Mass Movements aka Landslides Def: movement of sediment due to GRAVITY.

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Presentation transcript:

Mass Movements aka Landslides Def: movement of sediment due to GRAVITY.

oladventures/soil/name_soil.html oladventures/soil/name_soil.html

Italy Landslide

ROCKFALL

Rockfall- boulders

ROCKSLIDE

I-40 North Carolina Nov ► nJTi0 nJTi0 nJTi0

AVALANCHE ► Fast movement of snow ► Caused by a weak layer of snow underneath surface ► Usually in Spring ► m/watch?v=B0RWLxO FGLY m/watch?v=B0RWLxO FGLY m/watch?v=B0RWLxO FGLY Avalanche Danger In Colorado At 30 Year High, Says Expert; 6 Fatalities So Far This Season

documents/accidents/US_avalanche_ fatalities_by_user_group_by_year_ XXX.pdf documents/accidents/US_avalanche_ fatalities_by_user_group_by_year_ XXX.pdf

Mudflow/Mudslide ► Mudflow- clay mixed with water ► Usually in spring- snowmelt

Mudflow Oso, Washington 2014 ► XScw8 play first 7 minutes XScw8 XScw8 ► Worst landslide disaster in US history ► 48 died

VYjE&feature=player_popoutmudslide

Lahar- volcanic ash and water MT ST HELENS

SLUMP ► Saturation of water + loss of friction causes soil below surface layer to drop downhill. ► Surface stays intact

Bingham Copper Mine, Utah april 12, 2013

slump ► tX5nk&feature=player_detailpage tX5nk&feature=player_detailpage tX5nk&feature=player_detailpage

CREEP ► SLOW movement of soil ► Causes tilting of objects ► Usually soil ► Result of freeze/thaw

CREEP

Creep

SOLIFLUCTION ► IN ARTIC CLIMATES ► In spring when top layer melts, moves slowly over permafrost

ARE MASS MOVEMENTS WEATHERING OR EROSION?

Factors influencing Mass Movement ► 1. Amount of moisture  More adds weight and makes slippery ► 2. angle of slope ► 3. lack of vegetation  Roots hold back movement ► 4. rock type  Sedimentary worst ► 5. Roundness of particle  Rounder move faster

Causes of landslides ► Vwmfk Vwmfk Vwmfk

2015 Mass movements ear= ear=2015

Laguna Beach 2005

Philippines Feb dead

Sleeping bear dunes 1995

Prevention methods ► Fences/walls  Temporary fix  Gravity will win eventually!

Prevention methods ► Leave enough space!

Prevention methods ► Leave enough space!

Prevention methods ► Plant vegetation ► Roots act as anchors

Prevention methods ► Provide good drainage- excellent way!

Prevention methods ► Provide good drainage