| As part of a multinational project to map the temporal evolution oftemperature and velocity fields of the Ulleung Basin (UB) in theJapan/East Sea, 23 pressure-sensor-equipped inverted echo sounders (PIES)were deployed from June 1999 to June 2001. Although tidal research wasnot the focus of this project, tidal pressure fluctuations were measuredby the PIES array. Tidal coefficients were extracted from each pressuretime series, and combined with coefficients from coastal tide stationsand some tidal current coefficients from shallower water in thesouthwestern part of the UB to form cotidal maps of the entire UB.This was accomplished by assimilating the tidal data into a barotropictide model through a strong-constraint variational approach making useof an adjoint model. The data were fitted to the shallow water equationsin a least-squares sense by adjusting only the incoming gravity wavesalong the model boundaries. Surface height prediction errors were∼0.7 cm for the PIES sites and ∼1.3 cm for the coastal tidestations. Barotropic current prediction errors for the current sites were∼3.0 cm/s. The results from the data-assimilation technique werecompared to results from an optimal interpolation technique and a fullerror analysis was performed. The flux of tidal energy from theEast China Sea to the Japan/East Sea was analyzed using the resultsfrom this study and the results from a data-assimilation model ofthe Korea/Tsushima Strait. |
|
|