unit 2 introductory presentation

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This work is supported by the National Science Foundation’s Transforming Undergraduate Education in STEM program within the Directorate for Education and Human Resources (DUE- 1245025). SURFACE PROCESS HAZARDS: UNIT 2 Sarah Hall, College of the Atlantic Becca Walker, Mt. San Antonio College

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Page 1: Unit 2 Introductory Presentation

This work is supported by the National Science Foundation’s Transforming Undergraduate Education in STEM program within the Directorate for Education and Human Resources (DUE-1245025).

SURFACE PROCESS HAZARDS: UNIT 2

Sarah Hall, College of the AtlanticBecca Walker, Mt. San Antonio College

Page 2: Unit 2 Introductory Presentation

GEOMORPHOLOGY

What does this word mean? Pull it apart:

GEO: Earth MORPH: form or shape

OLOGY: the study of

So “geomorphology” is the study of the shape of the earth: landscapes and land-shaping

processes.

Page 3: Unit 2 Introductory Presentation

SALT LAKE CITY, UT

Compare the “morphology” of the eastern and western portions of this map

Page 4: Unit 2 Introductory Presentation

GEOMORPHOLOGY

Take a minute to discuss with the person next to you: 1. What are some characteristics of

different landscapes? Take note of the vocabulary you are using to compare landscapes.

2. What are some common processes that form and re-shape landscapes?

Page 5: Unit 2 Introductory Presentation

WHAT’S THE DEFINITION OF RELIEF?

Relief: relief refers to the difference between the highest and lowest elevation in a given area. High relief areas are characterized by generally steep terrain while low-relief areas are generally flat with subdued topography. In high relief areas rivers tend to be fast moving and confined to narrow drainages while in low relief areas rivers tend to meander over wider floodplains.

Page 6: Unit 2 Introductory Presentation

RELIEF

“Total relief:”Difference between the highest and lowest elevation on a map.

Topographic Map of Mt. Desert Island (MDI) , ME

Cadillac Mountain: 1528’ a.m.s.l

Page 7: Unit 2 Introductory Presentation

RELIEF

“High relief” areas:Generally steep or high-slope areas where there are large changes in elevation over short distances.

Topographic Map of Mt. Desert Island (MDI) , ME

Page 8: Unit 2 Introductory Presentation

Contour lines are closely spaced on map, landscape features include steep valleys, shear cliffs, faster flowing streams, and exposed bedrock peaks.

“HIGH RELIEF” AREA ON MDI

Topographic Map of Mt. Desert Island, ME

View NE from Beech Cliffs

Page 9: Unit 2 Introductory Presentation

“HIGH RELIEF” LANDSCAPESMountainous topography, steep slopes, jagged peaks, shear cliffs, alpine glaciers

Kenai Peninsula, AK

Kenai Peninsula, AK

Cordillera Blanca, Peru

Cordillera Blanca, Peru

Cordillera Blanca, Peru

Page 10: Unit 2 Introductory Presentation

RELIEF

“Low Relief” Areas:Generally flat or low-slope areas where there is little change in elevation over long distances.

Topographic Map of Mt. Desert Island (MDI), ME

Page 11: Unit 2 Introductory Presentation

“LOW RELIEF” AREAS ON MDI

Contour lines are spread out indicating fairly flat topography, landscape features include wetlands, low hills, gently sloping beaches, slower flowing streams.

View SW from Seawall BeachTopographic Map of Mt. Desert Island, ME

Page 12: Unit 2 Introductory Presentation

“LOW RELIEF” LANDSCAPES

Flat topography, deserts, wetlands, lakes, big sky

Death Valley, CA

Atacama Desert, Peru

Southern Wyoming

Page 13: Unit 2 Introductory Presentation

LIDAR: LIGHT DETECTION AND RANGING“Hillshade image” of Mt. Desert Island generated from the lidar data digital elevation model (DEM)

Also check out: http://lidar.cr.usgs.gov/

LIDAR-based Hillshade Image of Mt. Desert Island (MDI), ME

Page 14: Unit 2 Introductory Presentation

LIDAR DATA ACQUISITION

Airborne

Ground-based

Page 15: Unit 2 Introductory Presentation

FINDING LANDSCAPE FEATURES IN DEM HILLSHADE IMAGESMt. St. Helens

Aerial Imagery Hillshade DEM Image

Page 16: Unit 2 Introductory Presentation

FINDING LANDSCAPE FEATURES IN DEM HILLSHADE IMAGESMt. St. Helens and surrounding area (lakes, rivers, etc.) Aerial Imagery

Hillshade DEM Image

Page 17: Unit 2 Introductory Presentation

ANNOTATED MAPS OF MT. ST. HELENSDrainage networks, lakes, ridges, floodplains, volcanoes

Aerial Image

Hillshade DEM

Landscape Features