Meeting/Event Information

December Luncheon - The Legacy of Extreme Hydrologic Alteration in the Diamond Fork Watershed, Central Utah

December 04, 2018
11:30 AM to 1:00 PM
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Radisson Hotel Roseville
2540 North Cleveland Avenue
Roseville, MN 55113
http://www.radisson.com/roseville-hotel-mn-55113/mnroserd
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Registration for the AIPG MN Section December Luncheon is now open online! The cost is $21 for non-members and $16 for members when registering before Monday, December 3, 2018 at 11:00 AM. Students may attend free of charge by registering in advance. Same-day luncheon registration cost is $25.  As always, non-members and non-geologists are welcome to attend! Walk-ins are also welcome - we typically have about 10 spaces available.

 

THE LEGACY OF EXTREME HYDROLOGIC ALTERATION IN THE DIAMOND FORK WATERSHED, CENTRAL UTAH

by Jabari Jones, University of Minnesota Department of Earth Sciences

 

Presentation Abstract

Few cases of hydrologic augmentation are as extreme and well constrained as the Diamond Fork River, Utah. Beginning in 1915, the Diamond Fork and a headwater tributary, Sixth Water Creek, were used to convey trans-basin flows far in excess of the natural flow regime. At the outlet of Diamond Fork, daily summer flows regularly exceeded the 10 year flood. Augmented flows in the headwaters of Sixth Water were unprecedented, substantially exceeding the 500 year flood. Augmented flows were drastically reduced throughout the rest of Sixth Water and Diamond Fork in 2004 when a pipeline was completed to convey irrigation flows.

We analyzed the evolution of Sixth Water and Diamond Fork through the use of historical aerial imagery, airborne LIDAR, streambed elevation reconstructions, and RFID tagged gravels (and many other methods). Results indicate that present-day valley and channel morphology are a product of both long term augmentation and extreme events. Long term trans-basin diversions caused several meters of erosion in the bedrock valley of Sixth Water and considerably widened the channel in alluvial reaches. Floods in 1952 and 1983/84 delivered large pulses of sediment and over-widened the channel to the valley margins in alluvial reaches. Flow reductions in 2004 initiated a period of recovery as vegetation encroached on formerly active channel deposits and the channel narrowed. The present-day flow regime is not able to mobilize bed material at common flows due to bed armoring during the period of augmented flows. As a result, the present-day channel is relatively inactive with large deposits of former active channel material in the valley. The geomorphic history of Diamond Fork has a strong influence on riverine ecology, and any restoration activities in the watershed must consider the legacy of hydrological disturbance.

 

Speaker Biography

Jabari Jones is a PhD student in the Department of Earth Sciences at the University of Minnesota. His research attempts to understand how and why rivers change in response to changing hydrology and sediment supply, especially as a result of human activity. Originally from Minneapolis, Jabari has a strong research interest in the Upper Midwest and is interested in promoting and increasing diversity in the geosciences. Prior to attending the University of Minnesota, Jabari received a B.A. in Geology from Carleton College and a M.S. in Watershed Sciences from Utah State University.

Tickets

$16.00 AIPG Member

$21.00 Non-Member

$0.00 Student

$250.00 2019 AIPG Minnesota Section Sponsorship!

$0.00 Donation to Education Fund