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J. Ocean Eng. Technol. > Volume 38(5); 2024 > Article
J. Ocean Eng. Technol. 2024;38(5):269-281.    
Published online October 25, 2024.
DOI: https://doi.org/10.26748/KSOE.2024.067   

Beach Area Changes and Resilience of the Eastern Coasts Before and After Typhoon Goni
Tae-Soon Kang1  , Ho-Jun Yoo2  , Ki-Hyun Kim3 
1Executive Director, GeoSystem Research Corp., Gunpo, Korea
2Senior Researcher, Department of Coastal Management, GeoSystem Research Corp., Gunpo, Korea
3Executive Director, Department of Coastal Management, GeoSystem Research Corp., Gunpo, Korea
Corresponding author:  Ho-Jun Yoo, Tel: +82-31-5180-5779, yoohj@geosr.com
Received July 28, 2024   Revised September 18, 2024   Accepted September 30, 2024
© 2024 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Video monitoring, Typhoon Goni, Coastal erosion, Beach area, Resilience
Abstract
Due to climate change, waves have become increasingly stronger, making the analysis of beach changes before and after typhoons crucial for addressing beach erosion. This study utilized low-cost, high-efficiency video monitoring to analyze beach changes at 14 locations along Korea's east coast before and after typhoon impacts. Shorelines were extracted from 180 s average orthoimages using the Pixel Intensity Moving Average Extraction technique, and beach areas were calculated. The study focused on the recovery period following typhoon-induced erosion. During Typhoon Goni (2015), erosion reached up to 38% at Bongpo Beach, with a maximum affected area of 7,741 m2 at Goraebul Beach. Post-typhoon recovery exceeded 89%, with most beaches returning to pre-typhoon conditions. The erosion period averaged 7 d, while recovery took approximately 27 d. Erosion was significantly influenced by natural forces such as waves, tides, and wind. The erosion period showed minimal correlation with wave energy, whereas the recovery period exhibited some correlation. Further long-term analysis, incorporating additional wave data and typhoon impact periods, is needed. Future research will aim to collect extensive typhoon data to systematically analyze erosion and recovery cycles in relation to external forces.
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