| Authored by the Chinese oceanographers Zhu Jianrong and Shen Huanting, the members of the State Key laboratory of Estuarine and Coastal Research, the monograph entitled “THE PROCESSES OF THE EXPANSION OF THE CHANGJIANG DILUTED WATER" with 200000 Chinese words, was published by the East China Normal University Press in March 1997. It is the first monograph in which a three-dimension nonlinear baroclinic shallow water and continental shelf model in σ-coordinate system was developed to study the dynamic processes of the expansion of the Changjiang River diluted water (ECDW).
The model calculation domain covered the Bohai Sea, Yellow Sea and East China Sea, and had fine horizontal and vertical resolutions of 7.5' × 1.7' and 11 layers. The altemating direction implicit computational scheme was adopted for the numerical solution of the model equation.
Since the ECDW was closely related to the residual currents induced by the boundary forces and wind, density current and tide induced residual currents in the sea area outside Changjiang River mouth, the residual currents were numerically simulated and their potential impacts on the ECDW were separately considered. The impacts exerted by the bottom topography, baroclinicity and their interaction on the ECDW were simulated numerically, and the computational results were further analyzed dynamically in terms of the vorticity equation involving the bottom topography, water level slope, and their interaction with baroclinicity.
The main focus in this monograph was placed on the summertime ECDW, especially its turning direction. The influence of factors such as runoff, Taiwan Warm Current, wind field, Yellow Sea Cold Eddy, on the wintertime ECDW was numerically and dynamically analyzed in detail and numerically simulated. The simulations showed that the Changjiang diluted water turned northeastward in summer and expanded southward along the coast in a narrow band in winter. The circulation structures of the East China Sea in summer and winter were reconstructed, and new ideas and interesting results were obtained in this study. The authors pointed out that the Yellow Sea Cold Eddy and the wind field play important roles in turning the direction of the Changjiang diluted water in summer, whereas the Taiwan Warm Current and Changjiang River runoff cannot affect its turning direction. Resulting mainly from the bottom configuration and baroclinicity and their interaction, the summertime Changjiang diluted water is characterized by a jet-like stream near to the river mouth.
This book presents a new viewpoint on the summertime ECDW which differed from that the traditional one and has high scientific valus for people who want to understand the processes of the ECDW. |
