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Wahidah Wahidah
Universitas Mulawarman
Earth & Planetary Sciences

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Studi Identifikasi Sebaran Ion Logam Pb, Cu, As dan Cd pada Air dan Sedimen di Perairan Bontang Kalimantan Timur Menggunakan Metode Kriging (Ordinary Kriging) ani, ani ani; Wahidah, Wahidah; Mandang, Idris
GEOSAINS KUTAI BASIN Vol 6 No 1 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i1.1001

Abstract

Bontang is one of the cities in East Kalimantan which is geographically located in coastal areas so that it is very vulnerable to marine pollution both from domestic human and industrial activities. This study aims to determine the level and pattern of distribution of poluton metal ions Pb, Cu, As and Cd in water and sediments in Bontang waters using the Kriging (Ordinary Kriging) method. In this study, 4 observation samples were used which were tested in the laboratory to determine the content of heavy metals. Furthermore, the data from laboratory tests along with 4 secondary data were interpolated using the ordinary kriging method with an exponential model to determine the pattern of contour distribution in Bontang waters. The results showed that the heavy metal with the highest distribution value in water and sediment is cadmium with a susceptibility value ranging from 0.006 mg/l to 9.070 mg/l. In general, the pattern of spread of heavy metals originates from coastal areas in a southeasterly direction. The most influential thing on this pattern of spread is tidal currents and bathymetry.
Perbandingan Nilai Resistivitas Menggunakan Metode Logging Resistivitas Listrik dan Electrical Resistivity Tomography (ERT) Antony, Nurvani; Lepong, Piter; Wahidah, Wahidah; Supriyanto, Supriyanto; Djayus, Djayus
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1094

Abstract

Metode geolistrik sering digunakan untuk menginterpretasikan lapisan bawah permukaan yang dangkal. Namun dalam kenyataannya, metode ini memberikan pengukuran resistivitas bawah permukaan yang berbeda dengan metode log resistivitas. Selain itu, metode ini memiliki kelemahan dalam membaca lapisan tipis saat kedalaman pengukuran bertambah. Oleh karena itu, dilakukan penelitian ini untuk membandingkan metode geolistrik dan log resistivitas, serta menentukan faktor-faktor yang menyebabkan perbedaan pengukuran tersebut. Penelitian ini menggunakan data sekunder yang nantinya diolah menggunakan software tertentu. Data geolistrik diolah menggunakan Res2DINV untuk memperoleh penampang resistivitas 2D. Kemudian data log resistivitas diolah menggunakan WellCAD untuk memperoleh kurva resistivitas. Kedua hasil tersebut digabungkan dalam satu gambar untuk dibandingkan dan dianalisis perbedaannya. Hasil yang diperoleh menunjukan bahwa nilai resistivitas semu yang ditampilkan penampang geolistrik lebih kecil dibandingkan kurva resistivitas milik log resistivitas. Selain itu, terdapat sedikit perbedaan interpretasi antara keduanya, dimana metode geolistrik tidak dapat membaca lapisan tipis yang cukup dalam, seperti batubara, dan metode log resistivitas tidak dapat membaca lapisan clay.
Analisis Potensi Swabakar (Self-Combustion) Berdasarkan Data Proksimat pada Batubara PT. Geoservices Samarinda Wahidah, Wahidah; Fajarwati, Delia Aurora; Lepong, Piter; Alamsyah, Andi
GEOSAINS KUTAI BASIN Vol 5 No 2 (2022)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v5i2.1062

Abstract

The self-combustion phenomenon that has the potential to cause fires in the coal mining industry in East Kalimantan is the subject of this study. The purpose of this study is to determine the quality and characteristics of coal that has the potential to trigger self-heating. In this research, 5 (five) samples of coal quality are analyzed from PT. Geoservice Samarinda using the proximate analysis method and analysis of calorific value and total sulfur. Next, determine ranking of coal and analyze the characteristics of coal samples that are prone to potential self-combustion. The results show that the five coal samples included in Sub-Bituminous rank with medium volatile matter considered to have sufficient potential to experience self-combustion. The most susceptible coal sample is sample code D1 because it also has lower inherent moisture and ash content and higher total sulfur content than other coal samples. However, further tests still need to be carried out to determine the percentage of total sulfur (pyrite) as a trigger for self-combustion. Environmental factor analysis is also required for validation.
Penentuan Litologi Batuan di Daerah Samboja Berdasarkan Analisis Pemodelan 3D Data Cutting dan Data Logging Geofisika Situmeang, Edberg; Djayus, Djayus; Wahidah, Wahidah; Supriyanto, Supriyanto; Lepong, Piter
GEOSAINS KUTAI BASIN Vol. 6 No. 2 (2023)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v6i2.1087

Abstract

The interpretation of rock lithology is inaccurate if it only uses cutting data, so it must be assisted with other data, including logging data. The purpose of this study was to determine the lithological arrangement of rocks based on cutting data and logging data and to compare the cross section results of cutting data and logging data. This study uses cutting data and logging data (gamma ray log and density log). Cutting data and logging data will be interpreted and processed into 2D and 3D sections which are corrected with topographical data including coordinates, elevation values, strike dip and total depth. The results of processing from both methods, obtained lithology composition in the form of soil, silt, sand, coal, clay, carbon and carbont clay.
Subsurface Characterization using Electrical Resistivity Tomography (ERT) for Sponge City Planning in Nusantara Capital City (IKN), Indonesia: Karakterisasi Bawah Permukaan Menggunakan Geolistrik Resistivitas (ERT) untuk Perencanaan Kota Spons di Ibu Kota Nusantara (IKN), Indonesi Wahidah, Wahidah; Lepong, Piter; Supriyanto, Supriyanto; Djayus, Djayus; Firdaus, Muhamad Akmal; Azisyarlina, Dwi
JURNAL GEOCELEBES Vol. 9 No. 2: October 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i2.47083

Abstract

Clay shale dominates the lithology along access roads in the IKN development area. Its impermeable nature poses challenges to implementing the Sponge City concept, which relies on enhanced rainwater absorption to reduce surface runoff. This study aims to map the spatial distribution of clay shale and assess its implications for Sponge City planning. The geoelectrical resistivity method was applied at three sites, each consisting of one long section and three cross sections. Resistivity contrasts were used to delineate subsurface lithology, producing two- and three-dimensional models. The results reveal three main lithological units: topsoil, clay shale, and sandy clay. Topsoil shows heterogeneous resistivity values with thicknesses ranging from <1 m to 5 m. Clay shale exhibits resistivity values below 50 Ωm and thicknesses of <5–30 m, while sandy clay exceeds 50 Ωm with variable thicknesses up to 30 m. The thick, low-resistivity clay shale indicates poor permeability, which limits infiltration and groundwater storage. These findings suggest that the IKN area is less suitable for a natural sponge system. Therefore, stormwater management should prioritize engineered solutions such as green roofs, retention ponds, and bioretention facilities to control runoff and support sustainable urban development.
Subsurface Characterization using Electrical Resistivity Tomography (ERT) for Sponge City Planning in Nusantara Capital City (IKN), Indonesia: Karakterisasi Bawah Permukaan Menggunakan Geolistrik Resistivitas (ERT) untuk Perencanaan Kota Spons di Ibu Kota Nusantara (IKN), Indonesi Wahidah, Wahidah; Lepong, Piter; Supriyanto, Supriyanto; Djayus, Djayus; Firdaus, Muhamad Akmal; Azisyarlina, Dwi
JURNAL GEOCELEBES Vol. 9 No. 2: October 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i2.47083

Abstract

Clay shale dominates the lithology along access roads in the IKN development area. Its impermeable nature poses challenges to implementing the Sponge City concept, which relies on enhanced rainwater absorption to reduce surface runoff. This study aims to map the spatial distribution of clay shale and assess its implications for Sponge City planning. The geoelectrical resistivity method was applied at three sites, each consisting of one long section and three cross sections. Resistivity contrasts were used to delineate subsurface lithology, producing two- and three-dimensional models. The results reveal three main lithological units: topsoil, clay shale, and sandy clay. Topsoil shows heterogeneous resistivity values with thicknesses ranging from <1 m to 5 m. Clay shale exhibits resistivity values below 50 Ωm and thicknesses of <5–30 m, while sandy clay exceeds 50 Ωm with variable thicknesses up to 30 m. The thick, low-resistivity clay shale indicates poor permeability, which limits infiltration and groundwater storage. These findings suggest that the IKN area is less suitable for a natural sponge system. Therefore, stormwater management should prioritize engineered solutions such as green roofs, retention ponds, and bioretention facilities to control runoff and support sustainable urban development.
Co-Authors Alamsyah, Andi ani, ani ani Antony, Nurvani azisyarlina, Dwi Djayus, Djayus Fajarwati, Delia Aurora Firdaus, Muhamad Akmal Idris Mandang, Idris Lepong, Piter Situmeang, Edberg Supriyanto Supriyanto