![]() ![]() With the advent of various novel concepts and reported success of several deployments, the ocean renewable energy sector, especially the field of tidal current and wave energy conversion technology have gained significant attention throughout the world. Other renewable ocean resource concepts, such as hydrothermal vents, along with hybridization of the aforementioned schemes, are also being pursued. Thermal energy due to the temperature gradient between the sea surface and deepwater can be harnessed using different Ocean Thermal Energy Conversion (OTEC) processes.Īt the mouth of rivers where fresh water mixes with salt water, energy associated with the salinity gradient can be harnessed using pressure-retarded reverse osmosis process and associated conversion technologies. Kinetic and potential energy associated with ocean waves can be harnessed using modular technologies. Potential energy associated with tides can be harnessed by building barrage or other forms of construction across an estuary, while kinetic energy associated with tidal (marine) currents can be harnessed using modular systems. Tide conditions are more apparent in coastal areas where constrained channels augment the water flow and increase the energy density. A number of phenomena relating to earth rotational tilt, rate of spinning, and interaction among gravitational and rotational forces cause the tide conditions to vary significantly over time. On the other hand, ocean tides are cyclic variations in seawater elevation and flow velocity as a direct result of the earth’s motion with respect to the moon and the sun and the interaction of their gravitational forces. Ocean wave generation, propagation and direction are directly related to these wind currents. The effects of earth’s temperature variation due to solar heating, combined with a multitude of atmospheric phenomena, generate wind currents in global scale. ![]() The energy in the ocean waves is a form of concentrated solar energy that is transferred through complex wind-wave interactions. Capturing this energy could have substantial benefits. Curious and unsuspecting people on the beach may run out to see exposed offshore sea life only to be overwhelmed when the breaking crest hits.The oceans contain a huge amount of energy. Tsunamis deliver a catastrophic blow to observers at the beach as the water in the trough in front of it is drawn back toward the tsunami wave, exposing the seafloor. This is called the tsunami runup, which destroys structures far inland. The massive wave may sweep inland well beyond the beach. Wave height builds up and the wave strikes the shore as a wall of water a hundred or more feet high. But as the wave train approaches the shore, each wave makes contact with the shallow seafloor, friction increases, and the wave slows down. Tsunamis may pass unnoticed in the open ocean because the wavelength is very long and the wave height is very low. The water is suddenly lifted and a wave train spreads out in all directions from the mound carrying enormous energy and traveling very fast (hundreds of miles per hour). Such waves are called tsunamis and, in the case of earthquakes, are created when a portion of the seafloor is suddenly elevated by movement in the crustal rocks below that are involved in the earthquake. This causes the wave to increase in height.Ī special type of wave is generated by any energetic event affecting the seafloor, such as earthquakes, submarine landslides, and volcanic eruptions. \): All waves, like tsunamis, slow down as they reach shallow water. ![]()
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