Analysing decadal-scale crescentic bar dynamics using satellite imagery: A case study at Anmok beach, South Korea SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 5 time in Scopus
Title
Analysing decadal-scale crescentic bar dynamics using satellite imagery: A case study at Anmok beach, South Korea
Author(s)
Athanasiou, Panagiotis; de Boer, Wiebe; Yoo, Jeseon; Ranasinghe, Roshanka; Reniers, Ad
KIOST Author(s)
Yoo, Jeseon(유제선)
Publication Year
2018-11-01
Abstract
Understanding long-term sandbar dynamics can be crucial for informed coastal zone management, but is often hampered by data availability. To increase the number of sandbar observations available from bathymetric surveys, this study proposes and evaluates a method to manually extract the sandbar location using freely available satellite imagery for the case study of Anmok beach in South Korea. Validation of the satellite extracted sandbar locations against 9 in-situ measurements shows good agreement with errors well within the pixel resolution of the satellite imagery (i.e. 30 m for Landsat missions). The applicability of the method is constrained to locations where (1) the cross-shore crescentic length scales are larger than the image resolution, (2) frequent wave breaking and clouds are absent and (3) the water clarity is sufficient to enable the manual extraction of the sandbar crest line. Using the additional sandbar observations from the satellite imagery significantly increases the temporal extent and resolution of the dataset for Anmok beach. This allows the study of sandbar characteristics, dynamics and impacts of human interventions to an extent that would not have been possible without the satellite imagery. Within the study period 1990-2017 it is found that the sandbar maintains a persistent crescentic pattern that is only altered during prolonged and very intense storm conditions. The cumulative alongshore migration of the sandbars is investigated and found to be in the order of hundreds of meters over the 27 years study period. Comparing the sandbar characteristics prior and after the construction of Gangneung port shows that both the amplitudes and wavelengths of the sandbar crescents near the port have decreased after its construction.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/806
DOI
10.1016/j.margeo.2018.07.013
Bibliographic Citation
MARINE GEOLOGY, v.405, pp.1 - 11, 2018
Publisher
ELSEVIER SCIENCE BV
Subject
SANDBAR BEHAVIOR; EMBAYED BEACH; VARIABILITY; MECHANISMS; MORPHOLOGY; SYSTEM; MODEL; COAST
Keywords
Crescentic sandbars; Satellite imagery; Sandbar dynamics; Human interventions; Anmok beach
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Coastal disaster,Coastal numerical modeling,Coastal remote sensing,연안재해,수치모델링,연안 원격탐사

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