A 3-D numerical model is set up in a large domain covering the Hang zhou Bay and the Changjiang Estuary based on the ECOM model in orthogonal curvilinear coordinates.The numerical schemes for baroclinic pressure gradient (BPG) terms and convective terms are improved in the paper according to the characteristics of velocity field and mass transport in the area.The model is validated by the simulations of residual current and salinity transport in the Hangzhou Bay and the Changjiang Estuary.
Four indexes of species diversity (H'), species richness (d), species evenness (J) and species dominance (D2) are used in this paper to analyse the.characteristics of the benthic faunal community structure in the soft-bottom intertidal zone along the northern coast of the Hang-zhou Bay.The results show a rather simple benthic faunal community structure in the survey area, with the average values of the four indexes from the five transects, namly, H'=2.06, d=3.34, J=0.46 and D2=0.73.Different degrees of the seasonal and regional variations have been observed from each index per transect.
Bated on the paleogcomagnetum ot the sediments derived from drilling cores in the Jiao-zhou Bay and the 14C-dating, combined with the analyses of the paleomicrobiology, spore-pollen, grain size and ainino acid, the following results are obtained:(ⅰ) Structural fractures formed the framework for the Jiaozhou Bay. (ⅱ) jiaozhou Bay was a continental basin during the low tea level of the glacial period in 20000-11000 yr BP. (ⅲ) Sea level rose again, thus forming the initial Jiaozhou Bay during the poit-glacial period since 11000 yr BP. (ⅳ) Distribution of the sub-marinf relief of the Jiaozhou Bay was finally formed due to the reconstruction of As tidal current and the fluvial hydrodynamical actions, (ⅴ) It can be estimated that the Holocene of the jiaozhou Bay began at 11000 yr BP on the basis of the comparison between the sedirnental characteristics of the Jiaozhou Bay and that of the Huaoghai Sea.