自然灾害最终.ppt

Natural disasters
-- Flood
L99
-XNHUAREY
Two basic link to the flood
1 The formation of the flood
2\ Damage to human beings
1 The formation of the flood
Heavy rain, a lot of snow and ice melt
quickly、 channel jam
the ground slope
① Natural Flood gathered「 the soil moisture
causes
rate
content
the vegetation
coverage
Flood discharge Valley slope
rate
Valley unobstruct
degree
Cause the flood gathered
Plants was
quick
destroyed Make the so
ose and valley
hum an
Jam
causes
A lot of lakes were carried out resulting
the discharge capacity decline
Many buildings were built in the valley
w hich caused the lakes' discharge
capacity decline
Which incr eased the possibility of the flood
hArmness
Washed out houses, roads and Bridges
Direct. Flooded farmland, villages and factories
Human and animal casualties
Of. The cause of disease outbreaks
OSS
Make urban and rural commercial
I ndirect activities stop and make people's life
Loss disordered
Make
water, electricity, transportation, energy
supply in disrupt
The characters of the flood
(1) Floods in the region of the human
activities will cause flooding
(2) The more densely populated in the disaster
areas, the higher the risk loss
(3) The more advanced the economy, the
loss may be more serious