Natural reefs act as barriers by dissipating the energy of water currents providing shelter to marine life as well as to coast lines and any other structures in the water... Artificial reefs are created by strategically placing structures underwater to achieve any of the desired benefits that come with naturally occurring reefs.
Tidal flow refers to the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. The effects of tidal flows on the movement of water and adjoining shoreline can be substantial.
Land and seabed erosion due to the effects of tidal flow often have a detrimental effect on marine life. Preserving the marine environment and encouraging the growth of fish and vegetation is an important factor in the global food chain.