Landscape Evolution GPH 111 What is landscape evolution
- Slides: 46
Landscape Evolution GPH 111
What is landscape evolution? w The overall topographic alteration of continental surfaces from their tectonic construction to their weathering, hillslope, fluvial, and other process driven erosion.
Landscape Evolution is Geomorphology
How do Weathering, Hillslope Processes, and Fluvial Systems interact to generate Landscape Evolution?
What would a landscape look like if WEATHERING rates were greater than the rate of HILLSLOPE transport? Discuss with your groups* *consider arid locations
A Transport Limited Landscape? Landscape Change Depends on the Rate of HILLSLOPE TRANSPORT! Like a supermarket with too many goods (spilling over) with not enough customers
What would a landscape look like if WEATHERING rates were less than the rate of HILLSLOPE transport? Discuss with your groups* *consider arid locations
A Weathering Limited Landscape? Landscape Change Depends on the Rate of WEATHERING! Any particles generated through weathering are easily transported to fluvial systems. Like a supermarket dependent on the arrival of goods with plenty of customers
What would a landscape look like if HILLSLOPE transport was less than the rate of FLUVIAL transport? Discuss with your groups* *consider arid locations
Pediments!!! Fluvial systems rapidly move hillslope sediment down system. Generates a planed bedrock surface around the mountain front covered by a thin veneer of alluvium.
Pediments!!! Fluvial systems rapidly move hillslope sediment down system. Generates a planed bedrock surface around the mountain front covered by a thin veneer of alluvium.
What would a landscape look like if HILLSLOPE transport was greater than the rate of FLUVIAL transport? Discuss with your groups* *consider arid locations
Alluvial Fans!!! Zones of hillslope deposits build a broad apron around the base of mountain fronts. Struggling fluvial systems utilize a secondary period of weathering to break down course sediment before further transport.
Alluvial Fans!!!
Now, let’s take a look at our generalized landscape model.
What is necessary for this landscape to be in equilibrium, where mountain elevation maintained overtime?
The mountains of New Zealand are an example, they have been at roughly the same elevation for 10 Ma.
What could cause hillslope transport to accelerate rapidly?
What could cause hillslope transport to accelerate rapidly?
A large earthquake generated these landslides in Alaska How might the landscape respond?
How would the geomorphic system respond if weathering rapidly decreased? What could cause this?
How would the geomorphic system respond if weathering rapidly decreased? What could cause this?
What might have occurred if deposition off the continent increased rapidly?
What might have occurred if deposition off the continent increased rapidly?
What might the significance be if one side of the mountain weathered more quickly than another? Would this be common?
Drainage divides retreat, and therefore mountain ranges persist while individual peaks are short lived.
Let’s go on a road trip to Race Track Playa…
Race Track Playa DEM…
Race Track Playa…
Race Track Playa…
Moki Marbles? ?
Krumholtz? ? ?
What else is in GEOMORPHOLOGY? Coastal Processes Aeolian Processes Glacier Processes
Glacier Processes
Glacier Processes Erosion…
Glacier Processes And Deposition…
Glacier Processes And Polishing…
Glacier Processes
Glacier Processes
Glacier Processes
Glacier Processes
Glacier Processes How do GLACIER PROCESSES affect the GEOMORPHIC SYSTEM?
Glacier Processes
Glacier Processes
Things to Know: w What is LANDSCAPE EVOLUTION? EVOLUTION w KNOW THE GEOMORPHIC SYSTEM DIAGRAM? w How do weathering, hillslope processes, and fluvial processes interact with each other to generate weathering limited landscapes, transport limited landscapes, pediments, and alluvial fans in arid climates. w How do landscapes respond to climate change, earthquakes, wildfires, drainage divide retreat. . . ? w How do glaciers interact with landscape evolution? Help: Ask Dr. Douglass