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2009 Portland GSA Annual Meeting (18-21 October 2009)

Paper No. 5
Presentation Time: 9:00 AM-6:00 PM

CHARACTERIZATION OF GRAIN SIZES IN THE RESERVOIR IMPOUNDMENT BEHIND MARMOT DAM POST-DAM REMOVAL


DI LEONARDO, Diana, Geology, Hamilton College, 198 College HIll Rd Box 443, Clinton, NY 13323, PODOLAK, Charles J., Department of Geography and Environmental Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 and WILCOCK, Peter, National Center for Earth-surface Dynamics, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, ddileona@hamilton.edu

Marmot Dam was built in 1913 and stood until 2007 to divert water from the Sandy River to the Bull Run Hydroelectric Plant. During that time Marmot Dam impounded a reservoir deposit of approximately 750,000 m3 of sediment. Prior to dam removal Squier Associates completed a series of sediment cores and bulk samples to estimate the composition of the deposit (Stillwater 2000). Since 2007 the Sandy River has carved a path through the reservoir leaving vertical sections of the deposit exposed. This study aims to use these remains of the deposit to make another estimate of its composition using pebble counts and a bulk sample. It serves as a back of the envelope double check of the Squier Associates study and an experiment with a new sampling method. Our results suggest that the deposit may be coarser than previously thought.

Session No. 38--Booth# 311

T13. Hydrogeomorphic and Ecohydrologic Consequences of Extraordinary Sediment Loading (Posters)
Sunday, 18 October 2009: 9:00 AM-6:00 PM
Hall A (Oregon Convention Center)
Geological Society of America Abstracts with Programs. Vol. 41, No. 7, p.133
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