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Mass Wasting & SubsidenceMass Wasting & Subsidence
Week 5Week 5
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Questions for DiscussionQuestions for Discussion
Would you live on a slope or area prone to subsidence? If so, where?
What level of risk from mass wasting or subsidence is acceptable to you? (How would you know if the slope risk was assessed accurately?)
What should be done by people and communities in areas prone to slope failure and subsidence to prepare for the hazard and prevent catastrophe?
Would you live on a slope or area prone to subsidence? If so, where?
What level of risk from mass wasting or subsidence is acceptable to you? (How would you know if the slope risk was assessed accurately?)
What should be done by people and communities in areas prone to slope failure and subsidence to prepare for the hazard and prevent catastrophe?
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Other Questions to ConsiderOther Questions to Consider
What factors impact the stability of a slope?
What areas are prone to subsidence? (natural or human-induced)
The five concepts form Chapter 1
What factors impact the stability of a slope?
What areas are prone to subsidence? (natural or human-induced)
The five concepts form Chapter 1
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Mass MovementsMass Movements Mass Wasting
Down slope movement of earth materials
Caused by gravity Subsidence
Vertical movement Caused by loss of support
Mass Wasting Down slope movement of earth
materials Caused by gravity
Subsidence Vertical movement Caused by loss of support
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Structural damage Surface disruption
Structural damage Surface disruption
Impact of Mass Movements
Impact of Mass Movements
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Slope FactorsSlope Factors Angle of slope Water content Material composition Material orientation Vegetation Loading Undercutting Weathering of materials
Angle of slope Water content Material composition Material orientation Vegetation Loading Undercutting Weathering of materials
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Slope Movement TriggersSlope Movement Triggers
Rainfall Vibration Undermining Loading
Rainfall Vibration Undermining Loading
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Types of Slope
Failures
Types of Slope
Failures Slides Flows Falls Creep Avalanche
Slides Flows Falls Creep Avalanche
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Addressing Unstable Slopes
Addressing Unstable Slopes
Identification & mapping Slope monitoring Stabilization
vegetation water removal structural controls
Identification & mapping Slope monitoring Stabilization
vegetation water removal structural controls
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Subsidence Causes
Subsidence Causes
Cave Collapse Groundwater loss Expandable soils Mining Tectonic movement
Cave Collapse Groundwater loss Expandable soils Mining Tectonic movement
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SinkholeSinkhole
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Addressing SubsidenceAddressing Subsidence Identification & mapping Planned subsidence Insurance
Identification & mapping Planned subsidence Insurance
Karst Prone Areas
Potentially Undermined Areas