mass movements aka landslides
DESCRIPTION
Mass Movements aka Landslides. Def: movement of sediment due to GRAVITY. http://www.youtube.com/watch?v=QdsxtCtX5nk&feature=player_detailpage. ROCKFALL. Rockfall- boulders. ROCKSLIDE. I-40 North Carolina Nov. 2009. http://www.youtube.com/watch?v=ZVYGJYnJTi0. AVALANCHE. - PowerPoint PPT PresentationTRANSCRIPT
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Mass MovementsMass Movementsakaaka
LandslidesLandslides
Def: movement of sediment Def: movement of sediment due to GRAVITYdue to GRAVITY..
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http://www.youtube.com/watch?v=QdsxtCtX5nk&feature=player_detailpage
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ROCKFALL
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Rockfall- bouldersRockfall- boulders
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ROCKSLIDE
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I-40 North CarolinaI-40 North CarolinaNov. 2009Nov. 2009
►http://www.youtube.com/watch?v=ZVYGJYnJTi0
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AVALANCHEAVALANCHE
► Fast movement of Fast movement of snowsnow
► Caused by a weak Caused by a weak layer of snow layer of snow underneath surfaceunderneath surface
► Usually in SpringUsually in Spring►http://www.youtube.
com/watch?v=B0RWLxOFGLY
Avalanche Danger In Colorado At 30 Year High, Says Expert; 6 Fatalities So Far This Season
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Snowbird, UT Snowbird, UT Nov. 2011Nov. 2011
► Jamie Pierre, here performing an extreme jump, was killed while snowboarding near Gad Valley on
Sunday.
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TellurideTelluride
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http://www.nwac.us/media/http://www.nwac.us/media/uploads/documents/accidents/uploads/documents/accidents/
US_avalanche_fatalities_by_userUS_avalanche_fatalities_by_user_group_by_year_1997-2XXX.pdf_group_by_year_1997-2XXX.pdf
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Mudflow/LaharMudflow/Lahar
►Mudflow- clay mixed with waterMudflow- clay mixed with water►Usually in spring- snowmeltUsually in spring- snowmelt
►Lahar- volcanic ash mixed with waterLahar- volcanic ash mixed with water
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MudflowMudflowJava 2007Java 2007
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http://www.youtube.com/watch?v=VMJiibdVYjE&feature=player_popout
►http://www.youtube.com/http://www.youtube.com/watch_popup?watch_popup?v=VMJiibdVYjE&vq=small#t=34v=VMJiibdVYjE&vq=small#t=34
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Lahar
MT ST HELENS
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SLUMPSLUMP►Saturation of water + Saturation of water + loss of friction causes loss of friction causes
soil soil belowbelow surface layer surface layer to drop downhill.to drop downhill.
►Surface stays intactSurface stays intact
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CREEPCREEP
► SLOW movement of SLOW movement of soilsoil
► Causes tilting of Causes tilting of objectsobjects
► Usually soilUsually soil► Result of Result of
freeze/thawfreeze/thaw
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CREEP
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CreepCreep
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SOLIFLUCTIONSOLIFLUCTION
► IN ARTIC CLIMATESIN ARTIC CLIMATES► In spring when top layer melts, moves In spring when top layer melts, moves
slowly over permafrostslowly over permafrost
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ARE MASS MOVEMENTS ARE MASS MOVEMENTS WEATHERING OR WEATHERING OR EROSION?EROSION?
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Factors influencing Mass Factors influencing Mass MovementMovement
► 1. Amount of moisture1. Amount of moisture More adds weight and makes slipperyMore adds weight and makes slippery
► 2. angle of slope2. angle of slope► 3. lack of vegetation3. lack of vegetation
Roots hold back movementRoots hold back movement► 4. rock type4. rock type
Sedimentary worstSedimentary worst► 5. Roundness of particle5. Roundness of particle
Rounder move fasterRounder move faster
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Mass movementsMass movements
►Cost US $4 billion per yearCost US $4 billion per year
►http://landslides.usgs.gov/recent/http://landslides.usgs.gov/recent/index.php?year=2009&month=Octindex.php?year=2009&month=Oct
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Landslide Causes?Landslide Causes?
►http://www.youtube.com/watch?http://www.youtube.com/watch?v=JrV4uCVwmfkv=JrV4uCVwmfk
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Laguna Beach 2005Laguna Beach 2005
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Philippines Feb. 2006Philippines Feb. 20061800 dead1800 dead
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Sleeping bear dunes 1995Sleeping bear dunes 1995
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Prevention methodsPrevention methods
► Fences/wallsFences/walls Temporary fixTemporary fix Gravity will win Gravity will win
eventually!eventually!
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Prevention methodsPrevention methods
► Leave enough Leave enough space!space!
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Prevention methodsPrevention methods
► Leave enough Leave enough space!space!
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Prevention methodsPrevention methods
► Plant vegetationPlant vegetation► Roots act as Roots act as
anchorsanchors
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Prevention methodsPrevention methods
► Provide good drainage- excellent way!Provide good drainage- excellent way!
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Prevention methodsPrevention methods
► Provide good Provide good drainagedrainage