Tidal movement is the dominant force causing shelf sea circulation. Variation of the climate creates seasonal circulation. A high performance shelf sea hydrodynamic model can enhance the understanding of various marine processes. The shelf sea area around Taiwan has complicated features mainly due to the interaction with the Pacific Ocean current. Pollution problems associated with high-density exploitation of the marine resources, coastal constructions and marine disposal facilities. A large-area fine resolution hydrodynamic model can provide long term and detailed hydrodynamic information for the assessment of various coastal and marine developments and constructions. It can provide information for marine pollution simulation and for hazardous release management. Grid size becomes small when detailed local resolution is required. In order to maintain the same model boundary features, computations become enormous. Conventional sequential model cannot efficiently provide simulation results. In this paper, a tidal flow model, which covers an area of the Taiwan Strait and its adjacent seas, has been implemented on several parallel machines. These contain either shared memory machines and distributed memory machines. Since PC-clusters become popular, the experiences of porting the model on PC-clusters will be included in this paper. The performances among various types of parallel computers will also be presented and discussed.
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