of resistivity values for brackish
water in the study area is 2.91 - 4.64 Ωm. The brackish water aquifer in the study area is
at a depth of about 53 - 66 meters below ground level and a thickness of about 9 - 14
meters. The presence of brackish water is thought to have originated from connate water.
The research area in the past was in the form of an ocean which then underwent a lift.
Uneven seabed (there are high and low) causes sea water to be trapped and accumulate in
low-lying areas. This is what forms brackish water aquifer spots in the study area.
Keywords: Brackish Water, Geoelectric Method, Schlumberger, Sambungmacan
| Item Type: | Thesis (Other) |
|---|---|
| Subjek: | Q Science > Q Science (General) |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment |
| Depositing User: | Muji Isambina |
| Date Deposited: | 08 Feb 2021 02:52 |
| Last Modified: | 08 Feb 2021 02:52 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/24568 |
Actions (login required)
 |
View Item |