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Shoreline change detection in Jepara regency, Indonesia, using multitemporal Landsat imagery from 1994 to 2024
 
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Faculty of Fisheries and Marine Science, Diponegoro University, Semarang, Indonesia
 
 
Autor do korespondencji
Fadil Apresia   

Faculty of Fisheries and Marine Science, Diponegoro University, Semarang, Indonesia
 
 
 
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This research examines the dynamics of shoreline changes in Jepara Regency, Indonesia, by utilizing multitemporal Landsat images spanning from 1994 to 2024.The coastal areas of Jepara face significant challenges due to erosion and accretion, exacerbated by anthropogenic activities and climate change. Previous studies in the region have been limited to single image analysis without examining long-term shoreline dynamics. To address this knowledge gap, this research integrates multitemporal Landsat imagery with the Digital Shoreline Analysis System (DSAS) to reveal erosion-accretion patterns and predict future shoreline changes. The study area encompasses eight coastal sub-districts in Jepara Regency, stretching from Kedung in the west to Donorojo in the east. Shoreline data extraction was performed using the Normalized Difference Water Index (NDWI) and Otsu's thresholding method. DSAS was employed to calculate shoreline change rates, including Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR). The results indicate varying shoreline dynamics across the sub-districts, with Donorojo experiencing significant accretion with an average LRR value of 1.23 m/year and an average EPR of 0.86 m/year. Conversely, Kedung is facing critical erosion with an average LRR value of -9.67 m/year and an average EPR of -9.75 m/year. Predictions using the Kalman filter suggest increasing trends of erosion and accretion in several sub-districts over the next 10 to 20 years. In 2034 and 2044, erosion occurred on the Kedung Malang coast with NSM values of -301.39 m and -440.37 m, respectively. Meanwhile, the highest accretion in the same years occurred on the Ujungwatu coast, with NSM values of 263.67 m and 353.48 m, respectively. The findings highlight the need for responsive strategies to mitigate the adverse impacts of shoreline changes and utilize the potential of accreting areas for sustainable coastal management in Jepara Regency.
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