UA Geoscience Symposium
April 12-14

Welcome to the 46th annual University of Arizona Geosciences Symposium ("Geodaze")



2018 Field Trip: USDA-ARS Walnut Gulch Experimental Watershed, Tombstone, AZ

8:00 AM - 5:00 PM, Saturday, April 14.

Kendall grass-dominated watershed
Kendall grass-dominated watershed. Runoff data from shrub- vs. grass-dominated watersheds is used to assess interactions between rainfall intensity, soils, and vegetation. These results contribute to flood frequency analyses, water yield estimations, and the validation of hydrologic and sediment yield models.

Earth's surface is a valuable record of past changes in climate. This record can be studied to infer how Earth's systems may respond to ongoing and future climate change. Understanding the influence of changing climate on systems affecting critical issues, such as the frequency and severity of flooding, soil productivity and sustainability, or natural and anthropogenic erosion rates, requires long-term measurement of the processes currently shaping Earth's surface. Since the mid-1950s, the Walnut Gulch Experimental Watershed (WGEW) has operated as an outdoor laboratory in support of the mission of the USDA-ARS Southwest Watershed Research Center to develop knowledge and technology to conserve water and soil in semi-arid lands. The WGEW is located within the upper San Pedro River Basin and is intensively instrumented for studying s'mi-arid rangeland hydrologic, ecosystem, climate, and erosion processes. Multi-decadal measurements of rainfall, runoff, and erosion comprise a world-renowned database of the hydrology and evolution of semi-arid lands and make the WGEW the leading semi-arid research watershed in the world. Collaboration with local landowners and ranchers, universities, and state, federal and international scientists and agencies has resulted in over 1,500 manuscripts and numerous computer simulation models, which contribute to developing knowledge and technology to conserve water and soil in semi-arid environments globally.

Registration and other details

Register to join us for the annual GeoDaze field-trip from 8:00 AM - 5:00 PM, Saturday, April 14. Non-U.S. citizens are reminded to bring their passport and/or documentation of student or immigration status as US Border Patrol operates routine checkpoints in the area.

Please arrive at the Gould-Simpson loading dock (North side) on 4th St. by 8:15. Our scheduled return is 5:00 PM.

Sites within the WGEW are readily accessible by vehicle. Participants, however, should be prepared for uneven terrain, thorny vegetation, and gentle slopes. Lunch will be provided for registered participants, but please bring sufficient water.

Walnut Gulch Supercritical flow flume. Walnut Gulch Supercritical flow flume. Nearly a dozen flumes operate in watersheds within the WGEW to measure runoff from the heavily sediment laden ephemeral streams. The largest flume, shown here, at the outlet of the Walnut Gulch Experimental Watershed has a flow capacity of 650 cubic meters/sec.

Rainfall simulator experiment Rainfall simulator experiment. Rainfall simulator experiments are being conducted to quantify the relationships between, rainfall, runoff, and sediment yield in response to changes in the density and type of vegetation.



If you have any questions or comments regarding the 2018 Geosciences Symposium please e-mail us.