Industrial The hydraulic jump is the most commonly used choice of design engineers for energy dissipation below spillways and outlets. A properly designed hydraulic jump can provide for 60-70% energy dissipation of the energy in the basin itself, limiting the damage to structures and the streambed. Even with such efficient energy dissipation, stilling basins must [...]
Tidal Energy
The latest articles related to Tidal Energy
In metric theories of gravitation, particularly general relativity, a test particle is an idealized model of a small object whose mass is so small that it does not appreciably disturb the ambient gravitational field. According to the Einstein field equation, the gravitational field is locally coupled not only to the distribution of non-gravitational mass-energy, but [...]
Briscoe (1975) succinctly noted that “We cannot yet answer satisfactorily the questions: ‘where does the internal wave energy come from, where does it go, and what happens to it along the way?’” Although technological advances in instrumentation and modeling have produced greater knowledge of internal tide and near-inertial wave generation, Garrett and Kunze (2007) observed [...]
The gravitational attraction that the Moon exerts on Earth is the major cause of tides in the sea; the Sun has a lesser tidal influence. If the Earth possessed a global ocean of uniform depth, the Moon would act to deform both the solid earth (by a small amount) and ocean in the shape of [...]
There are no major wave farms off of the United States coast for the production of electricity from wave energy. Although this is the case, according to the president of trade association Ocean Renewable Energy Coalition, “The total potential off the coast of the United States is 252 million megawatt hours a year.” Despite the [...]
The European Marine Energy Centre (EMEC) based at Stromness in Orkney is a new Scottish Executive-backed research facility. They have installed a wave testing system at Billia Croo on the Orkney mainland and a tidal power testing station on Eday. Eday Partnership, the local development trust is active in promoting the island’s economy and has [...]
Compact stars form the endpoint of stellar evolution. A star shines and thus loses energy. The loss from the radiating surface is compensated by the production of energy from nuclear fusion in the interior of the star. When a star has exhausted all its energy and undergoes stellar death, the gas pressure of the hot [...]
A number of universities active in wind energy in the 1970s met under umbrella of the ITDG Wind Panel (Intermediate Technology Development Group). The BWEA was formed from the ITDG Wind Panel along with other interested parties and representatives from industry, to promote wind power in the United Kingdom. The inaugural meeting of the BWEA [...]
Aquanator is a proposed device using hydrofoils (an underwater version of airfoils) to generate electricity from water currents. “Aquanator” is a trademark of Atlantis Resources Corporation Pte. Limited. The Aquanator utilizes rows of sail-like aquafoils/hydrofoils to generate electricity from water currents. These devices can be compared to as underwater windmills. They turn silently and power [...]
There are several alternative energy conditions in common use: Weak energy condition The weak energy condition stipulates that for every future-pointing ”timelike vector field” vec{X}, the matter density observed by the corresponding observers is always non-negative: *:rho = T_{ab} , X^a , X^b ge 0. Strong energy condition The strong energy condition stipulates that for [...]
The main agents responsible for deposition and erosion along coastlines are waves, tides and currents. The formation of coasts is also heavily influenced by their lithology. The harder the material the less likely it is to erode or suffer the effects of erosion. Variants in the rock create different-shaped coastlines. Tides often determine the range [...]
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