HR: 0830h
AN: H51C-1071    [PDF]
TI: Modeling Streambed Heating in Shallow Streams
AU: * Annear, R L
EM: annearr@cecs.pdx.edu
AF: Portland State University, Dept. of Civil and Environmental Engineering, P.O. Box 751, Portland, OR 97207-0751 United States
AU: Wells, S A
EM: scott@cecs.pdx.edu
AF: Portland State University, Dept. of Civil and Environmental Engineering, P.O. Box 751, Portland, OR 97207-0751 United States
AB: The Oregon Department of Environmental Quality is moving forward to develop TMDLs to address water quality concerns and threatened and endangered species habitat requirements in water bodies throughout Oregon. Approximately 940 water body segments are listed as water quality limited for stream temperature. CE-QUAL-W2 Version 3 is a two-dimensional water quality and hydrodynamic model capable of modeling watersheds with interconnected rivers, reservoirs and estuaries and accounts for the impact of riparian vegetative and topographic shading on stream temperature. One important aspect of modeling stream temperature is how to model the short-wave solar radiation that penetrates the water surface and impacts the channel bed or substrate, which can significantly affect temperature predictions under low-flow stream conditions. Algorithms were added to CE-QULA-W2 incorporating dynamic vegetative and topographic stream-side shading and dynamic three-dimensional streambed heating. The Bull Run River-Reservoir system is a 264 km2 watershed located 41.8 km east of downtown Portland serves as the city's primary drinking water source. The watershed consists of two reservoirs, Bull Run Lake and river sections above and below the reservoirs. Fieldwork was conducted in the Bull Run River during the summer of 2002 to monitor streambed temperatures, meteorological conditions, and stream temperatures.
DE: 1860 Runoff and streamflow
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: 2003 Fall Meeting