In the paper, the sea is divided into two layers with density jumping, assuming that the physical parameters in each layer are independent of depth. Two-layer flow field with tide and wind currents is calculated with extended ADI method, after the calculation for flow field is stable , coupled with temperature diffusion equations and thermohaline depth prediction equation, a four-day time prediction of the surface, bottom temperature and thermohaline depth of the Huanghai and the Bohai Seas. At the same time, three dimensional temperature field of sea water is predicted through vertical temperature distribution function. The result indicates that the prediction quality of the whole model and the fitting degree between the predicted result and the measured values are satisfactory. 相似文献
Nineteen cheniers formed in the middle and late Holocene have been distinguished and studied.
In fair weather the wave action along the Yangtze Delta is weak, with a wave height of 0.5–1.0 m and average wave energy of 0.127 erg/s. However, in late summer and early autumn the coastal area is usually swept by typhoons, which sometimes are extremely violent. The development of cheniers is mainly controlled by these strong typhoons. As a result, a number of the sedimentary characteristics of the cheniers are related to the typhoon-generated high-energy environment.
Moreover, the study shows that the top elevation of a fully developed chenier indicates the spring high water level during a violent typhoon (11–12 on the Beaufort scale). 相似文献
Based on the numerical model shown in Ref. [1], a dynamic analysis is given for the storm surges caused by the four typhoons (i. e. typhoons Nos. 5310, 5612, 6126 and 6207) on the east coast of Zhejiang and Jiangsu Provinces, in which the contributions of various dynamic factors to local surge elevation are calculated numerically, including the Coriolis force, the atmospheric pressure force, the bottom friction, the local topography and the couple nonlinear interactions between surge current and elevation as well as between surge currents themselves. Moreover, the responses of these factors to different kinds of typhoon tracks and water depths are discussed in more detail, and the effects of grid size on the computed results demonstrated. 相似文献