Abstract
The 3-D Princeton Ocean Model with tidal forcing supplied by 2-D barotropic model) was used to examine the time-depth variability and features of tidal current, turbulence and power density with a special reference to assess potential tidal stream energy resources in the Taiwan Strait (TS). Numerical simulations showed that semidiurnal tidal currents are predominant in the TS, with along-channel mean amplitudes exceeding 1.0 ms−1. Over the Chang-Yuen Rise (CYR) and in the Peng-Hu Cannel (PHC) turbulence exhibits symmetry while in the cross-slope direction to the south from the CYR turbulent asymmetry changes from ebb-dominant to flood-dominant. The maximum values of eddy diffusivity within the bottom boundary layer of about 10 m ranged from ~10-3 to 10-2 m2 s-1. The simulation revealed that, in the PHC, bottom shear turbulence, on the ebb, is suppressed by strong stratification due to the inflowing of dense water from the South China Sea. Numerical simulations revealed several potentially attractive locations for tidal turbines in the TS where power density had relative low flood/ebb asymmetry and exceeded 100 Wm-2. In the PHC, a highly attractive site where power density exceeded 300 Wm-2 was identified near the PH Archipelago.
Highlights
As interest in renewable marine energy increases, the number of investigations of tidal currents and analyses of their properties is growing
Stars denote the sites with a high power density and low tide asymmetry
Narrow jet-like slope current that meanders during the tidal cycle. Such a location with an unstable current position is an example of an unsuitable site for tidal turbines
Summary
As interest in renewable marine energy increases, the number of investigations of tidal currents and analyses of their properties is growing. Understanding these properties enables the identification of prospective sites where tidal energy converters (TECs) will be most efficient. It is not the only means of assessing potential sites for deploying tidal turbines, the most popular method is numerical simulations of water circulation and inferring the turbulence characteristics and power density from model outputs. Extreme loads experienced in such conditions are likely to constrain the proximity of a turbine to the surface with respect to the efficiency of tidal energy conversion
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