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WIND  versus WAVES  in HK

the average wind speed in HK is force 3-4 on Beaufort scale = 3.4 m/s to 7.9 m/s ==> average = 5 m/s
the average wave height in HK  is 2 m  .
For a typical wind turbine of 50 meters in diameter (2000 M2) we can generate :           P =
1.2  D*2   V*3  0.3  =  45 KW .
                                                                                                                                                             2
for a Motorwave of 300m in length  (1500 M2)  we can generate                                        P = 70 H*4   0.2            = 224 KW

to match the same power a wind turbine has to be of 100 meters in diameter .(10 000 M2)


a typical wind turbine of   50 m  cost approximatively :    700 000 US$
a typical wind turbine of 100 m  cost approximatively : 2 500 000 US$
a Motorwave   cost                                                            :    200 000 US$

the simple explanation is : the  air (wind) density is near sea approx       1.2  :         1.2 kg /M3
                                         : the water (wave) density                approx 1100     :      1100 kg /M3  

the energy of an object can be quantify as :
 
E = M V  or     E  = 1/2 M V*2    or E = M g H    where M is the mass and V is the speed and H is the height .

It is therefore easy to understand that, the heavier M is, the higher E will be .

Just for easy understanding (because it is not exactly correct ) the same wind turbine with a same fluid speed  will be 1000 times more powerful in water than on land .