Mass Movements Landslides aka Def movement of sediment

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

http: //www. youtube. com/watch? v=Qdsxt. C t. X 5 nk&feature=player_detailpage

ROCKFALL

Rockfall- boulders

ROCKSLIDE

I-40 North Carolina Nov. 2009 ► http: //www. youtube. com/watch? v=ZVYGJY n. JTi 0

AVALANCHE ► Fast movement of snow ► Caused by a weak layer of snow underneath surface ► Usually in Spring ► http: //www. youtube. c om/watch? v=B 0 RWLx OFGLY Avalanche Danger In Colorado At 30 Year High, Says Expert; 6 Fatalities So Far This Season

Snowbird, UT Nov. 2011 ► Jamie Pierre, here performing an extreme jump, was killed while snowboarding near Gad Valley on Sunday.

Telluride

documents/accidents/US_avalanche_ fatalities_by_user_group_by_year_1 997 -2 XXX. pdf

Mudflow/Lahar ► Mudflow- clay mixed with water ► Usually in spring- snowmelt ► Lahar- volcanic ash mixed with water

Mudflow Java 2007

► http: //www. youtube. com/watch_popup? v= VMJiibd. VYj. E&vq=small#t=34 http: //www. youtube. com/watch? v=VMJiibd VYj. E&feature=player_popout

Lahar MT ST HELENS

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

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 ► 2. ► 3. angle of slope lack of vegetation ► 4. rock type ► 5. Roundness of particle § More adds weight and makes slippery § Roots hold back movement § Sedimentary worst § Rounder move faster

Mass movements ► Cost US $4 billion per year ► http: //landslides. usgs. gov/recent/index. php ? year=2009&month=Oct

Landslide Causes? ► http: //www. youtube. com/watch? v=Jr. V 4 u. CV wmfk

Laguna Beach 2005

Philippines Feb. 2006 1800 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