Sediment Oxygen Demand in the Tualatin River Basin, Oregon, 1992-96Entry ID: WRIR_97_4103
Abstract: Sediment oxygen demand (SOD) rates were measured by U.S. Geological Survey (USGS) personnel at 20 stream sites in the Tualatin River Basin from 1992 through 1996 as part of an investigation into the sources and sinks of dissolved oxygen in the Tualatin River. During the low-flow summer periods of 1992 through 1994, 97 measurements were collected at 9 sites on the main stem of the river between ... river miles (RMs) 5.5 and 43.2. During the low-flow summer periods of 1995 and 1996, 28 measurements of SOD were collected at 11 sites on 8 tributaries of the Tualatin River. All SOD rates were measured with in-situ benthic chambers designed to monitor the loss of dissolved oxygen in a known volume of water circulating above a known area of minimally disturbed stream sediment.
For main-stem Tualatin River sites, the observed SOD rate ranged from 0.6 to 4.4 grams of oxygen per square meter per day (g/m 2 d) with a median of 2.3 g/m 2 d. In the tributaries, the measured SOD rate ranged from 0.2 to 10.9 with a median of 3.6 g/m 2 d. These rates are in the range of those reported for other sites in Oregon and across the United States. Most of the variation in the measured SOD rates was likely due to heterogeneities in the bed sediment.
Statistical comparisons show that the rates measured at the tributary sites are significantly larger than those measured in the main stem. Within the main stem, the rates measured at sites in the meander reach of the river were not significantly different from those measured in the reservoir reach. Similarly, no difference was found when the sites affected by the cycle of phytoplankton bloom and die-off were compared to those unaffected by phytoplankton. Only one site on the main stem, RM 5.5, was found to have an SOD rate that was significantly higher than that found at the other main-stem sites. Algal detritus may contribute to the elevated rate at that site, but other factors such as the rate of sediment accumulation could also account for the increased rate.
Data Set Citation
Dataset Originator/Creator: Stewart A. Rounds and Micelis C. Doyle
Dataset Title: Sediment Oxygen Demand in the Tualatin River Basin, Oregon, 1992-96
Dataset Release Place: Portland, Oregon
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: databaseOnline Resource: https://or.water.usgs.gov/pubs_dir/Html/WRIR97-4103/contents.html
Start Date: 1992-01-01Stop Date: 1996-01-01
BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > RIVERS/STREAM
BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > RIVERS/STREAM > TUALATIN RIVER BASIN
HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > CONTAMINANT LEVELS/SPILLS
HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > EUTROPHICATION
TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > RIVERS/STREAMS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CONTAMINANTS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > DISSOLVED GASES
Quality All of the SOD rates measured by USGS personnel in the Tualatin River Basin
from 1992 through 1996 are shown both in table 1 and figure 5. Ninety-seven
rates were measured at nine main-stem sites from 1992 through 1994.
Twenty-eight rates were measured at 11 tributary sites from 1995 through 1996.
All of the measurements were ... made during the May through October low-flow
period, with a slight emphasis on the month of September, which is a critical
period for DO in the main-stem river. During each measurement, the amount of
oxygen in the chamber was not a limiting factor. The lowest initial and final
DO concentrations encountered were 4.9 and 3.9 mg/L, respectively. Most of the
measurements, however, were performed with DO concentrations well above 6.0
Access Constraints None
Use Constraints None
Data Set Progress
Role: TECHNICAL CONTACT
Phone: (503) 251-3280
Fax: (503) 251-3470
Email: sarounds at usgs.gov
U.S. Geological Survey 10615 SE Cherry Blossom Dr.
Province or State: Oregon
Postal Code: 97216
Stewart A. Rounds and Micelis C. Doyle Sediment Oxygen Demand in the Tualatin
River Basin, Oregon, 1992-96. U.S. Geological Survey Water Resources
Investigations Report 97-4103.
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Creation and Review Dates
DIF Creation Date: 2001-06-27
Last DIF Revision Date: 2017-08-24
Future DIF Review Date: 2002-06-27