Department of Civil and Environmental Engineering, Sungkyunkwan University, Suwon, KOREA

bhchoi@yurim.skku.ac.kr

　

There is now general agreement of M2 dissipation by 2.5 ± 0.05TW based on four separate astronomic observational programs. Allowing for the bodily tide dissipation of 0.1 TW leaves 2.4 TW for ocean dissipation. Previous model results from global tidal models on bottom dissipation via finite difference grid (1/5°resolutions) and finite element mesh based model (230,000 nodes) approximates the above-mentioned quantity as a whole. However the accuracy of the global tidal model has been verified in terms of the vertical tides, not the horizontal tide, which may the important for correct estimation of tidal dissipation in the shallow waters.

　

To resolve the coastal shelf seas and deep ocean together in detail with finite element meshes based model we have tested a series of model consists of 93,000 nodes, 350,000 nodes and then 2,200,000 nodes fine resolution global tidal model. Some of preliminary model results reproducing eight major tidal constituents are presented and discussed.

　

　

Coastal and Harbor Engineering Research Laboratory, KORDI Seoul, KOREA

swkang@kordi.re.kr

　

The main interest in modeling sea-surface wind fields due to typhoons and other tropical storms has been related to wave and storm surge prediction modeling which requires a specification of the surface wind or the surface wind stress at a very high temporal and spatial resolution throughout the history of a typhoon event.

　

The sea-surface winds during the passages of 85 typhoon events for the period of 1979 - 1999 which were hindcasted by two different wind models, i.e., Rankin vortex parametric model and primitive vortex model, were compared with the winds observed at ocean data buoys and coastal monitoring station. Sensitivity analysis of the hindcast winds was made with the two different ocean data buoy locations in the East China Sea and East Sea (Japan). The RMS and relative error analysis of hindcast winds with the approaching distance from moving typhoon centers were obtained to assess surface wind models for wave and storm surge prediction modeling.

　

　

¹Department of Civil Engineering, Graduate School of Engineering Kyoto University, Uji, JAPAN

kokim@rcde.dpri.kyoto-u.ac.jp

　

²Department of Civil and Environmental Engineering Sungkyunkwan University, Suwon, KOREA

　

Tides in the Yellow and East China Seas (YS-ECS) are the most characteristic process among intermediate scale process in the region, of which the tidal range reaching up to 8.5 m in the Inchon Bay, eastern Yellow Sea. For resolving complex coastline shape and bathymetry in the Yellow and East China Seas, numerical models using triangular finite element mesh systems are investigated. For the formulation of adaptive mesh system, simple editor was developed to properly resolve the complex depth variation and irregular coastlines, in graphic user interface environment including automatic quality mesh generation function by the Delaunay refinement algorithm, manual mesh modifying functions and pre/post-processing functions.

　

We have tested four FEM models for application of tidal simulation in Yellow and East China Seas: 33D linear frequency domain model, 2-D non-linear frequency domain model, 2-D non-linear time-stepping model and 3-D non-linear time-stepping model. The bottom friction is adopted to 0.0025 and 8 major tidal components were prescribed along the open boundaries at the shelf edge. The calculated results were compared with the existing charts, previous model results, coastal tidal observations and limited moored current observations.

　

Results are presented and discussions are made to make further model studies to combine major interacting process i.e. waves, surges together.