Classroom presentations Classroom presentations to accompany to accompany

Understanding EarthUnderstanding Earth, 3rd edition, 3rd edition

prepared byprepared by

Peter Copeland and William DupréPeter Copeland and William Dupré

University of HoustonUniversity of Houston

Chapter 11Chapter 11Mass Wasting

Influences on mass movementInfluences on mass movement

• Nature of slope materialsNature of slope materials

• Amount of waterAmount of water

• Angle of slopeAngle of slope

Classification of Mass Classification of Mass Movements: Movements: Table 11.2Table 11.2

Fig. 11.1a

Angle of Repose- Effect of Grain Angle of Repose- Effect of Grain SizeSize

Fig. 11.1b

Angle of Repose- Effect of Moisture Angle of Repose- Effect of Moisture ContentContent

Surface Surface TensionTension

Fig. 11.2

Fig. 11.3

Unsaturated Unsaturated SoilSoil

Saturated Saturated SoilSoil

Fig. 11.4

How do they do that?

Kelly Mooney Photography/Corbis

Fig. 11.5

Fire increases the

susceptibility for erosion and

mass movement

Grant Meyer

Weathered Shale

Fig. 11.6Martin Miller

Landslide Induced by Poor Landslide Induced by Poor Construction TechniquesConstruction Techniques

Fig. 11.7

Landslide Near Landslide Near Anchorage, Alaska, Anchorage, Alaska, Caused by the 1964 Caused by the 1964

EarthquakeEarthquake

Fig. 11.7

Factors that Influence Factors that Influence Mass Movements: Table 11.1Mass Movements: Table 11.1

Classification of mass Classification of mass movementsmovements

• RockfallRockfall

• RockslideRockslide

• Rock avalancheRock avalanche

• CreepCreep

• EarthflowEarthflow

• Debris flowDebris flow

• Mudflow Mudflow

• Debris avalancheDebris avalanche

• SlumpSlump

• Debris slideDebris slide

• SolifluctionSolifluction

Rockfalls

E.R. Degginger

Fig. 11.8

Rockslide

Fig. 11.9Jeff Foott/DRK

Rock avalanche

Brian Vikander/CorbisFig. 11.10

Soil CreepSoil Creep

Fig. 11.11

Fig. 11.11

Soil CreepSoil Creep

Fig. 11.12

Earthflow

Steve McCutcheon/Visuals Unlimited

Debris flow

Fig. 11.13E. R. Degginger

Mudflow

Fig. 11.14Vlastimir Shone/Gamma

Debris avalanche

Fig. 11.15 Russ Davies/The Image Bank

Slump

E. R. Degginger Fig. 11.16

Debris slide

Michael CollierFig. 11.17

SolifluctionSolifluction

Fig. 11.18

Solifluction

Fig. 11.18Fletcher & Baylis

Gros Ventre Landslide

A.J. Copley/Visuals Unlimited

Causes of slidesCauses of slides

• Heavy rain or snowfallHeavy rain or snowfall

• Excavation Excavation

• EarthquakesEarthquakes

Fig. 11.20

1925 Gros Ventre Slide1925 Gros Ventre Slide

Evolution of River Valley Dammed Evolution of River Valley Dammed by Landslideby Landslide

Fig. 11.21a

Before Slide

Evolution of River Valley Dammed Evolution of River Valley Dammed by Landslideby Landslide

Fig. 11.21b

After Slide

Evolution of River Valley Dammed Evolution of River Valley Dammed by Landslideby Landslide

Fig. 11.21cAfter Dam is Breached

Vaiont Dam Reservoir LandslideVaiont Dam Reservoir Landslide

Fig.11.22