A pump using tidal changes to generate compressed air, preferably for a tidal barrier. The pump includes (a) a floatation system comprising a floatation assembly that floats on water and a structure supported on the floatation assembly; (b) a piston assembly comprising a shaft with a top end, a bottom end, and a head, the top end of the shaft being affixed to the structure and the bottom end of the shaft being affixed to the head; and (c) a cylinder with a bottom end anchored to the sea bed, the cylinder having a closed top end with an opening through which the shaft extends, the cylinder housing the head of the piston assembly within the cylinder, wherein, the flotation system, the structure, and the piston assembly actuate in response to level changes of the body of water to compress air in the cylinder.
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