Identifikasi Potensi Akuifer Air Tanah dengan Metode Resistivitas di Kab. Kotawaringin Barat, Kalimantan Tengah : Studi Kasus PLTG/MG Kumai

Rafiandi, Rizki (2020) Identifikasi Potensi Akuifer Air Tanah dengan Metode Resistivitas di Kab. Kotawaringin Barat, Kalimantan Tengah : Studi Kasus PLTG/MG Kumai. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Daerah penelitian merupakan salah satu proyek pembangunan PLTG/MG milik PT.PLN, dibutuhkan survei pendahuluan sebelum pembangunan pembangkit salah satunya yaitu survei metode Resistivitas dan uji kualitas air tanah. Metode resistivitas pada penelitian ini berguna untuk menentukan kedalaman yang berpotensi sebagai akuifer serta persebaran air tanahnya. Pada penelitian ini air tanah berguna sebagai cooling system radiator pembangkit listrik serta kebutuhan operasional pembangkit. Pada penelitian ini metode resistivitas yang digunakan yaitu resistivitas 1D dengan konfigurasi schlumberger, resistivitas 2D dengan konfigurasi wenner, dan Pemodelan 3D. Hasil pengolahan data dan interpretasi menunjukan bahwa jenis akuifer daerah penelitian merupakan akuifer tertekan dengan adanya lapisan impermeable (lempung). Titik 1 pada 42 m – 60 m dengan nilai resistivitas 1 - 6 ohm.m, Titik 2 pada 34.9 m - 60 m diduga dengan resistivitas 1 - 6 ohm.m. Titik 3 pada 42 m – 60 m dengan resistivitas 1 - 6 ohm.m. Titik 4 34.9 m - 58.3 m diduga adalah akuifer air tanah dengan resistivitas 1 - 6 ohm.m. Titik 5 pada 29.9 m - 57.9 m diduga dengan resistivitas 1 - 10 ohm.m. Distribusi persebaran akuifer terlihat pada cross section pemodelan 3D dari data 1D menunjukkan ketebalan lapisan akuifer yaitu 8 m hingga 28 m dibawah lapisan impermeable (lempung) dengan memiliki volume akuifer berkisar 980.962,5148 meter kubik. BH 1 memiliki memiliki TDS 22780 mg/L , serta kandungan sulfat sebesar sebesar 3983 mg/l termasuk ke tipe semen Portland 5. Pada air bor BH 4 memiliki TDS 21700 mg/L, Sulfat sebesar 3637 mg/l termasuk ke tipe semen Portland 5 dan Air Sumur daerah setempat pada kedalaman 45 meter memiliki TDS 61 mg/L, kadar klorida (Cl) hasil uji laboratorium menunjukan hasil 23 mg/l, kualitas air sumur setempat menjadi acuan serta memenuhi standar dalam water treatment plant pembangkit. ================================================================================== The research area is one of the PLTG / MG development projects owned by PT. PLN, requiring a preliminary survey before the construction of the plant, one of which is the resistivity method survey and groundwater quality testing. The resistivity method in this study is useful for determining the depth of potential aquifers as well as the distribution of groundwater. In this study, groundwater is useful as a cooling system for power plant radiators and generating operational needs. In this study, the resistivity method used is 1D resistivity with Schlumberger configuration, 2D resistivity with Wenner configuration, and 3D Modeling. The results of data processing and interpretation show that the type of aquifer in the study area is a distressed aquifer in the presence of an impermeable layer (clay). Point 1 at 42 m - 60 m with resistivity value of 1-6 ohm.m, Point 2 at 34.9 m - 60 m is expected with a resistivity of 1-6 ohm.m. Point 3 at 42 m - 60 m with resistivity 1-6 ohm.m. Point 4 34.9 m - 58.3 m is thought to be a groundwater aquifer with a resistivity of 1-6 ohm.m. Point 5 at 29.9 m - 57.9 m is estimated with a resistivity of 1-10 ohms. The distribution of aquifer distribution seen in the cross-section of 3D modeling from 1D data shows the thickness of the aquifer layer which is 8 m to 28 m below the impermeable layer (clay) with aquifer volume ranging from 980,962.5148 cubic meters. BH 1 has TDS 22780 mg / L, and sulfate content of 3983 mg / l, including Portland type cement 5. In drill water BH 4 has TDS 21700 mg / L, Sulfate at 3637 mg / l including Portland 5 type cement and local area well water at a depth of 45 meters has a TDS of 61 mg / L, chloride (Cl) laboratory test results show the results of 23 mg / l, local well water quality is a reference and meets the standards in the plant's water treatment plant.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Air Tanah, Resistivitas, schlumberger, wenner, Groundwater, Resistivity
Subjects: G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs
Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport.
Divisions: Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User: Rizki Rafiandi
Date Deposited: 13 Aug 2020 03:45
Last Modified: 14 Aug 2020 01:00
URI: http://repository.its.ac.id/id/eprint/77848

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