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All Journal Geosains Kutai Basin Journal of Marine Resources and Coastal Management BULETIN FISIKA
Avrionesti
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics

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Simulation of sea breeze events during the 2024 dry season along the Cilacap coastline, Indonesia, using the WRF model with satellite data assimilation Arzhida, Bima; Haryanto, Yosafat Doni; Avrionesti; Sabrina , Purwanti Lelly
Journal of Marine Resources and Coastal Management Vol. 7 No. 2 (2026)
Publisher : UIN Sunan Ampel Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29080/mrcm.v7i2.2617

Abstract

Sea breeze is a coastal meteorological circulation driven by the thermal contrast between land and adjacent water. This study identified and simulated selected sea-breeze events over the Cilacap coastal region during the dry season (May–August 2024). A modified objective filtering procedure was applied using wind speed, wind direction, a positive land–coastal surface air temperature difference, flow persistence, and precipitation. Two events were selected, occurring on 14 May and 24 August 2024. These events were simulated using the Weather Research and Forecasting–Advanced Research WRF model with three-dimensional variational assimilation of Himawari-9 infrared radiance data. The horizontal fields showed that onshore flow began to develop at approximately 11:00 LT and became most continuous around 13:00 LT. On 14 May, the circulation weakened by approximately 17:00 LT, whereas on 24 August it remained identifiable until approximately 19:00 LT. Statistical evaluation against automatic weather station (AWS) observations yielded wind-speed correlation coefficients of 0.534 and 0.923, with root mean square error (RMSE) values of 1.196 and 0.851 m/s for 14 May and 24 August, respectively. Wind-rose comparisons showed generally consistent onshore directional patterns, although differences remained in directional frequency and wind-speed classes. Because no unassimilated WRF control experiment was conducted, the verification assesses only the agreement between the WRF Data Assimilation (WRFDA) simulation and AWS observations and does not quantify the added value of Himawari-9 data assimilation.
Simulation of Storm Surge Generated by Tropical Cyclone Senyar in the Strait of Malacca Using the ADCIRC Model Amanu, Rendy Syahril; Sabrina, Purwanti Lelly; Avrionesti; Amri, Sayful
GEOSAINS KUTAI BASIN Vol. 9 No. 2 (2026)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/561wve82

Abstract

Tropical Cyclone (TC) Senyar, which formed over the Strait of Malacca in late November 2025, represents a relatively rare meteorological phenomenon in the near-equatorial region. Its strong wind field and low central pressure had the potential to generate a rise in sea level (storm surge) along the northern coast of Sumatra. This study aims to quantify the storm surge contribution associated with TC Senyar using the Advanced Circulation (ADCIRC) hydrodynamic model over a domain spanning 95–105°E and 0–8°N. Simulations were conducted from 22 November to 2 December 2025, incorporating a two-day ramp-up period to gradually increase the meteorological forcing. Two scenarios were simulated: the total sea level, influenced by tides, wind, and atmospheric pressure; and the tidal sea level, influenced solely by tidal boundary conditions. The unstructured computational mesh was generated using OceanMesh2D at a resolution of 2.5–50km, based on GEBCO 2025 bathymetry and GSHHS coastline data. Meteorological forcing (wind and atmospheric pressure) was obtained from ERA5, while tidal boundary conditions were derived from TPXO10. Storm surge was computed using the residual method, in which the tidal sea level was subtracted from the total sea level, and was analyzed at four stations: Lhokseumawe, Idi Rayeuk, Belawan, and Kuala Tanjung. The results show maximum residual storm surge values of 0.06 m, 0.12 m, 0.18 m, and 0.17m, respectively, with peaks occurring between 25 and 27 November 2025. The largest storm surge amplification, exceeding 0.25m, occurred along the coast of the Malay Peninsula and the southern part of the Strait of Malacca.
Analysis of Integrated Vapor Transport and Atmospheric Dynamics During the Extreme Rainfall Event in Tangerang City (Case Study: January 28-29, 2025) Muhammad Fathurrachman Alghazali; Latifah Nurul Qomariyatuzzamzami; Yosafat Donni Haryanto; Avrionesti
BULETIN FISIKA Vol. 28 No. 1 (2027): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2027.v28.i01.p05

Abstract

The extreme rainfall event in Tangerang City on 28 - 29 January 2025 caused flooding in several areas and disrupted flight activities at Soekarno-Hatta International Airport. This study aimed to analyze integrated vapor transport and atmospheric dynamics associated with the extreme rainfall event. The method used was descriptive quantitative research with a case study approach. The data consisted of three-hourly rainfall data from Soekarno-Hatta Meteorological Station and ERA5 ECMWF reanalysis data, including wind components, relative humidity, divergence, vorticity, vertical velocity, and water vapor transport at the 1000–300 mb layer. This study also analyzes atmospheric stability indices derived from Soekarno-Hatta radiosonde data, including the K-Index (KI), Lifted Index (LI), Showalter Index (SI), Total Totals Index (TT), CAPE, and SWEAT. The results showed that atmospheric conditions during the event were characterized by the strengthening of westerly to northwesterly winds at the 925 mb layer, high relative humidity of 80–100% in the lower to middle troposphere, strong upward motion, low-level convergence, and vorticity patterns that supported the development of convective clouds. The atmospheric stability indices also indicated marginally unstable conditions that supported convective potential, particularly through the K-Index (KI) values, which suggested an increased probability of heavy rainfall. Integrated vapor transport also indicated a large and persistent moisture supply from the western Java waters, the Sunda Strait, and the western Java Sea toward Tangerang City. Therefore, the extreme rainfall event is influenced by the combination of strong moisture supply and atmospheric dynamic conditions that support intense convection.
Co-Authors Amanu, Rendy Syahril Amri, Sayful Arzhida, Bima Haryanto, Yosafat Doni Latifah Nurul Qomariyatuzzamzami Muhammad Fathurrachman Alghazali Sabrina , Purwanti Lelly Sabrina, Purwanti Lelly Yosafat Donni Haryanto