A multi-scale approach to understanding desert piedmonts using cosmogenic isotopes and centimeter-scale surveying Kyle Nichols Department of Geology.

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Presentation transcript:

A multi-scale approach to understanding desert piedmonts using cosmogenic isotopes and centimeter-scale surveying Kyle Nichols Department of Geology

Approach Short-term (50 yrs.) maps Long-term (10 3 to 10 4 yrs.) isotopes Small-scale (m) Large-scale (km) N/A 12 3

Global Positioning Systems (GPS; left) Accelerator Mass Spectrometery (AMS; top)

Desert Training Center 1942 to 1944 Over 1,000,000 men Over 1,000,000 men 12 base camps 12 base camps Size of Vermont Size of Vermont

Why use Iron Mountain? 2 years channel alteration (Army tanks, marching soldiers, etc.) No significant disturbance since Discrete time-frame of channel response to intense use (1944 to present). Ability to survey channels on the centimeter scale using differential Global Positioning System.

Centimeter-scale topographic mapping 6 Control Plots - representative of piedmont channels outside of Camp Iron Mountain 6 Walkway Plots - representative of piedmont channels forming in areas of intense foot trafficked areas 6 Road Plots - representative of piedmont channels forming down- gradient of road berms

Control Area

Typical Walkway Area

Typical Road Area

Channel orientations Control Plots Walkway Plots Road Plots