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

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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.
  • 3.
  • 5. Mass Wasting Creeps Landslides Flows Slump Falls
  • 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
  • 9.
  • 10.
  • 11. •Earthflows often begin as slumps. •Usually, like slumps, they do not move very fast.
  • 12. Road cut caused Earthflow
  • 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..?
  • 19. Earth flow • ..Earthflow and Landslide in Italy.mp4