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Imputing Rainfall Data for Flood Simulation in Citarum River, West Java Muhammad Yoga Pratama; Stevanus Nalendra Jati; Muhammad Rendana
Sriwijaya Journal of Environment Vol 8, No 1 (2023): NATURAL RESOURCES MANAGEMENT
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22135/sje.2023.8.1.12-20

The central role of the Citarum River as a buffer to meet the needs of agricultural irrigation, industrial activities, and raw water in the six surrounding districts, including 80% of the population of Jakarta, has experienced a decline in conditions from up-downstream. That way, a lot of data is available regarding the adaptation of floods, drought, and other water source functions for an integrated concept for Citarum. The focus of the study is in the Central Citarum Zone by using 5 and 10 years of rainfall intensity (time series), actualizing the runoff coefficient, Intensity Duration Frequency (IDF) modeling to the formulation of the peak runoff discharge. This achievement is realized by applying Gumbel's Method and Mononobe's Equation and optimizing the 2D HEC-RAS software. Experimental data from 2010 to 2019 indicated that November was the highest rainfall of 448.07 mm/hour, while the lowest was in July with a value of 52.50 mm/hour. The simulation results show an increase in flow rate up to 11%, which means it affects the river's capacity to accommodate the overflow load. Furthermore, this simulation is equipped with a map of the flood-affected areas with a peak discharge scenario in November.

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.

Socialization of mangrove planting among coastal communities: A collaborative approach for conservation and ecosystem sustainability Muhammad Izzudin; Muhammad Rendana; Stevanus Nalendra Jati; Ramdan Lamato; Indra Tamsyah
Community Empowerment Vol 9 No 9 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.11267

Mangrove planting has been widely recognized as an effective strategy for coastal environmental conservation. However, the success of mangrove planting programs depends not only on technical aspects but also on the active participation and understanding of local communities. The community service method used in this study was socialization. The results of this program showed that 50% of participants were very satisfied, creating a sustainable relationship between coastal communities, the government, and Sriwijaya University in efforts to maintain mangrove sustainability for a better future. In addition, the planted mangrove trees are expected to become resistant to seawater abrasion and provide habitat for fauna that serve as a source of livelihood for local fishermen in the next 10 years.

ASAL USUL FLUIDA MANIFESTASI PANAS BUMI DAN ESTIMASI TEMPERATUR RESERVOIR DENGAN PENDEKATAN ANALISIS ISOTOP PADA DAERAH DANAU RANAU, OGAN KOMERING ULU (OKU) SELATAN, SUMATERA SELATAN: ORIGIN OF GEOTHERMAL MANIFESTATION FLUID AND DETERMINATION OF RESERVOIR TEMPERATURE USING ISOTOPE ANALYSIS APPROACH IN THE LAKE RANAU AREA, SOUTH OGAN KOMERING ULU (OKU), SOUTH SUMATERA Ibrahim, Mochamad Malik; Harnani, Harnani; Jati, Stevanus Nalendra; Abiyyu, Rayhan Khairunnan
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.467

The geothermal potential of the Lake Ranau area comes from the remains of magmatic activity from Mount Seminung. The geothermal manifestation in this area is in the form of hot springs which are thought to arise through geological structures. The existence of geothermal fluid manifestations is very interesting to research, especially regarding the origin and estimation of reservoir temperature using the δ18O and δ2H isotope composition approach. It is important to know the origin of fluid manifestations to determine the potential of geothermal systems from surface manifestations fluid related to magmatic, evaporation or rock interactions. This research method uses isotope analysis to determine the origin of geothermal fluid manifestations and isotope geothermometer to estimate reservoir temperature. Isotope sampling in geothermal manifestation fluids in Kota Batu Village was 3 samples and Lombok Village was 3 samples. The results of isotope analysis on the relationship graph between δ18O and δ2H show that all isotope samples in geothermal manifestation fluids come from meteoric water. The local meteoric water line value equation has a difference in the deuterium excess (DE) value compared to the global meteoric water line value equation. This change in DE value is due to the interaction and mixing process between geothermal fluid and rock (connate water) with the source of evaporation and precipitation from Lake Ranau. The results of isotope geothermometer calculations based on the isotope fractionation factor, it is estimated that the reservoir temperature is around ± 270 0C. Reservoir temperature estimates show that all isotope samples in geothermal manifestation fluids are classified as high temperatures.

Diagenetic Controls on Porosity in Sandstones of the Talang Akar Formation: A Case Study from the Rambangnia River Track, South OKU, South Sumatra Rochmana, Yogie Zulkurnia; Jati, Stevanus Nalendra; Puspita, Mega; Idarwati, Idarwati; Pranata, Ridho
Jurnal IPTEK Vol 29, No 1 (2025): May
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2025.v29i1.6746

Porosity contributes to fluid storage and determines reservoir quality. The higher the porosity, the more free space is available to store fluid. However, the porosity of reservoirs, particularly the sandstones of the Talang Akar Formation of the Rambangnia River track, is not always good. The diagenetic process in the formation of sandstones is thought to contribute to variations in porosity quality. This study aims to determine the control of diagenesis on the porosity of sandstones of the Talang Akar Formation of the Rambangnia River, South Sumatra. The research methods used were field observation, petrographic, diagenesis, and porosity analysis. Based on petrographic analysis, the study area has three types of sandstone: lithic wacke, sublitharenite, and litharenite. The study of diagenesis shows that the sandstones in the Rambangnia River’s Talang Akar Formation have gone through an intense compaction phase, dissolution, cementation by silica and calcite minerals, and an authigenic phase in clay minerals. In general, the porosity of rocks in the study area ranges from fair to good.

Green the Islamic boarding school: Eco enzyme training for organic waste management Rendana, Muhammad; Susanti, Susi; Yandriani, Yandriani; Jati, Stevanus Nalendra; Renaldi, Fadhlurrahman; Akbar, M. Naufal
Community Empowerment Vol 10 No 4 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.13150

The issue of organic waste, which predominantly originates from households and is also generated by educational institutions such as schools, has the potential to cause environmental impacts if not managed properly. Organic waste holds significant potential to be processed into eco enzyme, which has various benefits. Recognizing this potential, this community service program aimed to empower the community at Pondok Pesantren At Tauhiid, Indralaya, South Sumatra, through eco enzyme production training. The methodology employed in this activity included lectures and direct practical training. The program results indicated a 60% increase in understanding regarding eco enzyme production after participating in the training, which utilized leftover fruit and vegetable waste. This program is expected to serve as a community empowerment model for independent organic waste management, particularly within educational institution environments.

Pengaruh Perubahan Tutupan Lahan Rawa dan Ruang Terbuka Hijau terhadap Peningkatan Debit Limpasan di Kota Palembang Alia, Febrinasti; Hakki, Helmi; Jati, Stevanus Nalendra; Fakhriansyah, M
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1282

Abstrak Perubahan penggunaan lahan dari lahan non terbangun menjadi lahan terbangun akan menyebabkan terjadinya peningkatan limpasan atau aliran permukaan. Peningkatan debit puncak untuk masing-masing periode ulang tahunan disebabkan oleh berubahnya nilai koefisien limpasan (C) yang pada akhirnya meningkatkan persentase curah hujan yang menjadi limpasan permukaan. Penelitian ini difokuskan untuk memprediksi tren perubahan tutupan lahan berdasarkan ketersediaan data historis di lokasi studi yaitu antara tahun 2018, 2019 dan 2021 dengan menggunakan metode supervised maximum likelihood classification (MLC) dengan perangkat lunak ArcGIS terutama pada wilayah dengan persentase rawa terbesar di kota Palembang. Hasil analisa tutupan lahan pada DAS Kertapati menghasilkan perubahan lahan yang meningkat signifikan pada kelas tutupan lahan permukaan diperkeras yaitu 7% (2018) menjadi 12% (2021). Namun peningkatan luasan area vegetasi budidaya berupa sawah juga meningkat dari 41% (2018) menjadi 49% (2021). Analisis perhitungan debit banjir menggunakan metode Hidrograf Satuan Sintetis Soil Conservation Service dan distribusi hujan Alternating Block Method (ABM). Didapatkan pada tahun 2018 nilai debit banjir untuk periode 10 tahun sebesar 29,167 m3/det, kemudian untuk tahun 2019 nilai debit banjir untuk periode 10 tahun sebesar 34,820 m3/det dan untuk tahun 2021 nilai debit banjir untuk periode 10 tahun sebesar 34,169 m3/det. Kata kunci: limpasan, perubahan tutupan lahan, debit rencana, hidrograf Abstract Changes in land cover from undeveloped to developed areas lead to an increase in runoff or surface flow. The rise in peak discharge for each annual return period is attributed to changes in the runoff coefficient (C), which increases the percentage of rainfall contributing to surface runoff. This study aims to predict trends in land cover change based on the availability of historical data from 2018, 2019 and 2021, utilizing the supervised maximum likelihood classification (MLC) method with ArcGIS software, particularly in regions with the biggest wetlands in Palembang City. The results of the land cover analysis in the Kertapati Watershed revealed a significant increase in the impervious surface, rising from 7% in 2018 to 12% in 2021. Conversely, the area of cultivated vegetation, specifically rice fields, also increased from 41% in 2018 to 49% in 2021. To analyze flood discharge, the study employed the Soil Conservation Service Synthetic Unit Hydrograph method and the Alternating Block Method (ABM) for rainfall distribution. The findings indicated that the flood discharge value for a 10-year return period was 29.167 m³/sec in 2018, increasing to 34.820 m³/sec in 2019 and slightly decreasing to 34.169 m³/sec in 2021. Keywords: runoff, land cover change, design discharge, hydrograph

ASAL USUL FLUIDA MANIFESTASI PANAS BUMI DAN ESTIMASI TEMPERATUR RESERVOIR DENGAN PENDEKATAN ANALISIS ISOTOP PADA DAERAH DANAU RANAU, OGAN KOMERING ULU (OKU) SELATAN, SUMATERA SELATAN: ORIGIN OF GEOTHERMAL MANIFESTATION FLUID AND DETERMINATION OF RESERVOIR TEMPERATURE USING ISOTOPE ANALYSIS APPROACH IN THE LAKE RANAU AREA, SOUTH OGAN KOMERING ULU (OKU), SOUTH SUMATERA Ibrahim, Mochamad Malik; Harnani, Harnani; Jati, Stevanus Nalendra; Abiyyu, Rayhan Khairunnan
Buletin Sumber Daya Geologi Vol 19 No 3 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i3.467

The geothermal potential of the Lake Ranau area comes from the remains of magmatic activity from Mount Seminung. The geothermal manifestation in this area is in the form of hot springs which are thought to arise through geological structures. The existence of geothermal fluid manifestations is very interesting to research, especially regarding the origin and estimation of reservoir temperature using the δ18O and δ2H isotope composition approach. It is important to know the origin of fluid manifestations to determine the potential of geothermal systems from surface manifestations fluid related to magmatic, evaporation or rock interactions. This research method uses isotope analysis to determine the origin of geothermal fluid manifestations and isotope geothermometer to estimate reservoir temperature. Isotope sampling in geothermal manifestation fluids in Kota Batu Village was 3 samples and Lombok Village was 3 samples. The results of isotope analysis on the relationship graph between δ18O and δ2H show that all isotope samples in geothermal manifestation fluids come from meteoric water. The local meteoric water line value equation has a difference in the deuterium excess (DE) value compared to the global meteoric water line value equation. This change in DE value is due to the interaction and mixing process between geothermal fluid and rock (connate water) with the source of evaporation and precipitation from Lake Ranau. The results of isotope geothermometer calculations based on the isotope fractionation factor, it is estimated that the reservoir temperature is around ± 270 0C. Reservoir temperature estimates show that all isotope samples in geothermal manifestation fluids are classified as high temperatures.

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.

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