英文：有关“洪涝灾害”的作文如题
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英文：有关“洪涝灾害”的作文如题
英文：有关“洪涝灾害”的作文
如题
英文：有关“洪涝灾害”的作文如题
http://wenku.baidu.com/view/c633ea6925c52cc58bd6be4b.html
The Cause of Floods and Limiting Their Damage
Rivers flood because of many reasons. Some reasons are deforestation.
This causes flooding because the trees and plants cannot absorb the
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The Cause of Floods and Limiting Their Damage
Rivers flood because of many reasons. Some reasons are deforestation.
This causes flooding because the trees and plants cannot absorb the
water because they are not there. There is no interception so
therefore nothing can be absorbed. An additional reason for rivers
flooding is too much precipitation. This means rainfall, snowfall and
hail. When it rains too much, the rainfall can fall straight into the
river or fall on the ground and infiltrate. This will then run towards
the river or percolate into the rocks underneath. This can cause the
water level to rise if there is not a great deal of sun to evaporate
the rainfall. A different cause of flooding is frozen ground or snow
thawing out. When it melts it causes surface run-off. This then runs
into the river, causing the river level to rise and overflow. This
would instigate soil saturation on the flood plain. The flood plains
can also become dry and cracks appear in the soil. The hot weather can
mean flash floods. When these happen, the ground is too dry and solid
for the water to infiltrate. This water then runs off into the river
and then causes the water level to rise. Flood plains are also
potential cause for floods. This is because they are very flat and if
it is built upon, then the concrete will not absorb it because it is
impermeable.
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