A nonhydrostatic oceanic regional model, ORCTM v1, for internal solitary wave simulation

[摘要] The Oceanic Regional Circulation and Tide Model (ORCTM), including anonhydrostatic dynamics module which can numerically reproduce internalsolitary wave (ISW) dynamics, is presented in this paper. The performanceof a baroclinic tidal simulation is also examined in regional modelingwith open boundary conditions. The model control equations are characterized by three-dimensional andfully nonlinear forms considering incompressible Boussinesq fluid in Z coordinates. The pressure field is decomposed into the surface,hydrostatic, and nonhydrostatic components on the orthogonal curvilinearArakawa-C grid. The nonhydrostatic pressure determined by the intermediatevelocity divergence field is obtained via solving a three-dimensionalPoisson equation based on a pressure correction method. Model validationexperiments for ISW simulations with the topographic change in thetwo-layer and continuously stratified ocean demonstrate that ORCTM has aconsiderable capacity for reproducing the life cycle of internal solitarywave evolution and tide–topography interactions.

[学科分类] 土木及结构工程学