Analysis of Coastal Changes in Lumajang Regency Over a 30-Year Period (1994-2024) Utilizing Remote Sensing and GIS Data

Nazariano Rahman Wahyudi, Fadil Apresia

Abstract


Coastal areas in Lumajang Regency, Indonesia, provide a variety of ecosystem services for coastal communities, including improving the region's economy in the trade, fisheries, and fishing sectors. In addition, it is a habitat for marine biodiversity, such as coral reefs, seagrass, and mangrove ecosystems. This study investigated coastal erosion and accretion patterns in Lumajang Regency, Indonesia, over three decades (1994-2024) using remote sensing and Geographic Information System (GIS) techniques. Landsat satellite imagery was analyzed using the Normalized Difference Water Index (NDWI) to extract shoreline positions, and the Digital Shoreline Analysis System (DSAS) was employed to quantify the rates of change. The results revealed that complex coastal dynamics are influenced by both natural processes and human activities. Accretion dominated the earlier decades, whereas erosion has become more prevalent in recent years. Significant erosion hotspots were identified near estuaries, particularly at the Bondoyudo and Kali Glidik Estuaries, highlighting the impact of fluvial processes on coastal morphology. Conversely, substantial accretion was observed in the Pasiran District, notably at the Watu Pecak and Dampar beaches. The End Point Rate (EPR) analysis showed an average shoreline change rate of 8.25 m/year (1994-2004), 9.69 m/year (2004-2014), and -8.06 m/year (2014-2024). The analysis of the LRR parameters revealed that the Lumajang Regency coast has tended to accrete at an average rate of 3.94 m/year over the past three decades. This study emphasizes the importance of continuous monitoring and the need for adaptive management approaches to address the challenges posed by ever-changing coastal areas.

Keywords


Coastal; Erosion and Accretion; DSAS; Remote Sensing; GIS

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v50.2.7246

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