HR: 0800h
AN: H11F-0364    [Abstracts]
TI: Spatial and Temporal Variability of Hydraulic Properties in the Russian River Streambed, Central Sonoma, County, CA
AU: LaForce, M
EM: laforce@sfsu.edu
AF: San Francisco State University, 1600 Holloway Ave, TH 509, SF, Ca 94132 United States
AU: * Gorman, P
EM: peterdgorman@yahoo.com
AF: San Francisco State University, 1600 Holloway Ave, TH 509, SF, Ca 94132 United States
AU: Constantz, J
EM: jconstan@usgs.gov
AF: United States Geologic Survey, 345 Middlefield Road, Menlo Park, Ca 94025 United States
AB: Temporal and spatial variations of flux and vertical hydraulic conductivity were measured in the Russian River streambed in Sonoma County, California. In-situ vertical hydraulic conductivity measurements were made using a modified seepage meter, equipped with mini-piezometers and sediment was collected with a bucket and shovel. We sampled three different streambed (near bank, midpoint, and thalweg) locations at five different sample locales throughout the river system. Vertical hydraulic conductivity of the streambed ranged from 8.55X10$^{-5}$ cm/sec to 1.52X10$^{-1}$ cm/sec. Flux varied from -240 to 600 cm/day, which indicates both gaining and losing reaches of the stream occur in our study area. There was not a strong correlation (r=0.08) between particle size distribution and vertical hydraulic conductivity. Our findings will assist the Sonoma County Water Agency in managing water needs for the citizens of Sonoma County.
DE: 1829 Groundwater hydrology
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting