Energy - põhjalik referaat energiast
Only about 20 locations have good
inlets and a large enough tidal range- about 10 feet- to produce energy economically. The
simplest generation system for tidal plants involves a dam, known as a barrage, across an
inlet. Sluice gates on the barrage allow the tidal basin to fill on the incoming high tides and
to empty through the turbine system on the outgoing tide, also known as the ebb tide.
There are two-way systems that generate electricity on both the incoming and outgoing
tides.
Tidal barrages can change the tidal level in the basin and increase turbidity in the water.
They can also affect navigation and recreation. Potentially the largest disadvantage of tidal
power is the effect a tidal station can have on plants and animals in the estuaries.
There are currently two commercial sized barrages in operations. One is located in La
Rance, France; the other is in Annapolis Royal, Nova Scotia, Canada. The US has no tidal
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