Pemodelan 3D Soil Resistivity Untuk Identifikasi Paleochannel Studi Kasus Desa Terung Wetan, Krian

Azizah, Na'imatul Hadi (2019) Pemodelan 3D Soil Resistivity Untuk Identifikasi Paleochannel Studi Kasus Desa Terung Wetan, Krian. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Di pinggiran kawasan Delta Brantas, yaitu Desa Terung Wetan, Kecamatan Krian, Kabupaten Sidoarjo, Provinsi Jawa Timur sering ditemukan penemuan bersejarah beberapa tahun terakhir. Minimnya informasi yang diperoleh tentang kondisi situs arkeologi terutama kawasan Candi Terung yang diperkirakan merupakan pelabuhan pada masa lampau merupakan suatu hambatan dalam proses pencarian situs arkeologi tersebut. Sehingga perlu dilakukan suatu kajian ilmiah tentang sedimentasi dan pembentukan delta sungai Brantas, Desa Terung Wetan berupa pemetaan mengenai paleochannel atau sungai purba menggunakan metode geofisika resistivitas. Penelitian ini menggunakan data resistivitas hasil pengukuran geolistrik konfigurasi wenner dan uji resistivitas pada sampel tanah yang diambil di 20 titik pengeboran pada lokasi penelitian. Uji resistivitas dilakukan pada sampel tanah menggunakan konfigurasi wenner dengan jarak antar elektrodanya sebesar 1 cm. Data resistivitas diolah untuk didapatkan penampang 2D. Kemudian dilakukan pemodelan 3D menggunakan metode kriging agar didapatkan gambaran yang lebih detail. Tujuan dari penelitian ini adalah mengetahui nilai resistivitas pada lokasi penelitian sehingga dapat diketahui sebaran sungai purba berdasarkan hasil pemodelan 3D nilai resistivitas hasil pengukuran geolistrik dan uji resistivitas sampel tanah. Nilai resistivitas yang diperoleh berdasarkan hasil inversi antara 3 – 60 Ωm, sedangkan nilai resistivitas berdasarkan hasil pengukuran sampel tanah antara 4.12 – 33.39 Ωm. Pola persebaran paleochannel dapat diketahui melalui pemodelan 3D resistivitas hasil inversi. Terdapat pada kedalaman 4.5 – 10 meter dengan besar nilai resistivitas >30 Ωm. Resistivitas hasil pengukuran sampel tanah belum bisa menunjukkan lokasi keberadaan paleochannel dapat karena nilai resistivitas yang didapatkan terlalu rendah dan letak kedalaman yang terlalu dangkal sehingga tidak sesuai dengan lokasi keberadaan paleochannel yang ditunjukkan oleh pemodelan resistivitas hasil inversi.
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In the last couple of years, there has been found many historical items in the riverside of Delta Brantas, Terung Wetan Village, District of Krian, Sidoarjo, East Java. The minimum information about the sites, especially in Candi Terung, which was suspected as a harbor in the early years of the city, causing a barrier during the process of finding this site. So we need to do a scientific study about sedimentation and formation of Delta Brantas riverside, Terung Wetan County, by mapping the areas, or we can say paleochannel, by using resistivitation geophysics methods. This research uses measurement results of resistivity data by wenner’s geoelectric configuration and resistivity test, using ground samples taken from 20 spots in the research area. The resistivity test was carried out on soil samples using a wenner configuration with a distance of 1 cm between electrodes. Resistivity data is processed to obtain 2D cross section. Then, 3D-models are made using the kriging method so that we can get the detail images. The purpose of this research is to find the resistivity value of the destined location, so that the spread of paleochannel that is based on 3D models of resistivity value measure as the result of geoelectric and resistivity test of ground samples can be known. The resistivity values based on the inversion results are between 3-60 Ωm, while the resistivity values based on the ground sample measurement were resulted between 4.12 – 33.39 Ωm. The paleochannel spreadings were known through the inversion results of 3D resisitivity models. It shows in 4.5-10 metres deep with resistivity numbers less than 30 Ωm. Meanwhile, the resistivity numbers of ground test measurement result could not be used as a reference to define the pattern of paleochannel spreadings, since the numbers of resistivity are too low, also the location of the depth is irrelevant. The resistivity measured by soil samples cannot yet indicate the location of the presence of a paleochannel because the resistivity value obtained is too low and the depth of the location is too shallow so it is not in accordance with the location of the presence of paleochannel as shown by resistivity inversion modeling.

Item Type:	Thesis (Other)
Additional Information:	RSGf 551.1 Azi p-1 2019
Uncontrolled Keywords:	paleochannel, resistivity, ground samples
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography > GB1197.7 Groundwater flow. Reservoirs
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Na'imatul Hadi azizah
Date Deposited:	13 Nov 2023 03:47
Last Modified:	13 Nov 2023 03:47
URI:	http://repository.its.ac.id/id/eprint/64589

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