Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System

Once a beach is eroded by storm waves, it is generally recovered under milder wave conditions. To prevent or reduce damage, it is therefore important to understand the characteristics of the site-specific recovery process. Here, we present the results, based on a data set from a video monitoring sys...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Jung-Eun Oh, Weon-Mu Jeong, Kyong-Ho Ryu, Jin-Young Park, Yeon-S. Chang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	beach erosion storm waves recovery process video monitoring pocket beach Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/451f0041988545b98b00e5b55ab438c3
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:451f0041988545b98b00e5b55ab438c3
record_format	dspace
spelling	oai:doaj.org-article:451f0041988545b98b00e5b55ab438c32021-11-11T15:15:10ZMonitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System10.3390/app1121101952076-3417https://doaj.org/article/451f0041988545b98b00e5b55ab438c32021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10195https://doaj.org/toc/2076-3417Once a beach is eroded by storm waves, it is generally recovered under milder wave conditions. To prevent or reduce damage, it is therefore important to understand the characteristics of the site-specific recovery process. Here, we present the results, based on a data set from a video monitoring system and wave measurements, of the recovery process in a pocketed beach located inside a bay where the shoreline retreated harshly (~12 m, on average, of beach width) during Typhoon TAPAH (T1917) in September 2019. It took about 1.5 years for the beach to be recovered to the level before the typhoon. During this period, the erosion and accretion were repeated, with the pattern highly related to the wave power (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>); most of the erosion occurred when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> became greater than 30 kWatt/m, whereas the accretion prevailed when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> was no greater than 10 kWatt/m. The recovery pattern showed discrepancies between different parts of the beach. The erosion during storm events was most severe in the southern part, whereas the northern shoreline did not significantly change even during TAPAH (T1917). In contrast, the recovery process occurred almost equally at all locations. This discrepancy in the erosion/accretion process was likely due to human intervention, as a shadow zone was formed in the northern end due to the breakwaters, causing disequilibrium in the sediment transport gradient along the shore. The results in this study could be applied in designing the protection plans from severe wave attacks by effectively estimating the size of coastal structures and by correctly arranging the horizontal placement of such interventions or beach nourishment. Although the application of these results should be confined to this specific site, the method using wave energy parameters as criteria can be considered in other areas with similar environments, for future planning of beach protection.Jung-Eun OhWeon-Mu JeongKyong-Ho RyuJin-Young ParkYeon-S. ChangMDPI AGarticlebeach erosionstorm wavesrecovery processvideo monitoringpocket beachTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10195, p 10195 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	beach erosion storm waves recovery process video monitoring pocket beach Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	beach erosion storm waves recovery process video monitoring pocket beach Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Jung-Eun Oh Weon-Mu Jeong Kyong-Ho Ryu Jin-Young Park Yeon-S. Chang Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
description	Once a beach is eroded by storm waves, it is generally recovered under milder wave conditions. To prevent or reduce damage, it is therefore important to understand the characteristics of the site-specific recovery process. Here, we present the results, based on a data set from a video monitoring system and wave measurements, of the recovery process in a pocketed beach located inside a bay where the shoreline retreated harshly (~12 m, on average, of beach width) during Typhoon TAPAH (T1917) in September 2019. It took about 1.5 years for the beach to be recovered to the level before the typhoon. During this period, the erosion and accretion were repeated, with the pattern highly related to the wave power (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>); most of the erosion occurred when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> became greater than 30 kWatt/m, whereas the accretion prevailed when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> was no greater than 10 kWatt/m. The recovery pattern showed discrepancies between different parts of the beach. The erosion during storm events was most severe in the southern part, whereas the northern shoreline did not significantly change even during TAPAH (T1917). In contrast, the recovery process occurred almost equally at all locations. This discrepancy in the erosion/accretion process was likely due to human intervention, as a shadow zone was formed in the northern end due to the breakwaters, causing disequilibrium in the sediment transport gradient along the shore. The results in this study could be applied in designing the protection plans from severe wave attacks by effectively estimating the size of coastal structures and by correctly arranging the horizontal placement of such interventions or beach nourishment. Although the application of these results should be confined to this specific site, the method using wave energy parameters as criteria can be considered in other areas with similar environments, for future planning of beach protection.
format	article
author	Jung-Eun Oh Weon-Mu Jeong Kyong-Ho Ryu Jin-Young Park Yeon-S. Chang
author_facet	Jung-Eun Oh Weon-Mu Jeong Kyong-Ho Ryu Jin-Young Park Yeon-S. Chang
author_sort	Jung-Eun Oh
title	Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
title_short	Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
title_full	Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
title_fullStr	Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
title_full_unstemmed	Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System
title_sort	monitoring of recovery process at yeongildae beach, south korea, using a video system
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/451f0041988545b98b00e5b55ab438c3
work_keys_str_mv	AT jungeunoh monitoringofrecoveryprocessatyeongildaebeachsouthkoreausingavideosystem AT weonmujeong monitoringofrecoveryprocessatyeongildaebeachsouthkoreausingavideosystem AT kyonghoryu monitoringofrecoveryprocessatyeongildaebeachsouthkoreausingavideosystem AT jinyoungpark monitoringofrecoveryprocessatyeongildaebeachsouthkoreausingavideosystem AT yeonschang monitoringofrecoveryprocessatyeongildaebeachsouthkoreausingavideosystem
_version_	1718436076034457600

Monitoring of Recovery Process at Yeongildae Beach, South Korea, Using a Video System

Ejemplares similares