Slope_processes_1

Slope_processes_1 - • Triggered by earthquake • 28...

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Slope Processes and Mass Wasting Kelso, WA (1999)
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Slope processes play important role in erosion and transport of sediment to stream systems
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Slope Materials Bedrock Soil Unconsolidated material
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Coast Range, CA Monument Valley Character of slopes depends on rock type and climate Resistant sandstone Weak shale High rainfall; weak rock Low rainfall
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Talus slope Cliff face
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Movement Materials Type Rock Soil Slides Slump Slump Rockslide Soil slip Falls Rock fall Soil fall ? Flows Slow Rock creep Soil creep Unconsolidated materials Rapid Earthflow Mudflow Debris flow Most rapid Debris avalanche Complex (combination of slide and flow) Classification of Downslope Movement Types of movement
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Rockslide Slide surface Slide material usually becomes disaggregated
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Rockslide at Frank, Alberta (1903) Slide debris extended 1.5 miles 76 recorded fatalities; ¾’s of all buildings in Frank buried by slide material
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Madison Canyon Slide, Montana (1959)
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Unformatted text preview: • Triggered by earthquake • 28 fatalities (in campground below slide) • slide debris dammed river creating lake Slump (rotational slide) Slump block Slump and Earthflow at La Conchita, CA (1995) Earthflow Head scarp Slump Scarps Slumping is common along steep river banks Soil slips (usually shallow depth) Debris slide and debris flow triggered by earthquake in Taiwan Debris apron Slide debris has diverted river Death Valley Mudflows may also occur in arid regions associated with “flash floods” Apron Freezing-thawing or wetting-drying cycles cause soil to repeatedly expand and contract. Result is slow “creep” of soil downslope. Soil Creep Characteristic indicators of soil creep Some indicators of soil creep Tilted fence posts Bent bedrock strata Curved tree bases on a hill slope are indicator of soil creep...
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This note was uploaded on 05/13/2011 for the course GEO 101 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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Slope_processes_1 - • Triggered by earthquake • 28...

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