earth flow
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Earth Flow
K. Diyes B. Amarathunga11/SS/005
Geology
Faculty Of GeomaticsSabaragamuwa University Of Sri Lanka
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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.
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Koslanda Disaster
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Mass Wasting
Creeps Landslides Flows Slump Falls
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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
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• 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
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•Earthflows often begin as slumps.
•Usually, like slumps, they do not move very fast.
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Road cut caused Earthflow
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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.
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• Most commonly heavy rains
• Volcanic eruptions• Earthquakes
La Conchita
1995 earthflow
Reasons for Earth Flows..?
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How Earth Flows can be reduced..?
• Afforestation A place can be prepared as a forest where there was no forest.
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How Earth Flows can be reduced..?• Re-forestation
Moderating the lands which are in a risk of Earth Flows.
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How Earth Flows can be reduced..?
• Terracing steps on slopesMaking a land which is at a risk with Earth Flow, as a steps to avoid the flowing.
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• 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..?
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Earth flow
• ..\Earthflow and Landslide in Italy.mp4
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Thank You..