Identifikasi Potensi Likuifaksi di Kecamatan Sungai Limau Kabupaten Padang Pariaman dengan Metode Geolistrik 2D Tahanan Jenis
DOI:
https://doi.org/10.25077/jfu.9.4.443-449.2020Abstract
Telah dilakukan penelitian untuk mengetahui potensi likuifaksi di Kecamatan Sungai Limau, Kabupaten Padang Pariaman, Sumatera Barat. Data yang digunakan yaitu data sekunder dari Loka Riset Sumber Daya dan Kerentanan Pesisir (LRSDKP) Kota Padang pada tahun 2019. Penelitian ini menggunakan metode geolistrik tahanan jenis 2D konfigurasi Wenner. Pengambilan data dilakukan pada dua lintasan sejajar pantai (L1&L3) dan satu lintasan tegak lurus (L2) pantai dengan panjang lintasan masing-masing 540 m, jumlah titik sounding 54 dan jarak elektroda 10 m. Pengolahan data dilakukan menggunakan software AGI EarthImager 2D. Hasil penelitian menunjukkan lapisan bawah permukaan terdiri dari endapan aluvial berupa pasir dan kerikil yang jenuh air, kedalaman muka air tanah cukup dangkal sekitar 1 – 18 m sehingga berpotensi terjadi likuifaksi. Daerah penelitian juga telah mengalami intrusi air laut sampai sejauh 350 m dari pantai. Intrusi air laut ini membuat sedimen penyusun wilayah semakin jenuh air sehingga potensi likuifaksi lebih tinggi. L1 (lebih dekat ke pantai) memiliki potensi likuifaksi yang relatif tinggi dibandingkan dengan L3 karena kedalaman muka air tanahnya lebih dangkal dan intrusi air laut lebih luas.
Â
Research to determine liquefaction potential in Sungai Limau Region, Padang Pariaman Regency, West Sumatra, had been conducted. The data used are resistivity data surveyed by the Research Institute for Coastal Resources and Vulnerability (RICRV) of Padang in 2019. This study applied the Wenner 2D configuration of the resistivity geoelectric method. Data collection was carried out on two main lines, parallel to the coastline (L1 & L3) and one perpendicular to the coastline (L2) with 540 m length, 54 sounding points, and 10 m electrode distance. Data processing was performed using AGI EarthImager 2D software. The results show that the subsurface layer consists of alluvial deposits in water-saturated sand and gravel. The groundwater level's depth is relatively shallow, around 1 - 18 m indicating a liquefaction potential. The study area also undergoes seawater intrusion up to 350 m from the coastline. Seawater intrusion triggers the existence of water-saturated sediment resulting in enhanced liquefaction potential. L1 (near the coast) showed a relatively higher liquefaction potential than line L3 because of its shallow groundwater-surface, triggering the more expansive seawater intrusion.
References
Hardy, T., Nurdiyanto, B., Ngadmanto, D., dan Susilanto, P., Karakteristik Lapisan Tanah Berpotensi Likuifaksi Berdasarkan Resistivitas Batuan di Daerah Cilacap, Jurnal Meteorologi dan Geofisika, 16, 47-56 (2015).
Muntohar, A.S., Studi Parametrik Potensi Likuifaksi dan Penurunan Permukaan Tanah Berdasarkan Uji Sondir, (Proceedings 16th Annual Scientific Meeting, Jakarta, 2012), hal.139-144.
Pryambodo, D.G. dan Sudirman, N., Identifikasi Likuifaksi di Kawasan Pesisir Kota Padang Dengan Metode Geolistrik 2D, Jurnal Segara, 15, 159-168 (2019).
Pujiastuti, D., Indrawati, Edwiza, D., dan Mustafa, B., Penentuan Bidang Gelincir Daerah Rawan Gerakan Tanah dengan Metode Tahanan Jenis (Studi Kasus Dua Titik Pengamatan di Kampus Unand Limau Manis Padang), (Prosiding Seminar Nasional Fisika Universitas Andalas (SNFUA), 2009), hal.42-45.
Sassa, S. dan Takagawa, T., Liquefied Gravity Flow-Induced Tsunami: First Evidence and Comparison from the 2018 Indonesia Sulawesi Earthquake and Tsunami Disasters, Landslide, 16, 195-200 (2019).
Setyonegoro, W., Gempabumi Padang 30 September 2009 dan Potensi Tsunaminya, Buletin Meterorologi Klimatologi dan Geofisika, 7, 163-171 (2013).
Soebowo, E., Sarah, D., Kumoro, Y. dan Satriyo, N.A., Identifikasi Zona Penurunan Tanha Akibat Likuifaksi di Daerah Serangan-Tanjunggenda, Bali Selatan, (Prosiding Pemaparan Hasil Penelitian Puslit Geoteknologi-LIPI, Bandung, 2011), hal.193-198.
Solihuddin, T., Karakteristik Pantai dan Proses Abrasi di Pesisir Padang Pariaman, Sumatra Barat, Majalah Ilmiah Globe 13, 112-120 (2011).
Tohari, A., Syahbana, A.J., Satrio, N.A. dan Soebowo, E., Karakteristik Likuifaksi Tanah Pasiran di Kota Padang Berdasarkan Metode Microtremor, (Prosiding Pemaparan Hasil Penelitian Puslit Geoteknik-LIPI, Bandung, 2013), hal.95-105.
Warman, H. dan Jumas, D.Y., Kajian Potensi Likuifaksi Pasca Gempa Dalam Rangka Mitigasi Bencana di Padang, Jurnal Rekayasa Sipil, 9, (2013).
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2020 Jurnal Fisika Unand
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Please find the rights and licenses in JFU (Jurnal Fisika Unand).
1. License
The non-commercial use of the article will be governed by the Creative Commons Attribution license as currently displayed on Creative Commons Attribution-NonCommercial 4.0 International License.
2. Authors Warranties
The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).
3. User Rights
JFU's spirit is to disseminate articles published are as free as possible. Under the Creative Commons license, JFU permits users to copy, distribute, display, and perform the work for non-commercial purposes only. Users will also need to attribute authors and JFU on distributing works in the journal.
4. Rights of Authors
Authors retain the following rights:
- Copyright, and other proprietary rights relating to the article, such as patent rights,
- The right to use the substance of the article in future own works, including lectures and books,
- The right to reproduce the article for own purposes, provided the copies are not offered for sale,
- The right to self-archive the article.
5. Co-Authorship
If the article was jointly prepared by other authors, the signatory of this form warrants that he/she has been authorized by all co-authors to sign this agreement on their behalf, and agrees to inform his/her co-authors of the terms of this agreement.
6. Termination
This agreement can be terminated by the author or JFU upon two months notice where the other party has materially breached this agreement and failed to remedy such breach within a month of being given the terminating partys notice requesting such breach to be remedied. No breach or violation of this agreement will cause this agreement or any license granted in it to terminate automatically or affect the definition of JFU.
7. Royalties
This agreement entitles the author to no royalties or other fees. To such extent as legally permissible, the author waives his or her right to collect royalties relative to the article in respect of any use of the article by JFU or its sublicensee.
8. Miscellaneous
JFU will publish the article (or have it published) in the journal if the articles editorial process is successfully completed and JFU or its sublicensee has become obligated to have the article published. JFU may conform the article to a style of punctuation, spelling, capitalization, referencing and usage that it deems appropriate. The author acknowledges that the article may be published so that it will be publicly accessible and such access will be free of charge for the readers.
