mass wasting & subsidence week 5. questions for discussion would you live on a slope or area...

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Mass Wasting & Subsidence Week 5

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Page 1: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Mass Wasting & SubsidenceMass Wasting & Subsidence

Week 5Week 5

Page 2: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

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?

Page 3: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

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

Page 4: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

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

Page 5: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Structural damage Surface disruption

Structural damage Surface disruption

Impact of Mass Movements

Impact of Mass Movements

Page 6: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

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

Page 7: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Slope Movement TriggersSlope Movement Triggers

Rainfall Vibration Undermining Loading

Rainfall Vibration Undermining Loading

Page 8: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Types of Slope

Failures

Types of Slope

Failures Slides Flows Falls Creep Avalanche

Slides Flows Falls Creep Avalanche

Page 9: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

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

Page 10: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Subsidence Causes

Subsidence Causes

Cave Collapse Groundwater loss Expandable soils Mining Tectonic movement

Cave Collapse Groundwater loss Expandable soils Mining Tectonic movement

Page 11: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

SinkholeSinkhole

Page 12: Mass Wasting & Subsidence Week 5. Questions for Discussion Would you live on a slope or area prone to subsidence? If so, where? What level of risk from

Addressing SubsidenceAddressing Subsidence Identification & mapping Planned subsidence Insurance

Identification & mapping Planned subsidence Insurance

Karst Prone Areas

Potentially Undermined Areas