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Doni Prakasa Eka Putra
Departemen Teknik Geologi, Fakultas Teknik, Universitas Gadjah Mada
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HIDROGEOLOGI DAN HIDROKIMIA AIR TANAH PADA AREA PENAMBANGAN EMAS TRADISIONAL DI WILAYAH KALIREJO, KOKAP, KULON PROGO, DAERAH ISTIMEWA YOGYAKARTA Listiyastuti, Riana; Simamora, Lestari Sutra; Ilham, Muhamad; Warmada, I Wayan; Putra, Doni Prakasa Eka
Jurnal Geosaintek Vol. 11 No. 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i1.2352

Abstract

Kondisi air tanah di suatu daerah secara alami dipengaruhi oleh faktor geologi dan hidroklimatologi namun dapat berubah akibat aktivitas manusia. Daerah penelitian berada di Kalirejo, Kokap, Kulon Progo yang secara geologi tersusun oleh litologi batuan beku intrusi beserta dengan produk alterasi dan mineralisasinya. Alterasi dan mineralisasi di area ini berasosiasi dengan potensi emas, sehingga banyak dijumpai tambang emas dan pengolahan emas skala kecil yang dikelola masyarakat. Berdasarkan litologinya, hidrogeologi Kalurahan Kalirejo merupakan daerah air tanah langka. Penelitian ini bertujuan untuk menentukan model konseptual hidrogeologi di wilayah ini dan karakteristik hidrokimia air tanahnya melalui evaluasi data geologi, analisis sifat fisika-kimia, serta analisis kandungan ion mayor pada air tanah dalam keterkaitan dengan dampak kegiatan pertambangan terhadap air tanah. Observasi lapangan dan 28 sampel air tanah telah diambil mewakili kondisi geologi dan kegiatan tambang emas. Analisis data  geologi primer dan sekunder serta analisis menggunakan Ion Chromatography (IC) dan titrasi dilakukan untuk sampel air. Hasil penelitian menunjukkan bahwa sebagian besar air tanah di area penelitian memiliki karakteristik yang serupa, yakni berasal dari akuifer dangkal yang terbentuk dari hasil pelapukan dan rekahan batuan (fractured rock aquifer). Pada beberapa area di daerah penelitian terdapat anomali kandungan sulfat pada air tanah yang cukup tinggi yang disebabkan oleh pelarutan dari mineral sulfat dan sulfida yang intensif dalam kaitannya dengan proses alterasi hidrotermal serta pembentukan air asam tambang akibat aktivitas penambangan yang ada.
Application of DRASTIC Method for Groundwater Vulnerability Analysis to Contamination in Pemalang District, Pemalang Regency, Central Java Province, Indonesia Firginawan Surya Wanda; Doni Prakasa Eka Putra; Wahyu Wilopo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.22209

Abstract

Pemalang District, Pemalang Regency, Central Java Province, as the district's capital, has experienced rapid economic and population growth. This has resulted in increased exploitation and degradation of groundwater quality, with groundwater extraction increasing from 91,856 m³ to 133,708 m³. There was an average decrease in groundwater levels of 40-70 cm from 2020 to 2023, and an increase in nitrate and chloride levels in groundwater was recorded from 2021 to 2023. To maintain the availability of groundwater that is suitable for use, efforts are needed to prevent groundwater contamination in vulnerable areas. The approach applied to examine groundwater vulnerability to contamination is the DRASTIC method. The research location is a coastal area composed of quaternary deposits with lithology consisting of sand and gravel in the south and clay and silt in the north. It has a shallow groundwater depth and a groundwater flow pattern that flows from south to north. The results of the geospatial analysis revealed two zones of groundwater vulnerability to contamination, based on the DRASTIC Index value, consisting of moderate vulnerability   (>106-146) and high vulnerability (>146-186). There were 67.4% of high vulnerability zones in this research area, spread from the central part, which is Wanamulya Village, to the southern part, which is Surajaya Village.
Spatiotemporal analysis of groundwater level trends and recharge rate estimation in the unconfined aquifer of Yogyakarta-Sleman Groundwater Basin, Indonesia Razi, Muhammad Haikal; Wilopo, Wahyu; Putra, Doni Prakasa Eka
Journal of Degraded and Mining Lands Management Vol. 11 No. 1 (2023)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2023.111.4887

Abstract

Groundwater is the primary water resource used for domestic, industrial, and agricultural needs for the community in the Yogyakarta-Sleman Groundwater Basin area. The urbanization rate has increased since the 1970s and has made massive use of groundwater, causing environmental problems, including the quality and quantity of groundwater. Therefore, this study aimed to investigate the spatiotemporal groundwater fluctuation trends based on the non-parametric Mann-Kendall test and recharge rate estimation using the water table fluctuation (WTF) method. The groundwater level data were collected from monitoring wells across the study area during 2018-2022, particularly emphasizing 8 wells representing recharge, transition, and discharge areas. The results showed that the groundwater fluctuation pattern generally followed the season. During the rainy season from January to April, groundwater reached the shallowest level and began to decline gradually when it entered the dry season from May to October. Groundwater recharge rate was estimated to vary from 171.49 to 1,505.56 mm/year. Meanwhile, the Mann-Kendall test showed that most of the Yogyakarta-Sleman Groundwater Basin area did not experience significant fluctuation trends, except for two monitoring wells in the center of Yogyakarta City which had increasing groundwater level trends. The rising groundwater levels were expected to be caused by urban wastewater recharge. This study has provided a new description and insights into spatiotemporal changes in the groundwater table and the quantification of groundwater recharge.
KUALITAS AIR TANAH DI KOTA GORONTALO: INTEGRASI BERBASIS SISTEM INFORMASI GEOGRAFIS MELALUI KETERKAITAN UNIT GEOMORFOLOGI DAN PARAMETER FISIK-KIMIA AIR TANAH Siti Suhartini S Napu; Wahyu Wilopo; Doni Prakasa Eka Putra
Jurnal Geosaintek Vol. 12 No. 2 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i2.8787

Abstract

Penelitian terdahulu terkait kualitas air tanah di Kota Gorontalo, umumnya masih bersifat lokal, deskriptif, tanpa mengaitkannya dengan unit geomorfologi Kota Gorontalo. Oleh karena itu, makalah ini bertujuan untuk mengaitkan karakteristik kualitas air tanah dengan unit geomorfologi menggunakan pendekatan Sistem Informasi Geografis (SIG). Data kualitas air tanah yang digunakan adalah sifat fisik-kimia berupa Total Zat Padat Terlarut/TDS, Daya Hantar Listrik/DHL, warna, bau, rasa dan pH. Data diperoleh dari 63 titik sumur gali, sedangkan unit geomorfologi hasil interpretasi DEMNAS dan observasi lapangan. Semua parameter direklasifikasi berdasarkan standar baku mutu air minum dan digabungkan secara spasial untuk menghasilkan peta kualitas air tanah Kota Gorontalo. Hasil penelitian menunjukkan nilai TDS >300 mg/L dan DHL >750 µS/cm ditemukan pada satuan perbukitan intrusi, piroklastik, karst, dataran danau, dan pantai. Sebaliknya, nilai TDS dan DHL yang sesuai standar ditemukan pada dataran aluvial dan banjir. Nilai pH >8,5 diidentifikasi pada dataran pantai dan beberapa titik lokal di dataran aluvial. Peta kualitas air tanah menunjukkan gradasi dari zona air tanah layak menuju zona air tanah cukup layak dan zona air tanah tidak layak sejalan dengan perubahan unit geomorfologi. Air tanah dengan kualitas terbaik terkonsentrasi pada unit geomorfologi dataran aluvial dan banjir di bagian utara dan timur Kota Gorontalo, yang termasuk dalam kategori layak. Secara keseluruhan, penelitian kualitas air tanah di Kota Gorontalo dipengaruhi oleh kombinasi kondisi geomorfologi, interaksi air dengan batuan sekitar, serta keterbatasan pengimbuhan lokal. Pendekatan integrasi berbasis SIG ini dapat diterapkan di kota-kota tropis lainnya sebagai dasar perencanaan konservasi zona resapan dan pengendalian pencemaran air tanah.
KAJIAN KETERKAITAN TINGKAT KEKRITISAN DAERAH RESAPAN AIR TERHADAP KEJADIAN BANJIR DI KOTA BALIKPAPAN Doni Prakasa Eka Putra; Esa Pradindra Fassa Zaini Zam Zam; Dessy Fitrianita; Alih Janu Putra; Fitria Majid; Arief Bandoro Sigit
Jurnal Geosaintek Vol. 12 No. 2 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v12i2.9064

Abstract

Kota Balikpapan merupakan salah satu wilayah dengan tingkat urbanisasi tertinggi di Provinsi Kalimantan Timur. Perkembangan pesat kawasan terbangun di kota ini menyebabkan berkurangnya daerah resapan air yang berperan penting dalam menjaga keseimbangan hidrologi. Penurunan kemampuan lahan dalam meresapkan air hujan berkontribusi terhadap kejadian banjir dengan total 88 kasus tercatat pada periode 2019–2024 di Kota Balikpapan. Penelitian ini bertujuan untuk mengidentifikasi zona tingkat kekritisan daerah resapan air dan menganalisis keterkaitannya dengan kejadian banjir. Analisis dilakukan dengan mengintegrasikan metode Analytical Hierarchy Process (AHP) dan Sistem Informasi Geografis (SIG) menggunakan empat parameter berupa tata guna lahan, laju infiltrasi, kemiringan lereng, dan kedalaman muka air tanah. Hasil analisis menunjukkan bahwa Kota Balikpapan didominasi oleh tingkat kekritisan baik. Validasi lapangan menunjukkan adanya keterkaitan antara tingkat kekritisan daerah resapan air dengan wilayah bahaya banjir. Kajian ini dapat menjadi dasar dalam perencanaan tata ruang dan strategi mitigasi banjir berkelanjutan di Kota Balikpapan.
Zoning of Groundwater Vulnerability to Seawater Intrusion Using Modified GALDIT Method in the Coastal Aquifer of Kendari Bay, Southeast Sulawesi Fandy Irvansyah; Doni Prakasa Eka Putra; Wahyu Wilopo
Journal of Applied Geology Vol 10, No 2 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.112764

Abstract

Industrial expansion and the increasing use of groundwater in Kendari City have heightened the risk of water table decline and seawater intrusion, particularly in areas adjacent to Kendari Bay. This study aims to assess and map the vulnerability to seawater intrusion in the Kendari Bay region using a modified GALDIT method, supported by field observations and hydrogeochemical analyses for validation. The results indicate that zones with very low to low vulnerability are predominantly located in the western part of the study area, which is characterized by higher topographic slopes. In contrast, areas with very high to high vulnerability are concentrated along the coastal zone, where elevations are relatively low and proximity to the shoreline increases exposure to seawater intrusion. Validation through field and chemical data confirmed the reliability of the vulnerability zoning, as wells situated in high-vulnerability zones consistently exhibited seawater intrusion signatures, whereas those in low-vulnerability zones showed typical freshwater characteristics.
Landslide Susceptibility Mapping Using Weight of Evidence Method in Tieng Village and Surrounding Areas, Kejajar District, Wonosobo Regency, Central Java Province, Indonesia Fenora Aninditya Pramesthi; Wahyu Wilopo; Agus Hendratno; Hendy Setiawan; I Gde Budi indrawan; Doni Prakasa Eka putra; Wahyu Sasongko
Journal of Applied Geology Vol 10, No 2 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.117696

Abstract

Tieng village and its surrounding areas in Kejajar District, Wonosobo Regency, are identified as regions with a relatively high risk of landslide hazards. This research aims to examine the geological conditions influencing landslide occurrences and to develop a landslide susceptibility zonation map within the study area. Methods of landslide mapping using statistical method weight of evidence (WoE), with parameters including slope, lithology and grade of weathering, distance from lineaments, distance from rivers, and land use. All parameters were classified into several class and spatially processed using ArcGIS software. Then, these maps were overlaid and analyzed based on contrast weight values to produce the final landslide susceptibility zonation map. The resulting susceptibility map categorized into four zones: very low, low, medium, and high landslide susceptibility. The very low landslide susceptibility zone is generally found in the eastern part of the area, the low susceptibility zone is in the western and eastern parts, the medium susceptibility zone occurs in the eastern and southern parts, while the high susceptibility zone is distributed in the southeastern, central, and eastern parts of the study area. The parameters that have the most influence on landslide susceptibility in the research area based on their level of influence from strongest to weakest are land use, distance from lineament, distance from river, lithology and grade of weathering and slope. The accuracy of the landslide susceptibility map was assessed using the Success Rate Curve (SRC) and Prediction Rate Curve (PRC) validation. The Area Under Curve (AUC) values obtained from the SRC and PRC analyses were 0.765 for SRC and 0.741 for PRC, respectively, indicating a good level of model performance.
Co-Authors Adelide Asriati Sekar Rianda Agung Harijoko Agung Setianto Agus Budhie Wiyatna Agus Hendratno Agus Hendratno Alih Janu Putra Alwan Satapona Arief Bandoro Sigit Atikah Zahidah Atmaja, Rilo Restu Surya Aung, Hnin Thazin Avantio Pramaditya Azmin Nuha Azwar Satry Muhammad Boreborey, Ty Boulom, Johnny Carlito Baltazar Tabelin Denizar Rahman Dessy Fitrianita Deviana Halim Doung Rata Dwikorita Karnawati Efendi Putra Dwijaya Pa Egy Erzagian Esa Pradindra Fassa Zaini Zam Zam Fandy Irvansyah Fenora Aninditya Pramesthi Firginawan Surya Wanda Fitria Majid Galeh Nur Indriatno Putra Pratama H Setiawan Harizona Aulia Rahman Haryono, Septiawan Nur Hazarika, Hemanta Hemanta Hazarika Hendy Setiawan Heng, Salpisey Hermawan, Oktanius Richard Heru Hendrayana Hirajima, Tsuyoshi Hnin Thazin Aung I Gde Budi Indrawan I Wayan Warmada Igarashi, Toshifumi Jaingot A. Parhusip Jaingot A. Parhusip, Jaingot A. Jinno, Kenji Johnny Boulom Juwarso Juwarso Juwarso, Juwarso K D Setyawan Kenji Jinno Keophousone Phonhalath Kurnianto Dwi Setyawan Kyu Kyu Mar Kyu Mar, Kyu Leakhena Snguon Lenggono, Tego Liliane Manny Listiyastuti, Riana Makealoun, Somyot Manixone Thepgnothy Manny, Liliane Maris Setyo Nugroho Mohammad Pramono Hadi Muhammad Iqbal Muhammad Iqbal Muhammad, Azwar Satry Nuha, Azmin Nurwijayanti Oktanius Richard Hermawan Phetnakhone Xaixongdeth Phonhalath, Keophousone Ponhalath Xaixongdeth R Risanti Rahman, Denizar Rahmat Satya Nugraha Rata, Doung Razi, Muhammad Haikal Restu Tandirerung Rilo Restu Surya Atmaja Rilo Restu Surya Atmaja Rilo Restu Surya Atmaja Rilo Restu Surya Atmaja Salpisey Heng Sandi Suko Widagdo Sarto Sarto Sarto Satapona, Alwan Sato, Tsutomo Sato, Tsutomu Saw Aung Zaw Aye Sekar Rianda, Adelide Asriati Septiawan Nur Haryono Shinta Dwi Novianti Simamora, Lestari Sutra Siti Suhartini S Napu Slamet Widodo Snguon, Leakhena Somyot Makealoun Soutsadachan Chandalsouk Souvannachith, Thilavanh Suryanto, Wiwit Susatio, Raja Syauqi, Syauqi T. Putranto, Thomas Tabelin, Carlito Baltazar Tee Xiong Tego Lenggono Teuku Faisal Fathani Teuku Faisal Fathani Thanh Thuy, Tran Thi Thepgnothy, Manixone Thilavanh Souvannachith Thomas T. Putranto Thomas Triadi Putranto Thomas Triadi Putranto, Thomas Triadi Toshifumi Igarashi Tran Thi Thanh Thuy Tsutomo Sato Tsutomu Sato Tsuyoshi Hirajima Tsuyoshi Hirajima Ty Boreborey Visi Asriningtyas Wahyu Sasongko Wahyu Wilopo Wawan Budianta Wibowo, Handoko Teguh Wisnu Rachmad Prihadi Wiyatna, Agus Budhie Xaixongdeth, Phetnakhone Xaixongdeth, Ponhalath Xiong, Tee Yosua Priambodo Zaw Aye, Saw Aung