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Marine Renewable Energy
Published in Dorothy Gerring, Renewable Energy Systems for Building Designers, 2023
Tides are caused by the gravitational pull of the moon and sun. Ocean currents are created by tides and the earth’s rotation. Surface waves are created by winds. In general, water and wind behave similarly, however water has a higher specific gravity so it can produce more electricity at lower velocities than wind.
Emerging Technologies in Conventional and Nonconventional Energy Sources
Published in Anirbid Sircar, Gautami Tripathi, Namrata Bist, Kashish Ara Shakil, Mithileysh Sathiyanarayanan, Emerging Technologies for Sustainable and Smart Energy, 2022
Yash Thakare, Sujay Kore, Swapnil Dharaskar
Tidal power is generated with the use of waves of the ocean. As a renewable energy source, tidal power has not yet been used owing to its expensive technology. Tides occur every 12 hours because of the gravitational pull of the moon. Alike hydroelectricity produced from dams, tidal water is trapped in a weir during tidal flow and enforced across hydro-turbines during low tides. Investment in tidal power plants is huge [28]. So in order to get enough energy from the tidal force, the peak of the high tides has to be at least sixteen feet elevated than the low tide.
Terra, Our Earth
Published in Thomas Hockey, Jennifer Lynn Bartlett, Daniel C. Boice, Solar System, 2021
Thomas Hockey, Jennifer Bartlett, Daniel Boice
The Sun causes tides, too. It does so in just the same manner as the attraction between the center of the Earth and the center of the Moon. The Sun is much more massive than the Moon, but it is also much farther away. Therefore, its gravitational force, and hence the gravitational differential it causes, is less than that of the Moon. Still, the net tide is the sum of the lunar and solar tides. When the Moon, Sun, and Earth are aligned during the New Moon or Full Moon, their effects combine to produce a high tide that is higher and a low tide that is lower than usual; this is a spring tide. When the Moon, Sun, and Earth are 90° from one another during First or Last Quarter Moon, their tides partially cancel each other to produce a high tide that is lower and a low tide that is higher than usual; this is a neap tide.
Hydrodynamic performance and the power production of the tidal turbine by new profiles at the leading-edge tubercles
Published in Ships and Offshore Structures, 2023
Mohamad Amin Ghazi, Hassan Ghassemi, Hamid Reza Ghafari
Tidal energy is a renewable source of energy based on the alternation of moving water's kinetic energy into mechanical power to run generators (Shi et al. 2015). Tidal energy has a projected global capacity of 120 GW and could produce up to 150 TWh every year (Abuan and Howell 2019). It has many advantages such as minimal dependence on fossil fuels and lower CO2 emissions; it is one of the best sources for handling concerns about weather changes (Mason-Jones et al. 2012). Tides are resulting from the gravitational effect of the sun and moon. One of the greatest features of this Phenomenon is its predictability (Bahaj et al. 2007; Khan et al. 2009). As the attention to tidal energy grows, many new tidal turbine blade designs have been constructed. The construction of tidal turbines for a given location depends on the speed of the water flow in that location and most regions around the world have rather medium current speeds ranging from 1 to 2 m/s. To make better use of tidal energy, we need new concepts and improvements in the design of tidal turbines to adapt them to the regions’ conditions (low flow velocities).
Assessment of potentially vulnerable zones using geospatial approach along the coast of Cuddalore district, East coast of India
Published in ISH Journal of Hydraulic Engineering, 2022
K. S. S. Parthasarathy, Subbarayan Saravanan, Paresh Chandra Deka, Abijith Devanantham
The gravitational pull exerted by the sun and the Moon combined results in the rise and fall of the sea-level known as tides. The vertical difference between the highest of the high tide and the lowest of the low tide is known as the tidal range. The tidal range is increased substantially by local effects such as shelving, funnelling, reflection, and resonance. Higher tidal range leads to larger wave attack with lots of energy in it resulting in the erosion of the shores whereas lesser tidal range leads to smaller wave comparatively with lesser energy likely to erode the coast slowly (Thieler and Hammar-Klose 1999). In coastal vulnerability view, permanent flooding is caused by high SLR resulting in the vulnerable to the coast. The rate of sea-level change was computed from tide gauges of WX Tide software.
Prediction, investigation, and assessment of novel tidal–solar hybrid renewable energy system in India by different techniques
Published in International Journal of Sustainable Energy, 2019
Tidal power or tidal energy is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity. Although not yet widely used, tidal energy has the potential for future electricity generation. Tides are more predictable than the wind and the sun. The tide or wave is a periodic rise and fall of the water level of the sea. Tides occur due to the attraction of seawater by the moon. Tides contain a large amount of potential energy which is used for power generation. When the water is above the mean sea level, it is called flood tide. When the water level is below the mean level, it is called ebb tide. The ocean tides rise and fall and water can be stored during the rise period and it can be discharged during fall (Guerra, Cienfuegos, and Thomson 2017). A dam is constructed separating the tidal basin from the sea and a difference in water level is obtained between the basin and the sea. During the high tide period, water flows from the sea into the tidal basin through the water turbine. when the tides raise above tidal basin then turbine unit operates and generates power, as it is directly coupled to a generator. Tide changes proceed via the following stages: Sea level rises over several hours, covering the intertidal zone; flood tide. The water rises to its highest level, reaching high tide. Sea level falls over several hours, revealing the intertidal zone; ebb tide. The water stops falling, reaching low tide (Khan and Iqbal 2005; Khare, Nema, and Baredar 2012).