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HUG Slab Wave

Slab Wave Potential



A slab is a piece of reef that sticks out in deep water or deep water sits behind it. Most slabs break in the same spot.  In the figure below, the HUG slab wave, 1, moves fast and hits a shallow reef, 4, at full speed. It lifts out of nowhere within seconds. HUG Slab waves are heavy reef breaks coming out of deep water and breaking in very shallow water. As a thick lip unloads on a shelf, the water doesn’t have anywhere to go but upwards overtopping into a reservoir with all their open-ocean energy intact. That energy gets focused as the depth suddenly decreases.

HUG Slab Wave

Acceleration = a = g (acceleration of gravity) = 9.8 m3/sec                                                                      (Final Velocity)2 = 2 x a x s

In the summer, the head of water is 1.5 m from water forcing through the automatic gates of the artificial reef:

Final Velocity = 5.42 m/sec for 1.5 m drop (s):

 In the winter, the head of water is 5 m from water washing over the walls of the artificial reef:

Final Velocity = 9.9 m/sec for 5 m drop (s) of the crest to sea level.

       Wave heights during storms may exceed 10 meters (33 feet)


HUG Slab Wave

  • Final Power of the Helical Turbine

The formula for Kinetic Energy is KE= ½ x A x V 3 x (.35) efficiency (A = area swept; Velocity)

Diameter of the Helical Turbine in the HUG is 1 m. The radius is 0.5 m: A = π r2 = π (0.5)2 = .785 m2      

  • = ½ x .785 m2 x (42 m/sec)3 x .35 = 21.9 kW/turbine in summer  x 7= .153 MW HUG System
  • = ½ x .785 m2 x (9 m/sec)3 x .35 = 132.6 kW/turbine in winter  x 7= .927 MW HUG System

The velocity of the speed at which a wave travels in winter: period is every 7 seconds for a velocity of 7.6 m/sec (25 ft/sec).

The average height is normally 3m to 4m (10 ft to 13 ft). The slab wave increases by 250%: 7.5 m to 10 m

The individual waves break when their wave height H is larger than 0.8 times the water depth h: a breaker 2 m high would occur in water 2.4 m deep.


HUG Slab Wave

Wave heights are amplified in the region of shallower water. At the wave period of 7 seconds, the significant wave height is 2 m high at depths of 12 m. The slab wave configuration raises the height to 5 m.

The formula for Kinetic Energy is KE= ½ x A x V 3 x (.35) efficiency (A = area swept; Velocity).       

 (Diameter of the Helical Turbine Area: 1 m) = .5 x .5 x 3.14 = .785 m2  The area of the throat of the HUG is .785 m2: radius is 0.5 meter.

HUG Slab Wave Continue reading HUG Slab Wave