SPATIO-TEMPORAL SCALES OF LAND COVER AND SHORELINE DYNAMICS IN BANAYBANAY, DAVAO ORIENTAL, PHILIPPINES USING AVAILABLE OPTICAL SATELLITE IMAGERY

Abstract. Shoreline dynamics are often the most visible indicators of changes that occur in coastal areas. It is essential to consider a shoreline's physical location while evaluating changes on a temporal and chronological scale. The shoreline in Banaybanay, Davao Oriental, has undergone significant land use changes, leading to negative impacts on related coastal processes, including mariculture conditions in the area. This study aims to determine changes in land cover and shoreline in Banaybanay’s coastal barangays by analyzing satellite images from 1989–2021 using remote sensing, GIS, and Digital Shoreline Analysis Systems (DSAS). The study found that rapid land cover changes in the area were primarily driven by development growth, urbanization, mining, and human activities. The Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR) results indicated accretion in Banaybanay’s coastal areas, corresponding to an increase in built-ups and barren from 1989–2021. Characterization of land cover and shoreline change revealed high erosion associated with land cover change of barren-water and grassland/brushland-water with a maximum erosion value of −1.19 m/yr. Conversely, very high accretion was mainly characterized by land cover change of water-built-up, barren-built-up, and water-barren with a maximum accretion value of 9.58 m/yr.