Abstract
In numerical simulation of current and water quality in a sea under the influence of fresh water, problems related to reproducibility of the density distribution still remain. New observation stations has been set up in recent years and continues to measure and send out the vertical profiles of currents and such water quality as temperature, salinity and dissolved oxygen in some estuaries in Japan. In the present paper, four dimensional variational (4d-var) data assimilation is examined to improve the representation of the spatial distributions of salinity and water temperature, especially that of pycnocline in the innermost part of bay. The data which are observed at 10 stations in Osaka Bay every hour and includes 6 vertical profiles of salinity and temperature are used for the assimilation. The results show the great improvement of the representation of the profiles which do not contain the artificial distortions.
