| In the research on the characteristics of small-scale sea currents in tidal energy test sites at home and abroad, there is a lack of high -precision mathematical models to simulate the hydrodynamic characteristics under real environmental conditions. This paper establishes a numerical model of tidal currents in the waters of the Zhoushan and Putuoshan-Huludao tidal energy test sites based on the unstructured grid Finite-Volume Coastal Ocean Model (FVCOM). After validating the model with wide-area tidal data, more accurate open boundary conditions for small-scale areas are obtained and nested within the larger domain for tidal flow calculations. By comparing and adjusting the local bed friction values near the device based on the fitting data of tidal variation from four gauge stations, as well as measured tidal levels, flow velocities, and directions, the influence of the device is generalized. Simultaneously, the propagation law of tidal waves and the hydrodynamic characteristics of the flow field in the small-scale area are analyzed.The results indicate that the tidal type in the test area is irregular semidiurnal, with bidirectional tidal currents dominating. The main direction of tidal current propagation is SSE—NNW, and there is significant spatial variation in tidal current characteristics in the area. During flood tide in the Longnan Reef Bay on the left bank, counterclockwise propagation is observed, while vortexes reverse during ebb tide; no significant eddies are observed during tide rise and fall in the Dalongshan Peninsula Bay on the right bank. These findings can provide theoretical references for optimizing the layout of tidal energy generation devices in the test site area. |
