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Seawater intrusion assessment and prediction of sea-freshwater interface in Parangtritis coastal aquifer, South of Yogyakarta Special Province, Indonesia Wahyu Wilopo; R Risanti; Raja Susatio; Doni Prakasa Eka Putra
Journal of Degraded and Mining Lands Management Vol 8, No 3 (2021)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2021.083.2709

The Parangtritis area is a tourist destination in Yogyakarta, Indonesia, consisting of dunes and plains. One of the essential parameters in tourist areas is the provision of water sources. The increase in tourist visits and the development of tourism facilities in this area have increased groundwater utilization. Therefore, this study aims to assess the potential of seawater intrusion in the Parangtritis Beach area and its surroundings, Indonesia. The research was carried out by surveying, field measurements, and groundwater samples to test major ions in the laboratory. Indications of seawater intrusion are based on TDS values, Cl-, Simpson ratio, Sodium Chloride ratio, BEX, and groundwater type. The results showed that the research area had a shallow groundwater level with groundwater flow relative to the south-southwest and composed of unconfined aquifers. Only two water samples indicate seawater intrusion from Parangwedang spring and its southern place based on the geochemical analysis. However, this spring was formed due to geological structure related to geothermal manifestation and not due to seawater intrusion. It has a lateral flow to the south and is mixed with shallow groundwater, thereby increasing the chloride concentration in the groundwater. The sea-freshwater interface has a depth from 52 meters to 284 meters from sea level, where the farther from the coastline, the more profound.

Aquifer distribution and groundwater geochemistry in Bojonegoro Sub-district, Bojonegoro District, East Java Province, Indonesia Wahyu Wilopo; Doni Prakasa Eka Putra; Raja Susatio
Journal of Degraded and Mining Lands Management Vol 7, No 4 (2020)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2020.074.2327

Bojonegoro Sub-district is the capital of Bojonegoro District, East Java Province, Indonesia. This area has quite high economic growth supported by large oil and gas reserves in the district. An increasing number of population and improving economy will cause more water needs. People in this area use groundwater as their main source for daily purposes. However, information on the potential of groundwater resources is not yet well available. Therefore, the study aims to determine groundwater flow patterns, the distribution of aquifers, and groundwater geochemistry. The study was conducted by measuring groundwater level as many as 42 points; both dug wells and deep wells, 18 points geo-electrical surveys, and chemical analysis of eight groundwater samples. The results showed groundwater flow direction into the Bengawan Solo River with the primary aquifer of the sandstone lens. All groundwater samples indicate that the type of groundwater is calcium magnesium bicarbonate (Ca2+ - Mg2+ - HCO3-) and come from one system. High nitrate content was found in some areas, probably due to contamination from agricultural or urban wastewater. Therefore, it needs some actions for groundwater protection and conservation in this area to support the sustainable use of groundwater.

ANALISIS MULTI KRITERIA SPASIAL UNTUK EVALUASI RENCANA PENGEMBANGAN PERUMAHAN DI GODEAN, YOGYAKARTA Doni Prakasa Eka Putra; Rilo Restu Surya Atmaja; Kurnianto Dwi Setyawan; Raja Susatio
Jurnal Pengembangan Kota Vol 8, No 2: Desember 2020
Publisher : Diponegoro University

Kebutuhan perumahan di daerah perkotaan semakin tinggi, tidak sebanding dengan ketersediaan lahan untuk perumahan. Upaya pembukaan lahan yang murah tersedia pada daerah bentang alam ekstrim seperti perbukitan, seperti di Godean, Yogyakarta, yang memiliki potensi bahaya gerakan massa. Kajian ini bertujuan untuk memetakan zona bahaya gerakan massa dan mengevaluasi keamanan site-plan perumahan. Metodologi peneltian berupa pemetaan aspek geologi teknik yaitu kelerengan, kekuatan batuan, dan densitas struktur geologi yang kemudian diolah dengan metode overlay pada perangkat lunak Sistem Informasi Geografis. Aplikasi analisis multi kriteria (AMK) spasial menghasilkan zonasi kerentanan/potensi bahaya gerakan massa detil di lokasi penelitian, dimana zona ekstrim bahaya gerakan massa berasosisasi dengan lereng yang curam-terjal, kekuatan batuan lemah dan densitas struktur geologi yang rapat-sangat rapat. Penampalan peta bahaya tersebut dengan site-plan memungkinkan perencana dan pemangku kepentingan melakukan perencanaan ulang pada beberapa blok perumahan untuk memastikan pengembangan perumahan yang aman.

Identifikasi Intrusi Air Laut pada Akuifer Pantai Menganti, Kecamatan Kesugihan, Cilacap, Jawa Tengah Doni P. E. Putra; Fania An Nisaa; Raja Susatio; Rilo Restu Surya Atmaja
Jurnal Ilmu Lingkungan Vol 21, No 3 (2023): July 2023
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.21.3.545-552

Pantai Menganti di Kecamatan Kesugihan, Kabupaten Cilacap, Jawa Tengah, merupakan salah satu pantai di pesisir selatan Jawa. Air tanah berada pada akuifer pasiran dengan kedalaman sangat dangkal (1-2 m) dari permukaan tanah. Tataguna lahan yang berkembang adalah pemukiman, perkebunan, persawahan, tambak, dan pembangkit listrik tenaga uap (PLTU). Penelitian bertujuan mengidentifikasi intrusi air laut pada akuifer di Pantai Menganti menurut karakteristik fisika-kimia dan kadar ion klorida serta keterkaitannya dengan tataguna lahan. Pengukuran dan pengambilan sampel air tanah dilakukan dengan metode random sampling pada tataguna lahan yang berbeda. Pengukuran karakteristik fisika dan kimia air tanah yaitu pH, daya hantar listrik (DHL), total dissolved solid (TDS) dilakukan langsung di lapangan sedangkan analisis kadar ion klorida di laboratorium. Penelitian menunjukkan air tanah alami secara umum memiliki karakteristik pH relatif normal, DHL < 1500 µS/cm, TDS < 1000 mg/L, dan kadar ion klorida < 35 mg/L. Terdapat anomali nilai DHL, TDS, dan Kadar ion klorida yang mengindikasikan intrusi air asin khususnya di pesisir bagian timur. Area air tanah yang terpengaruh intrusi air laut diperkirakan sekitar 500 m dari garis pantai serta umumnya berasosiasi dengan pemukiman, tambak, dan PLTU

Analisis Potensi Longsor Menggunakan Metode Analytical Hierarchy Process pada Kecamatan Panekan, Kabupaten Magetan Susatio, Raja; Arrisaldi, Thema; Erzagian, Egy; Hanifi Mada Mahendra, Fathan
Jurnal Ilmiah MTG Vol 15 No 1 (2025): Jurnal Ilmiah MTG Volume 15 No.1 Tahun 2025
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

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Panekan Sub-district, Magetan Regency, is located on landslide prone area. To address this issue, a landslide susceptibility map is needed. This study aims to develop landslide susceptibility map for Panekan Sub-district using Analytical Hierarchy Process (AHP). AHP method was used to determine the weights and relative influence of five parameters which is slope, lithology, distance from structures, distance from rivers, and land use. The weight scores for each parameter are as follows: slope gradient (0,403), lithology (0,318), distance from structures (0,139), distance from rivers (0,084), and land use (0,056). Each parameter was analyzed spatially using Geographic Information System (GIS). AHP analysis produced map with values ranging from 0,99 to 4,31. Zonation was classified using the index method based on Regulation of Head of BNPB No. 2 of 2012. AHP analysis found that most areas of Panekan Sub-district are within medium hazard zone. These findings are expected to serve as a basis for local governments and communities to strengthen disaster mitigation and preparedness efforts.

Pengembangan Wisata Embung Berbasis Mitigasi Bencana pada Embung Setumpeng Desa Gentungan, Mojogedang, Karanganyar Susatio, Raja; Matin, Hashfi Hawali Abdul; Rachmawati, Siti; Setyono , Prabang; Sunarhadi, Muhammad Amin; Kusumaningrum, Lia
Jurnal Ilmiah MTG Vol 15 No 1 (2025): Jurnal Ilmiah MTG Volume 15 No.1 Tahun 2025
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

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Setumpeng Reservoir in Gentungan Village, Mojogedang Subdistrict, Karanganyar Regency was a lively tourism spot. Unfortunately, Covid-19 pandemic made the tourism activity in this area to cease indefinitely. As the tourism activity ceased, the reservoir became neglected. In the near future, Gentungan Village plans to redevelop Setumpeng Reservoir as tourist spot once again. Nevertheless, the possibility of disaster in the area pushes the necessities of planning based on disaster mitigation and reduction. This study aims to create a hazard map to support the sustainable development of Setumpeng Reservoir tourism spot. The method used in this research are field survey to identify potential hazard in the area directly. Hazard that was found in Setumpeng Reservoir area reservoir failure and landslides. Area with high hazard zone is located in downstream of reservoir as this area would face the direct impact of reservoir failures. Area with medium hazard zone can be found in the south of the reservoir that only face small scale landslides. The last area of low hazard zone located in the north of the reservoir as it doesn’t face neither reservoir failure nor landslides. Yet even the area is relatively safe, further study is necessary as it’s a paddy field. A study regarding foundation and building stability is a must.

Improving Landslide Susceptibility Using Groundwater Parameter in Samigaluh and Kalibawang Subdistricts Susatio, Raja; Sartohadi, Junun; Samodra, Guruh; Setiawan, Muhammad Anggri; Wilopo, Wahyu
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.106054

Landslide susceptibility map is crucial in disaster risk management and it can be used for regional development plans. Landslide susceptibility map can be made by analyzing parameters that are assumed to affect landslides such as gradient slopes, geology, soil, and climate. Selection of landslide controlling parameters influences the accuracy of landslide susceptibility map. This study evaluates the effect of parameter that’s rarely used which is groundwater. The study area of this research was Kalibawang and Samigaluh Subdistricts, Kulonprogo, Special Region of Yogyakarta, Indonesia. Frequency ratio was used for the method along other parameters which is slope gradient, lithology, lineament density, land use, soil thickness. The result shows that groundwater parameter increase the accuracy by 22,29%. This study suggest that groundwater should be highly considered in landslide susceptibility mapping. In the other hand, groundwater depth mapping remains a challenge because most remote sensing method only detect shallow groundwater. Further research is necessary to develop better method for groundwater mapping using remote sensing or other indirect method.

Non-Linear Lineament Density Impacts on Groundwater Infrastructure for Drought Resilience in Kulon Progo, Indonesia Susatio, Raja; Arrisaldi, Thema; Aprilia, Faridha; Manek, Emanuel Grace; Wilopo, Wahyu
Dinamika Teknik Sipil: Majalah Ilmiah Teknik Sipil Vol. 18/No. 2/Desember 2025
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/dts.vi.13704

Drought poses a significant threat to water supply in regions like Kulon Progo, Indonesia. Seasonal water shortages lead to agricultural losses and increased disaster vulnerability. This study aims to improve groundwater exploration method for drought mitigation by analyzing the correlation between lineament density and groundwater using a dataset of 127 observations from Samigaluh and Kalibawang subdistricts using Pearson Correlation. The research uncovers a non-linear threshold at 4 km/km². Below the threshold, groundwater occurrence increases with density (r = 0.949), shows increasing infiltration. But above the threshold, occurrence decreases (r = -1.000), suggesting over-fracturing reduces storability. Maximum depths follow a similar pattern (r = 0.883 below, r = -1.000 above). These findings challenge conventional scoring methods in groundwater potential zoning, which often assume a linear positive relationship with lineament density. The study provides a novel framework for targeted exploration, prioritizing moderate-density zones to mitigate drought impacts and build resilience against climate-induced disasters.

Improving Landslide Susceptibility Using Groundwater Parameter in Samigaluh and Kalibawang Subdistricts Susatio, Raja; Sartohadi, Junun; Samodra, Guruh; Setiawan, Muhammad Anggri; Wilopo, Wahyu
Journal of Applied Geology Vol 10, No 1 (2025)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jag.106054

Landslide susceptibility map is crucial in disaster risk management and it can be used for regional development plans. Landslide susceptibility map can be made by analyzing parameters that are assumed to affect landslides such as gradient slopes, geology, soil, and climate. Selection of landslide controlling parameters influences the accuracy of landslide susceptibility map. This study evaluates the effect of parameter that’s rarely used which is groundwater. The study area of this research was Kalibawang and Samigaluh Subdistricts, Kulonprogo, Special Region of Yogyakarta, Indonesia. Frequency ratio was used for the method along other parameters which is slope gradient, lithology, lineament density, land use, soil thickness. The result shows that groundwater parameter increase the accuracy by 22,29%. This study suggest that groundwater should be highly considered in landslide susceptibility mapping. In the other hand, groundwater depth mapping remains a challenge because most remote sensing method only detect shallow groundwater. Further research is necessary to develop better method for groundwater mapping using remote sensing or other indirect method.

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