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Earth flow
1. Earth Flow
K. Diyes B. Amarathunga
11/SS/005
Geology
Faculty
Of Geomatics
Sabaragamuwa University Of Sri Lanka
2. Mass Wasting
• Mass wasting is the geomorphic process by
which soil, sand, regolith, and rock move
downslope typically as a mass, largely under
the force of gravity..
• Mass wasting, also known as slope
movement or mass movement.
6. Flows
• ‘Movement of soil and regolith that more
resemble fluid behaviour is called’ as a flow.
• Flow includes :
Rock Avalanches
Mudflows
Debris flows
Earth flow
Sturzstroms
7.
8. • Earthflows are one of the gentler kinds of
landslide.
• It consist of soil and weathered rock—earth—
and they move as a fluid—flow.
• An earthflow may affect as few as several
square meters or up to several hectares.
Earth Flow
13. Reasons for Earth Flows..?
• Clay, fine sand and silt, and fine- grained
pyroclastic materials are susceptible to
earthflows .
• When the ground materials become saturated
with enough Water, they will start flowing.
• Because of the dependency on water content for
the velocity of the flow, it can take minutes or
years for the materials to move down the slope.
14. • Most commonly
heavy rains
• Volcanic eruptions
• Earthquakes
La Conchita
1995 earthflow
Reasons for Earth Flows..?
15. How Earth Flows can be reduced..?
• Afforestation
A place can be prepared as a forest where there was no
forest.
16. How Earth Flows can be reduced..?
• Re-forestation
Moderating the lands which are in a risk of Earth
Flows.
17. How Earth Flows can be reduced..?
• Terracing steps on slopes
Making a land which is at a risk with Earth Flow, as a
steps to avoid the flowing.
18. • Covering the landslide with an impermeable
membrane.
• Directing surface water away from the landslide.
• Draining ground water away from the landslide
• Minimizing surface irrigation.
How Earth Flows can be reduced..?
