Tidal Power
Tidal Power :- it is the form of renewable
energy source in which tides convert into electrical energy. Turbine convert
the movement of water change in tides,
the kinetic energy into electrical energy. These large underwater turbines are placed
in areas with high tidal movements. Gravitational
pull of the moon and sun along with the rotation of the earth cause the tides.
Tidal occurrence are not limited to the oceans,
but can occur in other system.
Tides changes via following
stages:-
- water rises to its highest level, arriving high tide
- water stops falling, reaching at low tide
- Sea level rises over some hours, wrapping the intertidal zone.
- Sea level falls over some hours, disclose the intertidal zone
There are three different
ways to generate tidal energy :-
1.
Tidal Lagoons
2.
Tidal Streams
3.
Tidal Barrages
Tidal lagoons:- a power station which generate
electrical energy by natural rise and fall of the tides. Tidal lagoons design
is to construct circular
retaining walls embedded with turbine. This type of wall is commonly known as a
rubble mound breakwater with a sand core. The wall will be constructed using
marine construction methods
Tidal streams :- tidal currents occur by rise and fall of tides
in horizontal direction, Tidal
stream generators make use of the kinetic energy of moving water to power
turbines. It is very similar to wind turbines
Tidal Barrages :- tidal barrages is like a hydro power dam. A
barrage is built across a river. Gates and turbine built into the dam wall,
these gates are opened, allowing the
tide to flow in, and turn the turbine. These types of dams can be used not only to produce renewable
energy, but also to reduce flooding.
Some Tidal power stations in the
world:-
Power Station Country
Capacity
MW
Annapolis
Royal Generating Station Canada 20
Jiangxia
Tidal Power Station China 3.2
Kislaya Guba
Tidal Power Station Russia 1.7
Rance Tidal
Power Station France 240
Sihwa Lake
Tidal Power Station South Korea
254
Strangford
Lough SeaGen United Kingdom
1.2
Uldolmok
Tidal Power Station South
Korea 1.5
Eastern
Scheldt Barrier Tidal Power Plant Netherlands 1.25
Advantages of Tidal Power :-
1. Tidal barrages provide protection
against flooding
2. High predictability as high and low
tides
3. Tidal energy is not expensive to
operate and maintain as compare to other renewable energy resources
4. No noise produced by tidal energy
5. Eco friendly
6. Efficiency of tidal power is far
greater as compared to coal, solar or wind energy
7. The life of tidal energy power plant
is quite long
8. Tidal energy does not require any
kind of fuel to run
9. Tides store a lot of energy, giving
tidal energy a high energy density
Disadvantages of Tidal Power :-
1.
Intensity of sea currents is unpredictable and there can be
damage of power generation unit
2.
Tidal power generation is short period of time generation
depends upon movement of tides.
3.
They can disrupt the migration of marine life
4.
Turbine blades
can kill marine wildlife
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