Studi Perubahan Garis Pantai Amurang Pascabencana Abrasi Melalui Analisis Time-Lapse Citra UAV

Julio J. Timporok(1), Joyce Christian Kumaat(2), Maxi Tendean(3),


(1) Program Studi Geografi, Fakultas Ilmu Sosial dan Hukum, Universitas Negeri Manado
(2) Program Studi Geografi, Fakultas Ilmu Sosial dan Hukum, Universitas Negeri Manado
(3) Program Studi Geografi, Fakultas Ilmu Sosial dan Hukum, Universitas Negeri Manado
Corresponding Author

Abstract


The sudden occurrence of abrasion disaster in Amurang Beach, resulting in the loss of some areas, requires geospatial technology-based studies to understand the dynamics of coastal morphology. This research aims to analyze the changes of Amurang shoreline after the abrasion disaster with a time-lapse approach based on Unmanned Aerial Vehicle (UAV) imagery. The research study was descriptive quantitative with remote sensing approach. The analysis technique used on-screen digitizing method and time-lapse analysis through baseline and comparative data. Baseline data was obtained through UAV imagery acquisition (2023) to represent the latest post-disaster conditions. Meanwhile, comparative data was used to compare shoreline changes before and after the event, including satellite imagery (2021) and UAV imagery (2022). Based on the time-lapse analysis, the overlay of the dataset processing results showed that the comparison of shoreline position experienced a significant impact with a reduction in area of 3.07 hectares within 2 years. The quantification of other metrics revealed the existence of critical abrasion patterns divided into two categories. The Extreme Abrasion Zone, located at the front of the Ranowangko River estuary, experienced a shoreline shift of up to 130 meters. Where thematic objects such as built-up land, transportation networks, and residential areas experience landslides into the sea. The Medium Abrasion Zone, occurring at the closest side of the river mouth, which is also affected by erosion, experiences a shoreline shift or moves back towards land by < 90 meters. Utilization of UAV data acquisition provides high precision in documentation of abrasion impacts and identification of abrasion-prone zones. This study recommends the integration of UAV data with comprehensive advanced analysis to predict future coastal morphology dynamics, so as to support more adaptive and proactive data-driven mitigation policies

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DOI: 10.36412/jepst.v5i3.3869

DOI (PDF): https://doi.org/10.36412/jepst.v5i3.3869.g1756

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