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All Journal Indonesian Journal of Geography TEKNIK Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards)
Hidayatillah, Ahmad Syauqi
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Engineering Environmental Science Physics

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Groundwater Potency Analysis Using Remote Sensing and Analytical Hierarchy Process To Overcome Drought In Rembang Regency, Indonesia Putranto, Thomas Triadi; Mustiono, Ady Rieo Wahyu; Hidayatillah, Ahmad Syauqi
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.77889

Abstract

Water is an indispensable need for all living beings, including humans, who require this vital resource for consumption, bathing, and agricultural irrigation. One of the sources of clean water is groundwater, which meets 80% of the drinking needs. However, only 82.1% of the population in Central Java has access to clean water, while the remaining 17.9% have limited accessibility. This condition was caused by the prevalence of droughts, particularly in Rembang Regency, indicating that several efforts are needed to overcome this problem. Therefore, this study aims to analyze the groundwater potential in Rembang Regency using remote sensing and Analytical Hierarchy Process (AHP) methods. The remote sensing technique was used to determine the lithology, hydrogeology, lineament density, slope, rainfall, vegetation cover, and land use of the area, while the AHP method was utilized to assess groundwater potential. The results showed that the hydrogeology parameter had the greatest influence with a weight of 21.8%, followed by lithology (15.8%), rainfall (15.1%), vegetation cover (13.5%), land use (10.9%), lineament density (14%), and slope (9.4%). These findings were then validated with existing points of interest, including dug wells, deep wells, and reservoirs. The analysis results showed that the study area can be divided into 4 zones based on the groundwater potential, namely very low (1.2 – 2.24), low (2.24 – 3.48), moderate (3.48 – 4.72), and high (4.72 – 5.96) with areas of 0.19 km2, 234.8 km2,173.4 km2, and 51.9 km2, respectively. Furthermore, based on the validation, 90 out of 108 (83%) interest points were in line with the groundwater potential map zones.
Identifying Dominant Structural Pattern of Semarang City Using Digital Elevation Model and Landsat 8-OLI Imagery Hidayatillah, Ahmad Syauqi; Nurcahyo, Tri Apri; Muliawan, Jody Bintara Pradiksa; Endarsih, Alfyah Edina
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 1 (2024): JGEET Vol 09 No 01 : March (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.1.12706

Abstract

Semarang City is an area in the northern part of Java Island, administratively the Capital of Central Java Province. Because Semarang City is the provincial capital, Semarang City has a relatively dense population. Geologically, the city of Semarang is an area that consists of various types of lithology and is traversed by various regional geological structures. In this case, understanding the existence and distribution of geological structures in the city of Semarang is essential, considering that geological structures are one of the controllers for natural disasters such as landslides and earthquakes. This study analyzed the existence and distribution of geological structures in the city of Semarang based on the lineaments observed from digital elevation models and satellite imagery. This study aims to identify the dominant structural pattern in Semarang City, determine the relationship between fault fracture density (FFD) with regional geological structure and lithology, and determine the fault zone area in Semarang City based on FFD & lineament analysis. The method used in this analysis is to process DEM data and Landsat 8-OLI imagery, then interpret the lineaments in the form of rosset diagrams and the density in the form of FFD maps. The results of the rosset diagram analysis show that Semarang City has various structural lineament patterns, namely: North–South, Northeast–Southwest, and Northwest–Southeast, with the North–South pattern as the dominant pattern. Based on the results of the lineament density distribution on the FFD map, it is known that the area traversed by the Semarang regional geological structure has a high lineament density value which is interpreted that the area is a weak zone with high structural intensity. From this study, it can also be seen that there is no significant relationship between the type of lithology and the density value on the FFD map. The distribution of lineament density is not affected by the type of lithology, except in the northern and northeastern parts of Semarang city, which consist of alluvium. Based on these results, it can be interpreted that the fault zone area is associated with areas that have high-density values on the FFD map. Distribution of the fault zone area of Semarang City is spreading over the Banyumanik, Gunungpati, and Mijen Districts, which are relatively in the southern and central parts of Semarang City.
Analisis Keruntuhan Lereng dengan Metode Structure from Motion (SfM) pada Lereng Tambang Batugamping di Tuban, Jawa Timur Susanto, Akbar; Najib, Najib; Hidayatillah, Ahmad Syauqi; Novianto, Hendi; Aryati, Farida; Palumpun, Valentinus Alan Wibisono
Jurnal Lingkungan dan Bencana Geologi Vol 14, No 2 (2023)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v14i2.485

Abstract

Kegiatan penambangan pada tambang terbuka memiliki dinamika perubahan geometri lereng yang berbeda seiring dengan laju kegiatan penambangan. Dinamika lereng tersebut perlu dilakukan penyelidikan dalam geologi teknik seperti melalui analisis kinematika lereng berdasarkan kedudukan diskontinuitas hasil scanline dengan menggunakan kompas geologi. Akan tetapi, penyelidikan tersebut dapat diganti menggunakan metode seperti metode Structure from Motion (SfM). Metode SfM mempunyai kelebihan dalam melakukan penyelidikan secara efektif, menjangkau area yang tinggi dan berbahaya. Dalam metode SfM, bentukan lereng divisualisasikan menjadi model 3D sesuai dengan kondisi aktual sehingga dapat diekstraksi kedudukan diskontinuitas yang dimiliki suatu lereng. Data penyelidikan metode SfM diambil melalui foto udara menggunakan drone quadcopter DJI Phantom Pro V.2. Selanjutnya data tersebut diolah menjadi dense point cloud melalui Agisoft Metashape Pro agar dapat dilakukan ekstraksi bidang diskontinuitas. Ekstraksi bidang diskontinuitas dilakukan dengan aplikasi Cloud Compare dan Discontinuity Sets Extractor (DSE). Penggunaan aplikasi ini dilakukan untuk mengetahui bagaimana perbandingan hasil analisis kinematika lerengnya. Berdasarkan hasil kinematika dari dua ekstraksi data diskontinuitas yang berbeda, pada kinematika lereng untuk ekstraksi data melalui Cloud Compare ditemukan hasil tipe keruntuhan guling dengan signifikansi 28,57 %, dan untuk hasil dari ekstraksi data melalui DSE didapatkan hasil bahwa lereng tidak memiliki kecenderungan untuk terjadinya keruntuhan. Hasil analisis kinematika yang diberikan pada pengolahan data dari hasil ekstraksi diskontinuitas pada aplikasi DSE menunjukkan hasil yang masih meragukan karena memiliki kecenderungan error pada saat dilakukan komputasi secara otomatis. Hal ini berbeda dengan hasil dari ekstraksi data pada aplikasi Cloud Compare karena ektraksi data diskontinuitas dilakukan dengan manual oleh pengamat. Pemanfaatan metode SfM memberikan kemudahan dan keefektifan dalam mengambilan data diskontinuitas untuk analisis data kestabilan lereng. 
Coal Mine Slope Stability Analysis Using the Rock Mass Rating (RMR), Slope Mass Rating (SMR) Method, and Morgenstren-Price Limit Equilibrium for the Low Wall Pit Area Y PT. Bina Sarana Sukses, Lahat Regency, South Sumatra Najib, Najib; Belia, Nanda Putri; Hidayatillah, Ahmad Syauqi; Nugroho, Kevin Setyo Adi
TEKNIK Vol 45, No 2 (2024): August 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i2.57786

Abstract

Open pit mining has a complex connection to excavation and stockpiling operations, which can potentially induce slope instability. The analysis of slope stability is crucial to prevent slope failure, which has the potential to result in major losses. The study on slope stability was performed at the low wall pit Y area of PT. Bina Sarana Sukses site MAS in Lahat Regency. This research aimed to analyze the rock mass classifications, determine the safety factor values, and provide recommendations for mitigating landslide occurrences. The techniques employed in this study include the RMR and SMR methods for assessing the susceptibility of landslides, collectively with the Morgenstern-price limit equilibrium approach for estimating the stability of the slope. Based on the analysis of the rock mass rating (RMR) and slope mass rating (SMR), Block B2 exhibits a 20% likelihood of experiencing landslides, specifically due to block joint characteristics. On the other hand, Blocks B4 and B5 show a 40% potential for landslides, primarily associated with flat or wedge-type block joints. The force produced by friction under saturated conditions is comparatively lower than that observed under dry conditions. During the final design phase in 2022, it was observed that Blocks B4 and B5 exhibit critical and dangerous safety factors when saturated. Hence, the proposal has been suggested to enhance slope stability. Further, it is recommended to monitor the geotechnical piles periodically. We hope this research results as a valuable resource for evaluating and assessing slope stability, including artificial and natural slopes.
Isotope Analysis of 18O and 2H: A Coastal Confined Aquifer Case Study Nugraheni, Vania Salsabila Anabel; Santi, Narulita; Putranto, Thomas Triadi; Marin, Jenian; Hidayatillah, Ahmad Syauqi
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 22, No 3 (2025): November 2025
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/presipitasi.v22i3.909-921

Abstract

In 2023, groundwater quality in Semarang declined due to excessive extraction, leading to land subsidence and reduced groundwater availability. Prolonged dry seasons caused drought in ten villages across five sub-districts. This study aims to investigate geological conditions, groundwater flow patterns, and the spatial distribution of pH, TDS, hardness, electrical conductivity, and major ions (Na⁺, Ca²⁺, Cl⁻, and HCO₃⁻). Additionally, it seeks to interpret groundwater evolution through Gibbs diagram analysis and identify groundwater origins using stable isotopes (¹⁸O and ²H). The methodology involves stable isotope analysis to trace groundwater sources and evaluate d-excess values, which are linked to drought conditions and recharge mechanisms. Water chemistry analysis was performed to characterize ion concentrations, while the Gibbs diagram was used to identify the dominant geochemical processes influencing groundwater. The study area comprises claystone, marl, sandstone, volcanic breccia, and alluvium, with 60 sampling points spanning Upper and Lower Semarang. Water types identified include NaHCO₃, NaCl, CaHCO₃, MgHCO₃, and NaSO₄. NaHCO₃ was the most common, followed by NaCl and CaHCO₃. Isotope analysis revealed several points with d-excess <10 (e.g., SB-10L, SB-20L, SA-4, SA-8, SA-29), indicating groundwater recharge from modern rainfall, typically characterized by d-excess values >10. 
Co-Authors Aryati, Farida Belia, Nanda Putri Endarsih, Alfyah Edina Marin, Jenian Muliawan, Jody Bintara Pradiksa Mustiono, Ady Rieo Wahyu Najib Najib Novianto, Hendi Nugraheni, Vania Salsabila Anabel Nugroho, Kevin Setyo Adi Nurcahyo, Tri Apri Palumpun, Valentinus Alan Wibisono Santi, Narulita Susanto, Akbar Thomas Triadi Putranto, Thomas Triadi