Sea surface current measurement experiment by CODAR HF radar at coastal water of Eastern of the Yellow Sea and comparisons with different types of coastal circulation models

摘要

As a part of an intensive joint field experiment held in eastern coastal water of the Yellow Sea in November, 1992, a field measurement experiment was carried out using CODAR HF Radar off the west coast of Korea where a strong tidally driven flow is superposed with rather steady wind driven flow in winter season. The sea surface currents in shallow coastal waters were measured by the HF radar during Nov 15 to 19, 1992. Surface current maps were obtained over an area of about 30 x 30 km and had been compared with results of different types of numerical circulation models. Tide and wind induced flows were computed using 2-D and 3-Dimensional coastal circulation models. The offshore boundary condition of the circulation models was prepared from tide harmonic data base for the Yellow Sea and the East China China Sea and simultaneous water elevation measurement along the boundary during the experiment. Wind stresses and sea-level atmospherical pressure data set reanalyzed by ECMWF were used as meteorological inputs. The tidally induced currents modelled by 2-D circulation model when the wind was relatively weak and wind driven surface flow modelled by 3-D circulation model when the wind was relatively strong and steady were compared with the field measurements. Simple method of empirical calculation of the surface wind driven flow superposed by tidal current calculated by operational real-time tidal current prediction method, CHARRY, developed by Y.Kang (1996) was also compared with those from other models and HF radar data.