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This idea poses a lot of ecological problems:
a) by sinking the catamarans, they will damage the seabottom , which is the source of nutrients for microplankton.
b) The turbines will reduce the water speed, and this will affect macroalgae. Macroalgae play an important role in absorbing CO2, so the project can potentially accelerate global warming if conduced to global scale.
c) The turbines will suck and chop any fish passing nearby, so the consequences for the fauna and local economy can be dammatical.
d) which material should be these turbines made of? Corrossion is inevitable, so the the particles of corroded metals will tend to cumulate in the influence zone of the local tidal currents. If made of plastic, much worse: it has been demonstrated that plastics hydrolize in sea water and the decomposed matter can carry carcinogenic compounds.
e) What happens with sediment? By intercepting a fluid current and driving energy, the fluid will reduce its speed, hence the sediments wil tend to cummulate in the influence area of the installation. Apart from the aforesaid ecologic problems, maintaining the turbines free of sediments will cost a lot of money.