The Coffee Bean & Tea Leaf(CBTL), Business strategy case study
Hardik' world
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6. 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.
7. 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.
8. The swirling wind
rotate faster and
fast er, forming a
huge circle which
can be up to 2,000
km across.
9. At the centre of
the storm is a
calm, cloudless
area called the
eye where there
no rain and the
winds are fairly
light.
10. As the cyclone build up it begins to
move. It is sustained by a steady
flow of moist air.
11. 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.
12. 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.
