Identifikasi Hidrostratigrafi Pada Akuifer Tertekan di Kecamatan Winongan, Kabupaten Pasuruan

Abdullah, Fikri (2022) Identifikasi Hidrostratigrafi Pada Akuifer Tertekan di Kecamatan Winongan, Kabupaten Pasuruan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kondisi airtanah di Kecamatan Winongan, Kabupaten Pasuruan, yang beberapa waktu terakhir mengalami penurunan debit mataair, menjadikan kondisi hidrogeologi di lokasi tersebut perlu ditinjau lebih lanjut. Penelitian ini bertujuan untuk mengetahui hidrostratigrafi akuifer tertekan di Kecamatan Winongan berdasarkan pengolahan data log, data Vertical Electrical Sounding (VES), nilai koefisien permeabilitas, dan pengamatan petrografi. Penyusunan stratigrafi didasarkan pada data log, dan interpretasi data VES. Klasifikasi satuan hidrostratigrafi disusun berdasarkan stratigrafi, nilai koefisien permeabilitas setiap litologi, dan pengamatan petrografi. Dari penelitian ini diketahui bahwa kondisi hidrogeologi Kecamatan Winongan tersusun atas empat satuan hidrostratigrafi. Satuan hidrostratigrafi (SH) I tersusun atas lava andesit, lapukan lava, dan breksi autoklastik dengan rentang konduktivitas hidrolik (Kf) 1×10-12–1×10-4 m/s. Satuan hidrostratigrafi II tersusun atas tuf dengan nilai Kf 2,78×10-4 m/s, dan memicu penurunan resistivitas dari litologi lava. Satuan hidrostratigrafi III tersusun atas ignimbrit-skoria dan pasir tufan dengan nilai Kf 8,6×10-8–1×10-4 m/s, dideteksi dari kenaikan nilai resistivitas hingga >40 Ohm.m dari litologi tuf. Satuan hidrostratigrafi IV tersusun atas breksi polimik dan pasir tufan dengan nilai Kf 1,75×10-8–1×10-4 m/s, dideteksi dari perubahan nilai resistivitas pada kedalaman paling dangkal 45 meter. Satuan hidrostratigrafi I tersebar di sisi selatan seluas 35,21% dari area penelitian dengan kedalaman 0–40 meter, sedangkan SH II, SH III, dan SH IV sejak tidak tertutup lava berturut-turut berada di kedalaman rata-rata 0–15 meter, 15–70 meter, dan mulai dari 70 meter dari permukaan.
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Groundwater condition in Winongan District, Pasuruan Regency, recently experienced reduced spring discharge. Those case require study about hydrogeology furthermore. This research aims to cognize confined aquifer hydrostratigraphy in Winongan District, Pasuruan Regency based on borehole logs, Vertical Electrical Sounding data processing, hydraulic conductivity testing, and petrographic observation. Stratigraphy framework in research area constructed based on borehole lithology and VES data interpretation. Hydrostratigraphy unit classification constructed based on stratigraphy, permeability coefficient value each lithology, and petrography observation. This research propose hydrogeoloy framework in Winongan District area composed by four hydrostratigraphy units. The first hydrostratigraphy unit (HU) constisted of andesitic lava, weathered lava, and autoclastic breccia with their hydraulic conductivity value (Kf) 1×10-12–1×10-4 m/s. The second hydrostratigraphy unit consisted of tuff with its Kf value 2,78×10-4 m/s, identified by decrease of resistivity value from lava layer. The third hydrostratigraphy unit constisted of scoriaceous ignimbrite and tuffaceous sandstones which its Kf value 8,6× 10-8–1×10-4 m/s, identified by increase of resistivity value up to >40 Ohm.m from tuff layer. The fourth hydrostratigraphy unit consisted of polygenic breccia and tuffaceous sandstone which its Kf value 1,75×10-8–1×10-4 m/s, identified by change in resistivity value in at the shallowest depth 45 meter below the surface. The first hydrostratigraphy unit spreads 35,21% on the south side with 0–40 meters depth, whereas HU II, HU III, dan HU IV since detached from lava have depth of 0–15 meters, 15–70 meters, and begin at 70 meters beneath the surface.

Item Type:	Thesis (Other)
Additional Information:	RSGf 553.79 Abd i-1 2022
Uncontrolled Keywords:	Confined Aquifer, Hydraulic Conductivity, Hydrostratigraphy, Resistivity, Winongan District.
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1003.2 Groundwater.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	- Davi Wah
Date Deposited:	28 Nov 2023 09:02
Last Modified:	28 Nov 2023 09:02
URI:	http://repository.its.ac.id/id/eprint/105226

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