Hardik' world
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Transcript of Hardik' world
TO
HARDIK’SPRESTATION
Class Xa1Subject SSc Teacher
MRS. VINEY
• H
ow D
o Cy
clon
es O
ccur
?
The start of a cyclone is when air heated by the sun rises very swiftly which creates areas of very low air pressure. As the warm air rises it becomes loaded with moisture which condenses into huge thunder clouds.
Cool air rushes in to fill the void that is left, but because of the consent turning of the earth axis the air is bent inwards then spirals upwards with great force.
The swirling wind rotate faster and fast er, forming a huge circle which can be up to 2,000 km across.
At the centre of the storm is a calm, cloudless area called the eye where there no rain and the winds are fairly light.
As the cyclone build up it begins to move. It is sustained by a steady flow of moist air.
The vulnerability of a human settlement to a cyclone is determined by its sitting, the probability that a cyclone will occur, and the degree to which its structures can be damaged by it. Buildings are considered vulnerable if they cannot withstand the forces of high winds. Generally those most vulnerable to cyclones are lightweight structures with wood frames, especially older buildings where wood has deteriorated and weakened the walls. Houses made of unreinforced or poorly-constructed concrete block are also vulnerable. Urban and rural communities on low islands or in unprotected, low- lying coastal areas or river floodplains are considered vulnerable to cyclones. Furthermore, the degree of exposure of land and buildings will affect the velocity of the cyclone wind at ground level, with open country, seashore areas and rolling plains being the most vulnerable. Certain settlement patterns may create a "funnel effect" that increases the wind speed between buildings, leading to even greater damage.
MOST VULNERABLE HOMES
Effects on Buildings
As a consequences of the storm surge and wind pressures acting on elements obstructing the passage of wind the following types of damage are commonly seen to occur during high wind speeds: Uprooting of trees which disrupts
transportation and relief supply mission. Damage to improperly attached
windows. Damage to roof.
SAFEConstruction
PRACTICES
During
Cyclone
1.Site selection.2.Platforms and orientation.3.Foundation.4.Wall Opening.5.Glass Paneling.6.Roof Architecture.
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