LANDSLIDES
A
landslide is the movement of material slope forming a rock, materials debris,
soil, or a mixture of materials is, move down or out slopes.
Cause
of the landslides can be divided into two factors, namely : the natural factors
and the human factors.
1. Natural
Factors
Natural
factors are factors causing landslides caused by nature itself as a result of
activities of nature such as :
a. Long dry season
b. weathered rock
c. High rainfall
d. Erosion, and others.
|
a. Long
dry season
The dray season is a pair of rainy
season in the region of bi season. The long drought season is season very hot
with drought-term a long time
|
|
|
b.
Weathered rock
A weathered rock is a process of
rock destruction caused by water, temperature, and wind.
|
|
|
c.
High Rainfall
High rainfall is the total rain water
that falls to the ground in a given time ranged between 2000-3000 mm on the
year.
|
|
|
d. Erosion
Erosion is the annihilation events
solids (sediment, soil rock, and particle others) as a result of wind,
transport, water or ice.
|
|
·
First,
the long dry season came and causes the evaporation of water in the soil
surface in large numbers, resulting in the appearance of pores or cavities in
the soil, which resulted in cracks and surface cracks.
·
And
then, at the time it rained water seeped into the soil will add weight to the
ground.
·
Finally
the water penetrates the soil watertight that serves as the field slip, the
ground becomes slippery and soil weathering on it will move to follow slope and
exit slopes.
2. The
Human Factors
a.
Deforestation
b.
Mining
wild
c.
Cutting
vegetation on the slopes
d.
Residential
areas on the slopes, and others
|
a. Deforestation
In a relatively barren area also
frequent landslides because binding of
ground water is very less.
|
|
|
b.
Mining Wild
Illegal mining can damage the
environment and can be form steep
slopes or holes. The slopes so let usually granted so landslides can occur.
|
|
|
c.
Cutting vegetation on the slopes
Cutting vegetation on the slopes
can be causing landslides because the water contained in the soil can not be
tied without vegetation.
|
|
|
d. Residential
areas on the slopes
The existence additional load will
increase the force drives of erosion. As a result common land subsidence and
cracks to direction of the valley.
|
|
The occurrence of landslides by the
human factors can described as follows :
Used
illegal mining and residential areas on the slopes of causing damage to soil
and vegetation occur because of deforestation then converted to residential
land becomes barren and can form steep slopes or holes.
·
When
the bulk high rainfall the soil becomes unstable and experienced erosion.
·
Mass
load is becoming increasingly more land and increase the driving force
landslide.
·
Because
the does not happen vegetation and occur deforestation, it cause the soil can
not bind water and landslides occurred.
Source :
1.
Source of information by Dra Ni Putu Parwati,
S.Pd of Geographic Teacher in SMA N 1 Bebandem
2.
http//www.scribd.com
3.
http//www.sepengetahuanku-ilmu-sosial.com
|
By :
1.
Ni Komang Yanti Suartini (28)
2
|
Tidak ada komentar:
Posting Komentar