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

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Presentation on theme: "Mass Movements aka Landslides Def: movement of sediment due to GRAVITY."— Presentation transcript:

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

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

3 Italy Landslide

4 ROCKFALL

5 Rockfall- boulders

6 ROCKSLIDE

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8 I-40 North Carolina Nov ► nJTi0 nJTi0 nJTi0

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10 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

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

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

21 Mudflow Oso, Washington 2014 ► https://www.youtube.com/watch?v=Gmghid XScw8 play first 7 minutes https://www.youtube.com/watch?v=Gmghid XScw8 https://www.youtube.com/watch?v=Gmghid XScw8 ► Worst landslide disaster in US history ► 48 died

22 VYjE&feature=player_popoutmudslide

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24 Lahar- volcanic ash and water MT ST HELENS

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

29 Bingham Copper Mine, Utah april 12, 2013

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36 slump ► https://www.youtube.com/watch?v=QdsxtC tX5nk&feature=player_detailpage https://www.youtube.com/watch?v=QdsxtC tX5nk&feature=player_detailpage https://www.youtube.com/watch?v=QdsxtC tX5nk&feature=player_detailpage

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

39 CREEP

40 Creep

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

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44 ARE MASS MOVEMENTS WEATHERING OR EROSION?

45 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

46 Causes of landslides ► https://www.youtube.com/watch?v=JrV4uC Vwmfk https://www.youtube.com/watch?v=JrV4uC Vwmfk https://www.youtube.com/watch?v=JrV4uC Vwmfk

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49 2015 Mass movements ear=2015 ear=2015

50 Laguna Beach 2005

51 Philippines Feb dead

52 Sleeping bear dunes 1995

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

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55 Prevention methods ► Leave enough space!

56 Prevention methods ► Leave enough space!

57 Prevention methods ► Plant vegetation ► Roots act as anchors

58 Prevention methods ► Provide good drainage- excellent way!

59 Prevention methods ► Provide good drainage


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