Artificial coastal-protection reef with energy generation unit with or without direct contact with seawater

An artificial reef for coastal protection comprising:

• an energy-generating unit configured for capturing kinetic energy and pressure differential energy resulting from a difference in water heights between wave crests and troughs, converting the kinetic energy and pressure differential energy into useful energy:
• at least one upper conduit including a plurality of apertures;
• at least one lower conduit including a plurality of apertures;
• the upper conduit and the lower conduit are substantially parallel to each other and in communication with each other to define a flow pathway from the upper conduit apertures through the lower conduit apertures;
• at least one directrix along the upper conduit proximate to an aperture and extending over at least a portion of the aperture to change a direction of horizontal flow under a wave's crest and concentrating the water flow into the aperture;
• at least one directrix along the lower conduit proximate to an aperture and extending over at least a portion of the aperture to change the direction of the outgoing flow transforming the outgoing flow into a flow in accordance with the direction of the natural flow under wave's trough to suction water out of the aperture;
• and,
• a valve between the upper and lower conduits configured to automatically close and automatically open in response to predetermined conditions.