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All Journal JGE (Jurnal Geofisika Eksplorasi) Journal of Science and Applicative Technology JFMR (Journal of Fisheries and Marine Research) Jurnal Ilmu Fisika Jurnal Fisika : Fisika Sains dan Aplikasinya Jurnal AbdiMas Nusa Mandiri Jurnal Ilmiah Pengabdian dan Inovasi Jurnal Pengabdian Masyarakat dan Riset Pendidikan Jurnal Polimesin Jurnal Meteorologi dan Geofisika Journal of The Physical Society of Indonesia
Aminuddin, Jamrud
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Identifikasi Intrusi Air Laut Melalui Analisis Fisika-Kimia Air Tanah di Pesisir Selatan Cilacap, Jawa Tengah, Indonesia: Identification of Seawater Intrusion Through Physico-Chemical Analysis of Groundwater in the Southern Coast of Cilacap, Central Java, Indonesia Shokhib, Maskhiyatus; Irayani, Zaroh; Azmi, Ulil; Ardenti, Ekalia; Aminuddin, Jamrud
JFMR-Journal of Fisheries and Marine Research Vol. 10 No. 1 (2026): JFMR on March
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.2026.010.01.3

Abstract

Wilayah pesisir selatan Kabupaten Cilacap berbatasan langsung dengan lautan yang dapat mengakibatkan rentannya kondisi kualitas air tanah. Sumur gali dan sumur bor sebagai sumber air bersih bagi masyarakat berpotensi terdampak intrusi air laut. Intrusi air laut merupakan proses infiltrasi air asin ke dalam akuifer air tawar. Penelitian ini bertujuan untuk mendeteksi potensi intrusi air laut melalui pengukuran parameter fisika-kimia. Pengukuran parameter Total Dissolved Solids (TDS), daya hantar listrik (DHL), dan salinitas dilakukan pada 14 titik sampling yang tersebar di area studi. Data yang didapatkan dari survei lapangan kemudian dianalisis lebih lanjut regresi linear berganda. Hasil penelitian menunjukkan nilai TDS berkisar antara 99–1510 mg/L, dengan dua lokasi (SWI-09 dan SWI-14) menunjukkan nilai di atas 1000 mg/L. Nilai DHL bervariasi antara 199–3020 µS/cm, di mana dua lokasi yang sama memiliki nilai melebihi 1500 µS/cm. Meskipun demikian, sebagian besar sampel masih memenuhi standar air tawar berdasarkan kriteria PAHIAA (Panitia Ad Hoc Intrusi Air Asin) pada tahun 1986. Analisis regresi linear berganda mengungkapkan bahwa jarak dari pantai berpengaruh signifikan terhadap peningkatan DHL (p-value = 0,034), sedangkan kedalaman sumur tidak signifikan (p-value = 0,244). Hasil ini menunjukkan adanya indikasi awal intrusi air laut di lokasi yang sangat dekat dengan garis pantai, namun sebagian besar sumur masih layak digunakan karena masih dibawah nilai baku mutu (DHL <1.500 µS/cm, TDS <1.000 mg/L).   The southern coastal region of Cilacap Regency directly borders the ocean, which increases the vulnerability of groundwater quality. Dug wells and bore wells, which serve as clean water sources for local communities, are potentially affected by seawater intrusion. Seawater intrusion is the process of saline water infiltrating freshwater aquifers. This study aims to detect the potential for seawater intrusion through the measurement of physico-chemical parameters. Measurements of Total Dissolved Solids (TDS), electrical conductivity (EC), and salinity were conducted at 14 sampling points distributed across the study area. The data obtained from field surveys were further analyzed using multiple linear regression.The results show that TDS values range from 99 to 1510 mg/L, with two locations (SWI-09 and SWI-14) exceeding 1000 mg/L. EC values vary between 199 and 3020 µS/cm, where the same two locations recorded values above 1500 µS/cm. Nevertheless, most samples still meet the freshwater standards based on PAHIAA (1986) criteria. Multiple linear regression analysis reveals that the distance from the coastline significantly influences the increase in EC (p-value = 0.034), whereas well depth is not significant (p-value = 0.244). These findings indicate early signs of seawater intrusion in locations very close to the shoreline; however, most wells remain suitable for use as they are still below the threshold values (EC < 1500 µS/cm, TDS < 1000 mg/L).
Multiscale Atmospheric Drivers of the April 2023 Cilacap Flood: Insights from Himawari-9 RGB Imagery and Radiosonde Data Aminuddin, Jamrud; Susanti, Sri; Mardika, Adnan Dendy; Darmawan, Arief
Journal of the Physical Society of Indonesia Vol. 2 No. 1 (2026): April 2026
Publisher : The Physical Society of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35895/jpsi.2.1.25-33.2026

Abstract

This study analyzes the atmospheric drivers of extreme rainfall during the 27 April 2023 flood event in Cilacap, Indonesia, using satellite, reanalysis, and in situ data. Convective evolution was examined using rainfall records, Himawari-9 cloud-top temperatures, instability indices (CAPE, CIN, KI, TTI), and surface wind fields. Rainfall exceeded 135 mm from the afternoon to nighttime. Satellite observations showed rapid convective growth, with cloud-top temperatures dropping below −75 °C, indicating mature Cumulonimbus clouds. The 24-Hour Night Microphysics RGB imagery revealed convective initiation around 08:00 UTC and intensification during the evening. Atmospheric instability increased prior to the event, with CAPE exceeding 1600 J kg⁻¹ between 09:00 and 12:00 UTC, while CIN decreased below 80 J kg⁻¹. Surface wind analysis identified a strong low-level convergence zone formed by moist onshore flow from the Indian Ocean interacting with inland winds. This convergence provided dynamical lifting that released the stored instability, triggering deep convection that peaked around 15:00 UTC. The results show that the extreme rainfall was driven by the coupling of high thermodynamic instability and local moisture convergence, demonstrating the value of combining NWP products and satellite RGB imagery for diagnosing coastal extreme rainfall.
Co-Authors Agung Bambang Setio Utomo Almasah, Disty Nada Amir Yarkhasy Yuliardi Anggoro, Mochammad Donny Ardenti, Ekalia Arief Darmawan Aris Haryadi A’yun, Nidha Aulia Qurrata Bilalodin Bilalodin Budi Utomo, Agung Bambang Dari, Qorinah Wulan Evi Yulianti Fadhilah, Firda Haifa Gumelar, Syahrul Fadholi Haryandi, Reza Afrilia Putri Jayawarsa, A.A. Ketut Kartika Sari Kavadya Syska Khoryanton, Ampala Mardika, Adnan Dendy Mukhtar Effendi Mukhtar Effendi muwaffaq, Abiyyu Sayyid Noersomadi, Noersomadi Nurwijayanti Palutfi, Wardani Retno Paratessa, Alyah Praktino, Budi Rahmalia, Diah Ayu Ratri Andinisari Ropiudin . Rostaman Saputra, Dian Rizqi Shokhib, Maskhiyatus Shokib, Maskhiyatus Sri Susanti Sunardi Sunardi Sunardi Tampubolon, Danastri Lintang Pitaloka Vita, Tika Ayunda Warso Warso, Warso Wihantoro Zaroh Irayani