SUMMARYAn estuarine two-dimensional vertical ÿnite-element model of tidal ow has been established by laterally integrating Navier-Stokes equation. To this end, a moving grid ÿnite-element method has been used. An arbitrarily shaped quadrilateral element has been selected. This model has been validated by using ÿeld data from two monitoring stations at the North Passage of the Changjiang Estuary. Using this numerical model, two types of modelled results were obtained: (1) vertical distributions of tidal current velocities at the North Passage of the Changjiang Estuary; (2) longitudinal distributions of tidal current velocities at maximum ood tide, at high slack water, at maximum ebb tide and at low slack water tide at the North Passage of the Changjiang Estuary. The conclusion is that the model provides a reasonable agreement with observed data.
SUMMARYA new algorithm is proposed for generating interior nodal points within an arbitrary two-dimensional domain. The algorithm is based on a background triangle mesh and the contours on the background mesh. The newly generated points are exactly within the domain with smooth point densities and a good quality of the ÿnal mesh. An improved Delaunay triangulation algorithm using advancing front technique is also proposed. The present algorithm is more general and robust. A FORTRAN 90 program based on the present algorithms is developed and has been successfully applied in many projects. Examples are given to show the e ectiveness and robustness of the algorithms.
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