Fine grid tidal modeling of transient tidal eddies behind two headlands off southeast Korea

Title
Fine grid tidal modeling of transient tidal eddies behind two headlands off southeast Korea
Author(s)
강석구; 마이크포만; 이재학; 김은진; 정경태
KIOST Author(s)
Kang, Sok Kuh(강석구)Lee, Jae Hak(이재학)Kim, Eun Jin(김은진)
Alternative Author(s)
강석구; 이재학; 김은진; 정경태
Publication Year
2015-11-05
Abstract
The time-evolution of tide-induced transient eddies behind two headlands, off the southeastern tip of Korean Peninsula, is investigated using current mooring data and numerical modeling. It is shown that two transient eddies, with length scales of several hundreds of meters to 3 km, are generated by current shears resulting from flow past the headlands, and through a detailed comparisons with observations, can be accurately simulated with a numerical model. Even though the tidal elevation was still in flood phase for another 2-3 hours, the direction of the tidal flow at one mooring was observed to be opposite to the tidal wave propagation. This is due to the presence of a transient clockwise eddy which changes the current direction behind the headland. The successful reproduction of the time-evolving eddy motion at two different scales is shown to be dependent on the time- and spatially-varying lateral eddy viscosity. Based on harmonic analyses of the model results, trapped spatial phase patterns in the M2 tide and distorted co-amplitude lines around the headland are seen to be associated with the transient eddies, and strongly indicate that there are nonlinear interactions between the transient eddies and the tidal wave.ales of several hundreds of meters to 3 km, are generated by current shears resulting from flow past the headlands, and through a detailed comparisons with observations, can be accurately simulated with a numerical model. Even though the tidal elevation was still in flood phase for another 2-3 hours, the direction of the tidal flow at one mooring was observed to be opposite to the tidal wave propagation. This is due to the presence of a transient clockwise eddy which changes the current direction behind the headland. The successful reproduction of the time-evolving eddy motion at two different scales is shown to be dependent on the time- and spatially-varying lateral eddy viscosity. Based on harmonic analyses of the model results, trapped spatial phase patterns in the M2 tide and distorted co-amplitude lines around the headland are seen to be associated with the transient eddies, and strongly indicate that there are nonlinear interactions between the transient eddies and the tidal wave.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/25139
Bibliographic Citation
2015 한국해양학회 추계학술대회, pp.30, 2015
Publisher
한국해양학회
Type
Conference
Language
English
Publisher
한국해양학회
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