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All Journal JFMR (Journal of Fisheries and Marine Research) Indonesian Physical Review Bima Abdi: Jurnal Pengabdian Masyarakat
Latumeten, Grimaldy Rooy
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Engineering Environmental Science Languange, Linguistic, Communication & Media Physics Other

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KAJIAN INTRUSI AIR LAUT DI PESISIR LATUHALAT, KECAMATAN NUSANIWE, KOTA AMBON: STUDY OF SEA WATER INTRUSION ON LATUHALAT COASTAL, NUSANIWE DISTRICT, AMBON CITY Latumeten, Grimaldy Rooy; Simon Tubalawony; Yunita A. Noya
JFMR (Journal of Fisheries and Marine Research) Vol. 7 No. 2 (2023): JFMR on August
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2023.007.02.2

Abstract

Salah satu permasalahan di wilayah pesisir yaitu intrusi air laut yang mempengaruhi kualitas airtanah di daratan. Kondisi ini sementara terjadi di Negeri Latuhalat, dimana masyarakat harus membeli air tawar untuk memenuhi kebutuhan air minum sehari-hari karena air sumur payau yang oleh penduduk setempat disebut salobar. Penelitian ini bertujuan untuk menganalisis tingkat salinitas air tanah dan luasan intrusi air laut di kawasan pesisir Latuhalat. Metode yang digunakan yaitu interpolasi spasial parameter fisika dan kimia serta analisis rasio klorida bikarbonat menggunakan software ArcGIS. Hasil penelitian  menunjukan kondisi pasang surut mengontrol konduktivitas air tanah dan distribusi klorida, dimana nilai konduktivitas dan klorida meningkat seiring dengan meningkatnya elevasi permukaan (pasang banjir). Nilai konduktivitas yang disurvei pada 14 sumur berkisar antara 446 μmhos/cm hingga 3236 μmhos/cm, sedangkan kandungan klorida berkisar antara 50 mg/L hingga 6631 mg/L. Analisis rasio klorida bikarbonat yang ditentukan oleh nilai Revelle Index (RI) mulai dari 0,017 hingga 2,321 menunjukan bahwa intrusi air laut terjadi dari tingkat rendah hingga menengah. Di area pesisir sepanjang 5 km, luasan wilayah yang tidak terintrusi adalah 3,18 km2 (63,6%). Sebaliknya intrusi rendah hingga menengah mencakup area sekitar 1,82 km2 (36,4%). Selain distribusi spasial konduktivitas dan klorida, konsentrasi yang cukup tinggi hanya diamati di Dusun Omputty, diinterpretasikan  pergerakan air laut ke daratan diakibatkan pasang surut air laut memperburuk kualitas airtanah.   One of the problems in coastal areas is seawater intrusion affecting the quality of groundwater on land. This is temporarily happening in Latuhalat Villages, where people need to buy fresh water to occupy their daily drinking water needs because of the brackish well water where locals called it salobar. This study aims to analyze the level of groundwater salinity and the magnitude of seawater intrusion in the Latuhalat coastal area. The method used is an interpolation of physical and chemical parameters and analysis of the bicarbonate chloride ratio using ArcGIS software. The results show that the tidal condition controls the groundwater chloride and conductivity distribution whereby the value of chloride and conductivity increased with the increasing surface elevation (flood tides). The conductivity value surveyed in the 14 wells ranged from 446 μmhos/cm to 3236 μmhos/cm, while the chloride content ranged from 50 mg/L to 6631 mg/L. The analysis of the bicarbonate chloride ratio determined by Revelle Index (RI) values ranging from 0.017 to 2.321 indicated that the seawater intrusion occurred from a low to moderate level. Within the coastal zone with an area of about 5 km, the non-intruded area was 3.18 km2 (63.6%). In contrast, the low-moderate intrusion covers an area of approximately 1.82 km2 (36.4%). In addition to the spatial distribution of conductivity and chloride, sufficiently high concentrations were only observed in Omputty Village. This state was due to the movement of seawater into land evoked by tidal regimes worsening groundwater quality.
NUMERICAL SIMULATION OF Mw 8.3 SOUTH BURU FAULT TSUNAMIS WITH 3D SLIP EVOLUTION IN AMBON Kelibulin, Josephus Ronny; Latumeten, Grimaldy Rooy; Elake, Alexander Yosep; Lebang, Annamaintin Kobong
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.541

Abstract

This study investigates the tsunami hazard potential induced by the activity of the South Buru Thrust Fault on the coastal areas of Ambon City through two-dimensional (2D) numerical modelling using the COMCOT v1.7 software, while incorporating three-dimensional (3D) slip evolution from the fault scenario. The earthquake scenario was set at Mw 8.3 based on fault length, width, and slip potential estimates, representing an extreme seismic event in the region. By integrating 3D slip evolution into the 2D tsunami model, the approach accounts for spatial variations in vertical displacement along the fault plane, directly influencing tsunami generation and propagation. The simulation results show significant spatial variations in tsunami run-up heights and inundation zones, with maximum run-up recorded at Kapahaha (13.08 m, arrival time ~832 s) and Slamet Riyadi Port (12.02 m, arrival time ~786 s). In comparison, minimum values occurred in Ambon's northern and northeastern parts (<1 m). The affected area and inundation distance from the shoreline also vary, e.g., Kapahaha (12,813 m², 159 m) and Slamet Riyadi Port (414,158 m², 1,213 m). Areas experiencing the highest tsunami inundation are Latuhalat (>5 m), followed by Galala–Wayame–Laha (3–5 m) and Paso–Rumah Tiga–Hative Kecil (2–4 m). The distribution of tsunami waves is influenced by coastal morphology, wave direction, and the presence of bays and capes, which can either amplify or block waves. Further analysis highlights the effects of seafloor topography, coastal morphology, and wave propagation pathways on run-up heights and arrival times. These findings underscore the importance of considering multi-segment rupture models, 3D deformation, and coastal morphology in tsunami hazard assessments and contribute to more realistic, source-specific mitigation strategies in tectonically complex regions such as Ambon.
Efektivitas Sosialisasi Mitigasi Bencana Gempa Bumi dan Tsunami di Wilayah Pesisir Latuhalat Kota Ambon Kelibulin, Josephus Ronny; Nanlohy, Pieldrie; Lebang, Annamaintin Kobong; Manuhutu, Ledy; Latumeten, Grimaldy Rooy
Bima Abdi: Jurnal Pengabdian Masyarakat Vol. 5 No. 3 (2025): Bima Abdi: Jurnal Pengabdian Masyarakat
Publisher : Yayasan Pendidikan Bima Berilmu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53299/bajpm.v5i3.2404

Abstract

Kegiatan pengabdian masyarakat ini bertujuan meningkatkan pengetahuan dan kesiapsiagaan warga pesisir Negeri Latuhalat, Kota Ambon, terhadap potensi gempa bumi dan tsunami. Metode pelaksanaan mencakup sosialisasi edukatif berbasis visual menggunakan video simulasi 3D, brosur, spanduk lokal, serta pre-test dan post-test. Masyarakat diperkenalkan pada potensi tsunami lokal akibat aktivitas sesar bawah laut, serta pentingnya evakuasi cepat melalui jalur aman yang telah dipetakan. Hasil evaluasi menunjukkan peningkatan pemahaman signifikan dari skor rata-rata 40,8% (pre-test) menjadi 86,1% (post-test), mencakup aspek pengetahuan dan sikap (K), rencana tanggap darurat (EP), peringatan dini (WS), dan mobilisasi sumber daya (RMC). Media edukatif yang dikembangkan terbukti efektif memperkuat pesan mitigasi dan menjangkau lebih banyak warga. Partisipasi aktif masyarakat menunjukkan antusiasme tinggi terhadap edukasi kebencanaan. Luaran kegiatan meliputi video edukatif, brosur, banner, peta rendaman tsunami hasil pemodelan numerik, serta peta evakuasi lokal yang dapat digunakan dalam program kesiapsiagaan lanjutan dan pelatihan kebencanaan di sekolah maupun masyarakat umum.
Co-Authors Elake, Alexander Yosep Kelibulin, Josephus Ronny Lebang, Annamaintin Kobong Manuhutu, Ledy Pieldrie Nanlohy Simon Tubalawony Yunita A. Noya