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Journal : Geosfera Indonesia

Assessment of Flood Hazard Mapping Based on Analytical Hierarchy Process (AHP) and GIS: Application in Kencong District, Jember Regency, Indonesia Muhammad Asyroful Mujib; Bejo Apriyanto; Fahmi Arif Kurnianto; Fahrudi Ahwan Ikhsan; Elan Artono Nurdin; Era Iswara Pangastuti; Sri Astutik
Geosfera Indonesia Vol. 6 No. 3 (2021): GEOSFERA INDONESIA
Publisher : Department of Geography Education, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v6i3.21668

Abstract

Flood is one of the most frequent hydrometeorological disasters which leads in economic losses. The first step in flood disaster mitigation efforts is mapping vulnerable areas. Kencong District frequently affected by the annual flooding event. This study aims to assess flood hazard mapping by integrating the AHP method and Geographic Information System. This study used a descriptive quantitative approach through the correlation matrix of the AHP model for each physical environmental factor. These factors include slope, altitude, distance from the river, soil type, Topographic Wetness Index (TWI), and Curvature. Furthermore, with the Geographic Information System (GIS), the weighted overlay stage was carried out to obtain the results of flood-prone areas. Based on the AHP analysis, the most significant factors in determining flood-prone areas were the distance from rivers, slopes, and TWI. The results of flood-prone areas mapping were divided into five classes: from deficient 0.02%, low 4.26%, medium 37.11%, high 51.89%, and very high 6.72%. Validation of GIS mapping results with data in the field has an AUC value of 84%, which indicates that the prediction of the AHP-GIS model is perfect in flood-prone areas mapping in the Kencong District. The integration of AHP method and Geographic Information System in flood hazard assessment were able to produce a model to evaluate the spatial distribution of flood-prone areas. Keywords : Flood Hazard Mapping; Multi-criteria decision analysis; AHP Model; GIS; Jember Copyright (c) 2021 Geosfera Indonesia and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License
Analysis of the Spatial Distribution of Seawater Intrusion Using a Hydrogeochemical Approach: A Study of the Coastal Geology of Kebumen Regency, Indonesia Faidatuz Zahroh; Muhammad Asyroful Mujib; Sri Astutik; Bejo Apriyanto; Era Iswara Pangastuti
Geosfera Indonesia Vol. 9 No. 2 (2024): GEOSFERA INDONESIA
Publisher : Department of Geography Education, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v9i2.34885

Abstract

This study examines seawater intrusion in the southern part of Kebumen District, focusing on the impact of various geological formations on groundwater salinity. Groundwater samples were systematically collected from 11 locations representing alluvial, volcanic, coastal sediment, and karst geological conditions. The samples were analyzed for major ions, including calcium (Ca²⁺), magnesium (Mg²⁺), chloride (Cl-), and bicarbonate (HCO₃-), as well as Total Dissolved Solids (TDS). Ion ratios such as Mg²⁺/Ca²⁺, Cl⁻/HCO₃⁻, and Mg²⁺/(Mg²⁺+Ca²⁺), along with the Fraction of Seawater (fsea), were calculated to assess the extent of seawater intrusion. The study employed the Gibbs diagram method to identify the primary processes controlling groundwater chemistry, revealing that water-rock interactions are dominant in most samples, particularly in those affected by seawater intrusion. The results indicate significant seawater intrusion in alluvial and karst regions, especially at sampling points TP 2, TP 4, and TP 10, while volcanic and coastal sediment areas show minimal intrusion. These findings underscore the critical influence of geological conditions on seawater intrusion and highlight the need for targeted groundwater management strategies. Further research focusing on long-term monitoring is recommended to better understand and mitigate the impacts of seawater intrusion in this region.
Co-Authors Agum Taufan Agus Santoso Agustin, Herviona Ahmad Farhan Alfani Ahmad Farhan Alfani Al Musafiri, M. Rizqon Aldo Mahendra Putra Amalia, Cindy Nurul Amrullah, Muhammad Jiddan Ana Susiati Ana Susiati Ana Susiati Ana Susiati, Ana Anik Nur Khasanah Aprilia Wulan Iza Tul'ulum Apriyanto, Bejo Ardiansyah, Moch. Ali Riski Asmi, Nadiyah Annisa Tsabitul Avindi Dewi Salsabilla Ayu Walidatul Rahman Azizah, Nuril Bejo Apriyanto Bejo Apriyanto Bejo Apriyanto Bejo Apriyanto Binti Rosyida Chachan Gusti Rawa Chistella, Chalia Dea, Anak Agung Istri Sinta Diana Fatmawati Diartika, Firda Ega Bintang Prayoga Eko Haryono Elan Artono Nurdin Elan Artono Nurdin Elan Artono Nurdin Era Iswara Pangastuti Era Iswara Pangastuti Era Iswara Pangastuti Eva Banowati Eva Kurniasari Fahmi Arif Kurnianto Fahmi Arif Kurnianto Fahmi Arif Kurnianto Fahrudi Ahwan Ikhsan Fahrudi Akhwan Ikhsan Faidatuz Zahroh Fatchurohman, Hendy Fauzan, Zumrotus Sholihah Fitra, Audina Anugra Fitrady Wicaksana Gilang Dwi Prakoso Hablana Rizka Hanifah Mahat Hoday Ifa Indartin, Tri Rafika Diyah Iya’ Setyasih Izzulhaq Aqnul Wijaya Jefri Rieski Triyanto Kheysa Dwinanda Agustina Khodijjah, Ida Kurnianto, Fahmi Arif Kusumaningayu, Arini Dwi Lia Puspita Wahyuningrat Lukman Hakim Luqmanul Hakim M. Shodrusyahid Khusamuddin Miftachurroifah Miftachurroifah Moch. Shofwan Mohamad Ryan Ajie Baskara Muhammad Naufal, Muhammad Muhammad Zaid Nuriyanto Muhammad, Ikhlas Nur Mulyanie, Erni Nimas Puspo Retno NUGROHO HARI PURNOMO Nurdika, Shanti Pamuji, Riski Indah Pangastuti, Era Iswara Prakastiwi, Dianti Pramesty, Dinda Ayu Pratiwi, Ilmia Putra, Bagus Sukma Pradana Rakhmawati Oktasenta Syafira Rakhmawati Oktasenta Syafira Retna Ngesti Sedyati, Retna Ngesti Riski Indah Pamuji Rohman, Abdu S Sukidin Saliman Saliman Sara, Emman Yoga Satwika Santa Widya Sista Sedyati, Retna Ngesti Sedyati Setyawan Triaditama Siti Lailil Maghfiroh Sri Astutik Sri Astutik SRI ASTUTIK Sri Astutik Sri Astutik Sri Astutik Sri Astutik Sri Astutik Sri Astutik Sri Kantun Sri Kantun Syafitri, Anggi Wahyu Tania Rahmanizah Taufiq Hidayatul Warid Tiara Tiara, Tiara Tjahyo Nugroho Adji Vika Aurely Nalurita Wahyu Gerhana, Sony Eka Wibowo, Waskito Kukuh Widayani, Anna Y. Yushardi Yanto, Bejo Apri Yunta, Bima Delas Yushardi Yushardi Yushardi Yushardi, Yushardi