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UD - GEOL 105 - Geology 105 Study Guide - Study Guide

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UD - GEOL 105 - Geology 105 Study Guide - Study Guide

School: University of Delaware
Department: Science
Course: Geological Hazards and Their Human Impact
Professor: Edward Kohut
Term: Spring 2016
Tags: Geology, Science, and Hazards
Name: Geology 105 Study Guide
Description: These notes cover information for exam 2
Uploaded: 03/10/2016
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background image Geology 105 Study Guide  The Water Cycle Part of the weather process, influenced by climate. It is the  transfer of water between oceans, atmosphere, surface water on land 
and ground water. 
Stream Types Bedrock Streams:  - Steep in terrain 
- Little sediment or alluvial lining channel bed
Alluvial Streams: - Gently sloping terrain 
- Carry fine silt and sand
- Wide Valleys with flat flood plains 
Floods Downstream Floods:  - Excess water spills into flood plains
- May take hours or days to develop
- Caused by high amounts of precipitation 
over an extended period in a large drainage 
basin
Flood Recurrence Interval: - Flood magnitude or size can be measured  by discharge or stage  - The larger the flood magnitude, the greater  the recurrence interval  - Calculated by R = N+1/M Mitigation Methods: - Flood Control
- Levees
- Flood walls
- Dams
Flooding Examples:  - Mississippi and Missouri River floods in 1993
- 30,000 Square miles flooded
- 50 lives lost and $20 billion in damage
- Precipitation between 400% - 750% above 
average  Big Thompson Canyon Flood of 1976
background image - Stationary thunderstorm dumps 300  millimeters of rain over upper Canyon in 
less than four hours
- 143 people killed Mass Wasting: -Driven by gravity
- Also called mass movements
- Most commonly called landslides
- Costs about $1-3 billion dollars or damage a 
year Types of mass movement: - Falls: Involve a drop through air and is the  fastest type of mass movement  - Slides/ Slumps: Cohesive movement along  slide plane - Flows: Material moves chaotically like a fluid  Debris Flows: - Also called debris avalanche
- Very rapid
- Chaotic flow of unconsolidated rock, soil, 
vegetation and water Earthflows: - Fairly on dry soil
- Usually not as rapid as debris flows
Mudflows:  - Saturated soil produces mudflows 
- Volcanic lahars are a special case of mud flows
Creep: - Slowest type of flow
- Driven by thawing and freezing
- Long term weakening of foundations 
Mass Movement Dynamics: - Mass on a slope is kept in place by balance of  forces - Any change in force may destabilize the mass  and allow movement. Flow Dynamics: - Stable slope of loose particles is the angle of  repose - Resisting force is friction between particles 
- Amount of water may increase or decrease 
slope

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School: University of Delaware
Department: Science
Course: Geological Hazards and Their Human Impact
Professor: Edward Kohut
Term: Spring 2016
Tags: Geology, Science, and Hazards
Name: Geology 105 Study Guide
Description: These notes cover information for exam 2
Uploaded: 03/10/2016
3 Pages 83 Views 66 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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