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http://dx.doi.org/10.9765/KSCOE.2019.31.2.73

Correlation Analysis between Beach Width and Wave Data on the East Coast of South Korea  

Oh, Jung-Eun (Coastal and Ocean Engineering Division, Korea Institute of Ocean Science and Technology)
Jeong, Weon-Mu (Coastal and Ocean Engineering Division, Korea Institute of Ocean Science and Technology)
Kim, Ki-Hyun (GeoSystem Research Corporation)
Kang, Tae-Sun (GeoSystem Research Corporation)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.31, no.2, 2019 , pp. 73-87 More about this Journal
Abstract
Ocean waves are the driving force for the sediment transport and the beach process. However, wave actions are nonlinear and non-stationary, and the response of the beach is inconsistent in terms of reaction rate and magnitude. Therefore, the beach process is difficult to predict accurately. The purpose of this study is to identify the correlations between the shoreline change and ocean waves observed in the east coast of Korea. The relation of the beach width obtained from video monitoring at five sandy beaches and the wave data obtained from nearby wave monitoring at three points was analyzed. Although the correlations estimated over the whole data sets was not significant, the correlations estimated based on the seasonal period or wave conditions provided more noteworthy information. When the non-exceedance probability of the wave height was greater than 0.99, the wave period and beach width showed strong negative correlations. In case the non-exceedance probability of the wave period was greater than 0.99, the wave height and beach width showed strong negative correlations as well. Furthermore, the erosion rate of the beach width increased when the primary wave direction was close to normal to the coastline. Little significant seasonal or monthly change was found between the beach width and the wave, but it was greatly affected by intensive events such as typhoons. Thus, it is necessary to analyze in detail the wave height or period level explaining the change of beach width for more relevant and practical information.
Keywords
wave monitoring; video monitoring; beach width; correlation coefficient; east coast;
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