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Variasi Nilai Gradien Hidrolik dan Pengaruhnya terhadap Perubahan Nilai Tahanan Jenis pada Sistem Akifer Bersudut Berdasarkan Pendekatan Model Fisik Budiono Budiono; Deny Juanda Puradimaja; Sulistijo Sulistijo
Journal of Mathematical and Fundamental Sciences Vol. 35 No. 2 (2003)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2003.35.2.7

The core of this research is simulation on a physical model of inclined confined aquifer in laboratory scale. The model dimensions is 79.50 cm long, 78.00 cm wide, and 10.00 cm tall. The aquifer is simulated as single confined aquifer with thickness of 8 cm. The aquifer material is composed of coarse sand with good gradation and has uniformity coefficient of 7.105. The measurements consist of elevation head (z), pressure head (hp), total head (h), and resistivity with Schlumberger configuration. The confined aquifer layer is set up to be horizontal. Then, in order to get the hydraulic gradient and dip layer variations, the position of the model box is inclined with varied degree of: 00, 100, 200, and 270. To get the most representative result, the resistivity is measured with line spread parallel to strike and perpendicular to strike.The analysis shows that the increase of the hydraulic gradient (i) have the tendency to cause the decrease of true resistivity values (Ï). Based on the line spread direction and R2 values, there are 2 representatives equations as follows: 1). With line spread parallel to strike:4,88ln()64,60Ï=âˆ’+i;R2=0,95. 2). With line spread perpendicular to strike without correction on AB/2 and K value:Ï=;R3,80ln()58,20âˆ’+i2=0,99.

Self Potential Modeling for Investigation of Shallow Structure in Volcanic Region: a Study Case at Domas Crater, Tangkuban Parahu Volcano, West Java Wahyu Srigutomo; Alamta Singarimbun; Adhitya S. Sunarya; Prihandhanu M. Pratomo; Anggie Susilawati; Candra E. Novana; Deny Juanda Puradimaja; Eleonora Agustine
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Quantitative numerical modeling of self-potential (SP) anomaly associated with subsurface electric current density that is attributed to cross-coupling between fluid flow and electrical conductivity distributions has been conducted. The modeling scheme was applied to an area in the vicinity area of Domas crater, Tangkuban Parahu volcano in West Java. The field surveys at domas were conducted from mid-2008 until mid-2009. The main objective of this researchis to obtain a quantitative model that is possible to explain the shallow convective hydrothermal system in the eastern side of the volcano by making comparison between SP anomaly measured on the surface with theoretical anomaly resulted from modeling. Since the modeling scheme requires information on the subsurface resistivity structure, we performed measurement and interpretation of 2-D resistivity at Domas crater. The measurement of CO2 emission that is commonly associated with magmatic gas migration patterns through fracture system was also carried out on the same SP and resistivity lines. Fluid velocity vector was calculated by solving the coupled Darcy’s and energy equations involving heat transfer terms by both convection and conduction. The subsurface electric current source distribution was calculated by solving the coupled equation of velocity and potential gradients. The results show that the fluid flow patterns around Domas Crater which in addition is controlled by topographic effect; it is also influenced by thermal fluid flows through relatively high permeability zone beneath the Domas Crater.

Identifikasi Kondisi Geologi dan Kualitas Airtanah di Desa Pelauw, Kecamatan Pulau Haruku, Kabupaten Maluku Tengah Kololu, Micky; Tuasikal, Hawa; Jati, Stevanus Nalendra; Puradimaja, Deny Juanda; Limehuwey, Resti; Ulfa, Yuniarti; Purwoarminta, Ananta
Journal of Science, Technology, and Visual Culture Vol. 4 No. 1 (2024): Juli 2024
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Pemenuhan kebutuhan air di Desa Pelauw sebagian besar bergantung pada air sungai dan airtanah. Namun ada sebagian masyarakat di Desa Pelauw kesulitan mendapatkan sumber air, sebab beberapa sumur gali memiliki sifat fisik payau. Oleh karena itu, penelitian ini bertujuan untuk mengidentifikasi kondisi geologi dan kualitas airtanah di Desa Pelauw, Kecamatan Pulau Haruku. Metode yang digunakan adalah interpretasi kondisi geologi, dan parameter fisik-kimia airtanah. Selanjutnya dilakukan klasifikasi nilai tiap parameter. Hasil penelitian menunjukkan bahwa Daerah penelitian di Desa Pelauw berada pada Satuan Endapan Aluvium (Qa), Batugamping Koral (Ql), dan Batuan Gunungapi Ambon (Tpav). Sistem hidrogeologi Desa Pelauw memiliki akuifer produktivitas sedang, akuifer produktivitas tinggi-sedang, dan akuifer produktif dengan pola aliran airtanah mengalir dari arah selatan ke utara dan intensitas curah hujan menengah. Kualitas air berdasarkan Permenkes No. 492 Tahun 2010 memiliki kondisi air tawar dengan nilai EC (138-1953 µs/cm), TDS (64-872 ppm), dan salinitas (0-2,84%), kondisi air payau dengan nilai EC (2072-2712 µs/cm), TDS (1.342-2.474 ppm), dan salinitas (4,04-5,42%), pH air layak minum dengan nilai 7,30-8,42 dan pH basa pada 8,63-8,56. Sampel airtanah pada pada daerah penelitian berasal dari adanya interaksi antara air dengan material penyusun akuifer.

Analisis Kesesuaian Lahan Kawasan Permukiman dan Pertanian Ubi Kayu Berdasarkan Aspek Geologi Lingkungan di Kecamatan Teluk Ambon Baguala Kololu, Micky; Jacob, Grace Christien Julian; Puradimaja, Deny Juanda; Limehuwey, Resti; Ulfa, Yuniarti; Jati, Stevanus Nalendra; Purwoarminta, Ananta
Journal of Science, Technology, and Visual Culture Vol. 4 No. 1 (2024): Juli 2024
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Luas lahan permukiman dan pertanian semakin mengecil seiring dengan laju pertumbuhan penduduk, namun ketersediaan lahan terbatas. Perencanaan yang baik diperlukan untuk menghindari alih fungsi lahan dan memaksimalkan potensi lahan. Kecamatan Teluk Ambon Baguala mengalami laju pertumbuhan penduduk sebesar 0,72% per tahun 2010 – 2020, memiliki perencanaan pengembangan kawasan permukiman dan pertanian ubi kayu, serta potensi sumber daya dan bencana geologi. Oleh karena itu, diperlukan analisis kesesuaian lahan untuk kawasan permukiman dan pertanian ubi kayu berdasarkan aspek geologi lingkungan pada daerah tersebut. Metode SMCE (Spatial Multi-Criteria Evaluation) digunakan untuk menganalisis kesesuaian lahan. Berdasarkan analisis SMCE, kawasan permukiman terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (8,6%), cukup sesuai (23,5%), sesuai marginal (23,9%), dan tidak sesuai (41,6%) dengan luas kelas lahan sesuai 1977,15 ha dan lahan tidak sesuai 1625,15 ha. Kawasan pertanian ubi kayu terdiri dari empat kelas kesesuaian lahan, yaitu sangat sesuai (7,3%), cukup sesuai (6,1%), sesuai marginal (25,3%), dan tidak sesuai (19,7%) dengan luas kelas lahan sesuai 827,51 ha dan lahan tidak sesuai 2774,79 ha. Berdasarkan analisis prioritas kawasan, maka luas kawasan permukiman 1894,53 ha dan kawasan pertanian ubi kayu 221,98 ha.

The Carbon Footprint Estimation based on Campus Activities in ITERA (Institut Teknologi Sumatera) Kartika Sari, Novi; Gusvita, Rinda; Puradimaja, Deny Juanda
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

ITERA (Institut Teknologi Sumatera) is one of young university situated in Lampung Province, Indonesia. In 2018, the average population of campus (students, faculties, and staff) was about 9584 persons. The objective of this paper is to inventory Green House Gasses (GHGs) and then to calculate carbon footprint using equation by UI Greenmetric Guideline 2018 except for fuel and LPG consumption, paper use, and organic waste generation by using GHGs Protocol. Three scopes of GHGs emission were used to classify based on both direct and indirect source(s). The first scope was presented by LPG consumption and fuel consumption of campus’s car. Electricity consumption became scope 2 while the scope 3 involved paper use, organic waste generation including food waste and Yard trimmings, and transportation activities of both motorcycles and cars. The estimated GHGs emission was about 2846.541 metric ton CO2eq during 2018-2019 (one year) with the portion of each scope resulting 10.2%, 62%, and 28.2%, respectively. Electricity usage was being the highest contributor of carbon footprint. The inventory of GHGs will help top management of campus to evaluate and determine some strategies for minimization, reduction, and mitigation notably in electricity sector by some strategies such as substituting electric devices into eco-friendly products, applying energy management ISO 50001, and others.

Forecasting of Using Electricity Consumption at ITERA (Institut Teknologi Sumatera) until 2025, to Improve Application of Renewable Energy in Lampung Province Baqaruzi, Syamsyarief; Muhtar, Ali; Puradimaja, Deny Juanda
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

Institut Teknologi Sumatera (ITERA) is a new campus located in Lampung province- Indonesia. It is almost 6 years old, within large data on the total population human activity in this 275-hectare campus around 9500 persons, so that necessary to forecasting energy demand in the future, ITERA can project programs that are in line with the Indonesian government, specifically increasing using of renewable energy. which the government has a national energy policy in 2025 of 23%. Mostly in Lampung province, the electricity produced is still dominated by fossil energy (e.g., coal, diesel, etc), therefore as a campus with a technological background, ITERA must be able to bring a paradigm shift to be used from electricity consumption in the surrounding areas. The results of this study will project electricity usage in ITERA over the next 5 year, where electricity usage in ITERA 2019 is 2.472 GWh or 6,775 KWh/day, expected with a development strategy to implementing the efficiency of green energy, so that can meet the challenges of reducing CO2 emissions and energy-saving behavior, also keep sustainable impact for Indonesia.

Hydrogeology and Groundwater Potential in The Sirimau District, Ambon City, Maluku Province Matrutty, Michelle Theodora; Kololu, Micky; Limehuwey, Resti; Purwoarminta, Ananta; Ulfa, Yuniarti; Jati, Stevandrus Nalendra; Puradimaja, Deny Juanda
EKSPLORIUM Vol. 45 No. 2 (2024): NOVEMBER 2024
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2024.7050

The demand for clean water in Sirimau District is the highest among all districts in Ambon City, with a total of 14.6 million liters per day for 146,453 people. Moreover, the demand for clean water is increasing with population growth. Therefore, research on hydrogeology and groundwater potential is necessary. The study aims to analyze the discharge and quality of groundwater. The methods used include field surveys, geoelectric measurements, and the analysis of physical and chemical water parameters. The geology of Sirimau district can be divided into five units: Kanikeh Formation, Ultramafic Rock, Ambon Volcanic Rock, Coral Limestone, and Alluvium. Unconfined aquifers are identified in three geological units: the Ambon Volcanic Rock, Alluvium and Coral Limestone, while confined aquifers are in the Ultramafic Rock and the Kanikeh Formation. The water facies are calcium magnesium bicarbonate and sodium-potassium chloride sulfate facies. The groundwater flow in Sirimau District has a northwest flow direction with an average hydraulic gradient of 0.0104. The groundwater discharge in the unconfined aquifer of the Ambon Volcanic Rock is 30 l/s, which is classified as a large discharge. The water quality from physical parameters does not exceed the maximum limit except for three sampling points. In contrast, the chemical content mostly does not exceed the maximum limit except at one drilled well location. Three springs develop due to fractures, while another occurs due to contact.

ANALISIS KESESUAIAN LAHAN UNTUK PERMUKIMAN DAN PARIWISATA BERDASARKAN ASPEK GEOLOGI LINGKUNGAN DENGAN METODE SPATIAL MULTI-CRITERIA EVALUATION (SMCE) DI DAERAH KECAMATAN NUSANIWE, KOTA AMBON Kololu, Micky; Ferdinandus, Giovanny; Limehuwey, Resti; Puradimaja, Deny Juanda; Ulfa, Yuniarti; Purwoarminta, Ananta; Jati, Stevanus Nalendra
Journal of Science, Technology, and Visual Culture Vol. 5 No. 2 (2025): Oktober 2025
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Lahan adalah sumber daya yang terbatas dan harus dimanfaatkan sesuai dengan daya dukung lingkungannya. Kecamatan Nusaniwe memiliki potensi sumber daya geologi dan rawan akan bencana geologi, sehingga diperlukan analisis kesesuaian lahan terutama untuk permukiman dan pariwisata. Beberapa hal yang menjadi alasan penelitian ini dilakukan antara lain; pembangunan permukiman pada Kecamatan ini belum merata, terdapat banyak lokasi pariwisata dan morfologinya di dominasi oleh lereng yang curam dan pesisir pantai. Penelitian ini menggunakan metode Spatial Multi-Criteria Evaluation (SMCE) untuk menganalisis kesesuaian lahan permukiman dan pariwisata. Dari hasil penelitian, menunjukkan bahwa lahan yang sesuai untuk dijadikan lokasi pembangunan permukiman, antara lain; 0.7 km² di Desa Amahusu, 1.25 km² di Negeri Nusaniwe, 1.5 km² di Desa Latuhalat, 0.07 km² di Kelurahan Waihaong, 2.04 km² di Negeri Urimessing, 0.2 km² di Kelurahan Mangga Dua, 0.1 km² di Kelurahan Urimessing, 0.45 km² di Kelurahan Kudamati, 0.41 km² di Negeri Seilale, 0.6 km² di Kelurahan Benteng, dan 0.32 km² di Kelurahan Nusaniwe. Sedangkan untuk pariwisata terdapat empat lokasi yang cukup sesuai dan memiliki nilai keragaman geologi (geodiversity) yaitu Bukit Paralayang, Pantai Pintu Kota, Pantai Tanjung Nusaniwe dan Pantai Batu Lubang. Keempat lokasi ini berpotensi untuk dilakukan pengembangan geopark pada kawasan wisata tersebut.

Forecasting of Using Electricity Consumption at ITERA (Institut Teknologi Sumatera) until 2025, to Improve Application of Renewable Energy in Lampung Province Syamsyarief Baqaruzi; Ali Muhtar; Deny Juanda Puradimaja
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

Institut Teknologi Sumatera (ITERA) is a new campus located in Lampung province- Indonesia. It is almost 6 years old, within large data on the total population human activity in this 275-hectare campus around 9500 persons, so that necessary to forecasting energy demand in the future, ITERA can project programs that are in line with the Indonesian government, specifically increasing using of renewable energy. which the government has a national energy policy in 2025 of 23%. Mostly in Lampung province, the electricity produced is still dominated by fossil energy (e.g., coal, diesel, etc), therefore as a campus with a technological background, ITERA must be able to bring a paradigm shift to be used from electricity consumption in the surrounding areas. The results of this study will project electricity usage in ITERA over the next 5 year, where electricity usage in ITERA 2019 is 2.472 GWh or 6,775 KWh/day, expected with a development strategy to implementing the efficiency of green energy, so that can meet the challenges of reducing CO2 emissions and energy-saving behavior, also keep sustainable impact for Indonesia.

The Carbon Footprint Estimation based on Campus Activities in ITERA (Institut Teknologi Sumatera) Novi Kartika Sari; Rinda Gusvita; Deny Juanda Puradimaja
Journal of Sustainability Perspectives Vol 1, No 3 (2021)
Publisher : Universitas Diponegoro

ITERA (Institut Teknologi Sumatera) is one of young university situated in Lampung Province, Indonesia. In 2018, the average population of campus (students, faculties, and staff) was about 9584 persons. The objective of this paper is to inventory Green House Gasses (GHGs) and then to calculate carbon footprint using equation by UI Greenmetric Guideline 2018 except for fuel and LPG consumption, paper use, and organic waste generation by using GHGs Protocol. Three scopes of GHGs emission were used to classify based on both direct and indirect source(s). The first scope was presented by LPG consumption and fuel consumption of campus’s car. Electricity consumption became scope 2 while the scope 3 involved paper use, organic waste generation including food waste and Yard trimmings, and transportation activities of both motorcycles and cars. The estimated GHGs emission was about 2846.541 metric ton CO2eq during 2018-2019 (one year) with the portion of each scope resulting 10.2%, 62%, and 28.2%, respectively. Electricity usage was being the highest contributor of carbon footprint. The inventory of GHGs will help top management of campus to evaluate and determine some strategies for minimization, reduction, and mitigation notably in electricity sector by some strategies such as substituting electric devices into eco-friendly products, applying energy management ISO 50001, and others.

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