Landslides - PowerPoint PPT Presentation

1 / 12
About This Presentation
Title:

Landslides

Description:

Lands. Geology 2022: Natural Disasters. Department of ... Lands. a) ... Lands. a) Internal Causes. ii) Pore water pressure. iii) ... – PowerPoint PPT presentation

Number of Views:65
Avg rating:3.0/5.0
Slides: 13
Provided by: gregf8
Category:

less

Transcript and Presenter's Notes

Title: Landslides


1
Landslides
  • Geology 2022 Natural Disasters
  • Department of Geography Geology
  • Nipissing University
  • Autumn 2007

2
Review Debris Flows Avalanches
  • a) Slopes as hazards
  • b) Slope Failures
  • c) Classification
  • (see figs. 10.16 10.17)

3
Review Debris Flows Avalanches
  • d) Debris Flows
  • e) Snow Avalanches

4
Introduction Landslides
  • a) Defn
  • A mass of unconsolidated earthen material
    sliding down an identifiable sliding plane
  • b) Slope Failure
  • i) Gravity
  • ii) Conditional Stability
  • iii) Causes Triggers
  • (internal external)

5
Introduction Landslides
  • c) Importance
  • i) Economic Losses
  • ii) Human Losses
  • d) In Canada
  • i) Canada Landslide Project
  • (http//gsc.nrcan.gc.ca/landslides)

6
Causes
  • a) Internal Causes
  • i) Weak materials
  • (see fig 10.7)

7
Landslides
  • a) Internal Causes
  • ii) Pore water pressure
  • iii) Decreases in cohesion
  • iv) Geologic structure
  • (e.g. dipslopes see fig 10.12a)

8
Landslides
  • b) External Causes
  • i) Slope steepening
  • ii) Removal of support
  • iii) Adding mass
  • iv) Degradation
  • (e.g. deforestation)

9
Landslides
  • c) Triggers
  • i) Precipitation Events
  • (NB. intensity duration)
  • ii) Undercutting
  • iii) Seismic Activity
  • iv) Volcanic Activity
  • iv) Human Activity

10
Landslides
  • d) Types
  • i) Rotational
  • (see fig 10.6 a b)

11
Landslides
  • d) Types
  • ii) Translational
  • (see fig 10.25)

12
Management
  • a) Land-use Planning Management
  • b) Conservation Practices
  • c) Co-ordinated Remedial Measures
  • d) Monitoring
  • e) Early Warning Systems
  • f) Research
Write a Comment
User Comments (0)
About PowerShow.com