Lecture12_massmvt - MASS MOVEMENTS GEO 1111 Introduction to...

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1 MASS MOVEMENTS GEO 1111 – Introduction to Earth Systems Lecture 12
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2 Key terms mass movements (syn.: mass wasting – Tarbuck) driving force and resisting force internal strength angle of repose fall vs slide vs flow ckfall and debris fall rockfall and debris fall rockslide, slump, and debris slide GEO 1111 – Introduction to Earth Systems Lecture 12 creep, gelifluction, debris flow, mudflow (lahars), quickclays, and avalanches
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3 Outline What is mass movement? Today: What makes a slope fail? 1. What is mass movement? 2. Why study mass movements? 3. What makes a slope fail? 4. How does material move downslope? (classification of mass mvt) GEO 1111 – Introduction to Earth Systems Lecture 12
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4 What is mass movement? Plate tectonics topography Main driving force Relief planed out article motion e by one OR under certain conditions Erosion agents: Processes: weathering, erosion, etc. Particle motion one by one OR, under certain conditions, can also move 'en masse‘. Mt. Yamnuska Mass movement (def): movement in which bedrock, rock debris, GEO 1111 – Introduction to Earth Systems Lecture 12 or soil move downslope in bulk because of gravity .
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5 Why study mass movements? Landslides (one type of mass mvt) are Canada's most destructive natural hazard. In Canada, landslides cause between $100 – 200 million in damage annually, and have caused > 600 deaths since 1840. Better understanding of the geology, and the risk factors can limit the damage and save lives. GEO 1111 – Introduction to Earth Systems Lecture 12
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6 pril 2008 - acuation on rue Lafrance Gatineau Why study mass movements? April 2008 evacuation on rue Lafrance, Gatineau Maybe if some of these house owners had taken GEO1111 GEO 1111 – Introduction to Earth Systems Lecture 12 they wouldn’t have built their homes at that location ??
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7 What makes a slope fail? orce analysis Force analysis DRIVING FORCE (F driv = mg sin θ ) RESISTING FORCE (F res = μ fric N = μ fric mg cos θ ) Two scenarios: 1) No motion; F driv < or = F res 2) Initiation of motion when; F driv > F res hen critical angle ( θ c) is exceeded) GEO 1111 – Introduction to Earth Systems Lecture 12 (when critical angle (
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8 What makes a slope fail? Force analysis – additional variables Force analysis Rock can move in one solid block ( slide ) as in the diagram of the previous slide, but rock debris and soil can also deform internally ( flow ) under the influence of gravity.
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Lecture12_massmvt - MASS MOVEMENTS GEO 1111 Introduction to...

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