Utami, Amanda Rizky (2019) Aplikasi Metode Geolistrik Tahanan Jenis Konfigurasi Dipole-Dipole untuk Identifikasi Intrusi Air Laut di Kota Semarang. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kawasan pesisir utara Kota Semarang mengalami berbagai permasalahan lingkungan seperti penurunan muka tanah, banjir rob, peningkatan kandungan chlorida pada beberapa sumur pantau, dan sumur gali penduduk yang terasa asin. Permasalahan tersebuat mengindikasikan terjadinya penurunan kualitas air tanah akibat intrusi air laut. Intrusi air laut merupakan permasalahan lingkungan yang berdampak pada banyak aspek kehidupan seperti gangguan kesehatan, penurunan kesuburan tanah, dan kerusakan bangunan. Masalah dugaan intrusi air laut ini dapat diidentifikasi dengan metode geolistrik tahanan jenis dengan konfigurasi dipole-dipole multielectrode. Penelitaian bertujuan untuk mengidentifikasi adanya zona intrusi air laut pada air tanah dan memperkirakan jauhnya sebaran intrusi air laut ke daratan. Pengambilan data dilakukan di sepanjang banjir kanal barat. Data yang didapatkan berupa sebaran nilai resisitivitas semu bawah permukaan lintasan pengukuran. Pengolahan data dilakukan dengan software EarthImager 2D. Berdasarkan hasil interpretasi model penampang 2D, zona yang teridentifikasi sebagai zona intrusi air laut diduga mempunyai harga resistivitas rendah, kurang dari 3 Ohm.m (ρ < 3Ohm.m) berada pada bentangan 0-2600 meter. Intrusi air laut tebal dibagian utara pada kedalaman 70 meter menipis dibagian selatan pada meter ke 2600. Pada bentangan 2600-7000 meter masih dijumpai tahanan jenis rendah dalam bentuk stempat-setempat tidak menerus. Perkiraan jauhnya sebaran intrusi air laut lebih detail ke daratan perlu diteliti lebih lanjut dengan menggunakan metode geofisika lainnya dan pengujian pada sumur pantau atau sumur penduduk disekitar lokasi penelitian untuk hasil yang lebih akurat.
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The northern coastal area of Semarang City has various environmental problems such as land subsidence, tidal floods, increased chloride content in several monitoring wells, and population’s dug wells that felt breckish to salty. These problems indicate a decrease in the quality of ground water due to seawater intrusion. Seawater intrusion is an environmental problem that affects many aspects of life such as health problems, decreased soil fertility, and damage to buildings. Seawater intrusion can be identified by geoelectric resistivity method with dipole-dipole multielectrode configuration. The research aims to identify the presence of seawater intrusion zones in groundwater and estimate the spread of seawater intrusion to the land. Data collection was carried out along the western canal flood. The data obtained is in the form of the distribution of the apparent pseudo-resistivity value of the measurement path. Data is processed using EarthImager 2D software. Based on the results of the 2D cross section model, the zone identified as a seawater intrusion’s zone is thought to have a low resisitivity price, less than 3 Ohm.m (ρ < 3 Ohm.m) in a range of 0-2600 meters. Seawater intrusion has 70 meters depth and thinning at the south at 2600 meters. From range 2600-7000 meters, there is still low resisitivity in the form of a uncontinuous local-quarters. Estimates of the distribution of more detalied seawater intrusion into the land need to be examined in more detail by using various geophysical methods and monitoring wells of residents.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSFi 550 Uta a-1 2019 |
| Uncontrolled Keywords: | EarthImager 2D, Geolistrik Dipole-Dipole, Intrusi Air Laut, Semarang, Tahanan Jenis, Geoelectric Dipole-Dipole, Resistivity, Seawater Intrusion, Semarang. |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QE Geology > QE601 Geology, Structural T Technology > T Technology (General) > T57.5 Data Processing |
| Divisions: | Faculty of Natural Science > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Amanda Rizky Utami |
| Date Deposited: | 31 May 2024 02:05 |
| Last Modified: | 31 May 2024 02:05 |
| URI: | http://repository.its.ac.id/id/eprint/64746 |
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