Comprehensive Prediction of Large-height Swell-like Waves in East Coast of Korea

Thursday, 18 December 2014
Seok Jae Kwon, Korea Hydrographic and Oceanographic Administration, Busan, South Korea, Changhoon Lee, Sejong University, Dept. of Civil & Environmental Engineering, Seoul 143-747, South Korea, Suk Jin Ahn, GeoSystem Research Corporation, Gunpo 435-824, South Korea and Ho-Kyun Kim, Korea Hydrographic and Oceanographic Administration, Busan 606-806, South Korea
There have been growing interests in the large-height swell-like wave (LSW) in the east coast of Korea because such big waves have caused human victims as well as damages to facilities such as breakwaters in the coast. The LSW was found to be generated due to an atmospherically great valley in the north area of the East Sea and then propagate long distance to the east coast of Korea in prominently southwest direction (Oh et al., 2010).
In this study, we will perform two methods, real-time data based and numerical-model based predictions in order to predict the LSW in the east coast of Korea. First, the real-time data based prediction method uses information which is collected by the directional wave gauge installed near Sokcho. Using the wave model SWAN (Booij et al., 1999) and the wave ray method (Munk and Arthur, 1952), we will estimate wave data in open sea from the real-time data and predict the travel time of LSW from the measurement site (near Sokcho) to several target points in the east coast of Korea. Second, the numerical-model based method uses three different numerical models; WW3 in deep water, SWAN in shallow water, and CADMAS-SURF for wave run-up (CDIT). The surface winds from the 72 hours prediction system of NCEP (National Centers for Environmental Prediction) GFS (Global Forecast System) will be inputted in finer grids after interpolating these in certain domains of WW3 and SWAN models. The significant wave heights and peak wave directions predicted by the two methods will be compared to the measured data of LSW at several target points near the coasts. Further, the prediction method will be improved using more measurement sites which will be installed in the future.

Booij, N., Ris, R.C., and Holthuijsen, L.H. (1999). A third-generation wave model for coastal regions 1. Model description and validation. J. of Geophysical Research, 103(C4), 7649-7666.
Munk, W.H. and Arthur, R.S. (1952). Gravity Waves. 13. Wave Intensity along a Refracted Ray. National Bureau of Standards Circular 521, Washington D.C., 95-108.
Oh, S.-H., Jeong, W.-M., Lee, D.Y. and Kim, S.I. (2010). Analysis of the reason for occurrence of large-height swell-like waves in the east coast of Korea. J. of Korean Society of Coastal and Ocean Engineers, 22(2), 101-111 (in Korean).