BEACH PROFILE DYNAMICS IN DULAG, LEYTE, PHILIPPINES USING LANDSAT IMAGERY

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Year:
2016
Type of Publication:
In Proceedings
Keywords:
Shoreline, shoreline dynamics, Landsat, DSAS
Authors:
Rabi, Sheila Marie S.; Collander, Bror Ragnar Lorenzo Isagani; Beltran, Christine R.; Palo, Rianel April A.; Jr., Humberto R. Montes; Garcia, Pastor P.
Abstract:
Shoreline is the most dynamic part of the seascape which is an indicator of coastal erosion and accretion. Shoreline change can be analyzed and quantified using remotely-sensed data measuring differences in past and present shoreline locations. Shoreline change analysis provides information for government agencies, coastal residents and consultants on coastal protection and counteractions on the adverse effects of shoreline dynamics. This study aims to examine the extent and calculate the rate of shoreline change in Dulag, Leyte, Philippines from 1989-2014 using Landsat 4, 7 and 8 imageries with 30 m resolution. Midinfrared band 5, which displays the best spectral balance of land and water, was used in the extraction of shorelines. Degree of erosion and accretion between shoreline periods were measured based from a 10.2 km baseline with 102 transect locations at 100 m interval generated using an ArcMap extension, Digital Shoreline Analysis System (DSAS) Tools. Results showed that the municipality of Dulag is experiencing erosion and accretion along its shore at the rate of 0.973 m/yr. and 1.076 m/yr. respectively. The highest incident of erosion was observed in 2004-2010 at a rate of 2.43m/yr. while highest rate of accretion was observed in 2010-2014 with 2.607 m/yr. accretion rate.
Full text: Ab 0555.pdf [Bibtex]
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