Seasonal variations in coastal morphology of a composite gravel beach using UAV remote sensing
Abstract
Understanding beach changes in various temporal and spatial scales plays an important role for coastal processes and management. Commonly, the seasonal variations in coastal change could be interpreted by winter and summer morphology with regional geologic and oceanographic processes. While morphological evolution of sandy beaches is well known, morphology associated with seasonal changes for gravel beaches are rarely known. Especially, composite gravel beaches have drawn special attention because of limited systematic investigation on morphodynamic process. To figure out seasonal beach changes of a composite gravel beach, we selected Bang-po beach located in the west coast of South Korea, and analyzed morphological changes of a composite gravel beach between winter and summer based on the comparative analysis of ortho-mosaic images and digital surface models derived from UAV-based survey. As a result, coastal features including shore platform, sand dune and ripple mark were observed in the sand-dominated intertidal zone, and cusp and berm for the gravel-dominated upper shoreface both winter and summer season. Also, migration of coastal features is detected, and exposure of shore platform is increase with change of proportion between sand and gravel area.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMEP23C2341B
- Keywords:
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- 0442 Estuarine and nearshore processes;
- BIOGEOSCIENCESDE: 1625 Geomorphology and weathering;
- GLOBAL CHANGEDE: 1641 Sea level change;
- GLOBAL CHANGEDE: 3020 Littoral processes;
- MARINE GEOLOGY AND GEOPHYSICS