Modeling Water Quality in the Tualatin River, Oregon, 1991-1997

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Stewart A. Rounds and Tamara M. Wood
Publication_Date: 2001
Title: Modeling Water Quality in the Tualatin River, Oregon, 1991-1997
Edition:
Geospatial_Data_Presentation_Form: database
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place: Portland, Oregon
Publisher: U.S. Geological Survey
Other_Citation_Details:
Online_Linkage:
Description:
Abstract:
The calibration of a model of flow, temperature, and water quality in the Tualatin River, Oregon, originally calibrated for the summers of 1991 through 1993, was extended to the summers of 1991 through 1997. The model is now calibrated for a total period of 42 months during the May through October periods of 7 hydrologically distinct years. Based on a modified version of the U.S. Army Corps of Engineers model CE-QUAL-W2, this model provides a good fit to the measured data for streamflow, water temperature, and water quality constituents such as chloride, ammonia, nitrate, total phosphorus, orthophosphate, phytoplankton, and dissolved oxygen. In particular, the model simulates ammonia concentrations and the effects of instream ammonia nitrification very well, which is critical to ongoing efforts to revise ammonia regulations for the Tualatin River. In addition, the model simulates the timing, duration, and relative size of algal blooms with sufficient accuracy to provide important insights for regulators and managers of this river. Efforts to limit the size of algal blooms through phosphorus control measures are apparent in the model simulations, which show this limitation on algal growth. Such measures are largely responsible for avoiding violations of the State of Oregon maximum pH standard of 8.5 in recent years, but they have not yet reduced algal biomass levels below the State of Oregon nuisance phytoplankton growth guideline of 15 5g/L chlorophyll-a. Most of the dynamics of the instream dissolved oxygen concentrations are captured by the model. About half of the error in the simulated dissolved oxygen concentrations is directly attributable to error in the size of the simulated phytoplankton population. To achieve greater accuracy in simulating dissolved oxygen, therefore, it will be necessary to increase accuracy in the simulation of Tualatin River phytoplankton. Future efforts may include the introduction of multiple algal groups in the model. This model of the Tualatin River continues to be used as a quantitative tool to aid in the management of this important resource. The calibration of a model of flow, temperature, and water quality in the Tualatin River, Oregon, originally calibrated for the summers of 1991 through 1993, was extended to the summers of 1991 through 1997. The model is now calibrated for a total period of 42 months during the May through October periods of 7 hydrologically distinct years. Based on a modified version of the U.S. Army Corps of Engineers model CE-QUAL-W2, this model provides a good fit to the measured data for streamflow, water temperature, and water quality constituents such as chloride, ammonia, nitrate, total phosphorus, orthophosphate, phytoplankton, and dissolved oxygen. In particular, the model simulates ammonia concentrations and the effects of instream ammonia nitrification very well, which is critical to ongoing efforts to revise ammonia regulations for the Tualatin River. In addition, the model simulates the timing, duration, and relative size of algal blooms with sufficient accuracy to provide important insights for regulators and managers of this river. Efforts to limit the size of algal blooms through phosphorus control measures are apparent in the model simulations, which show this limitation on algal growth. Such measures are largely responsible for avoiding violations of the State of Oregon maximum pH standard of 8.5 in recent years, but they have not yet reduced algal biomass levels below the State of Oregon nuisance phytoplankton growth guideline of 15 5g/L chlorophyll-a. Most of the dynamics of the instream dissolved oxygen concentrations are captured by the model. About half of the error in the simulated dissolved oxygen concentrations is directly attributable to error in the size of the simulated phytoplankton population. To achieve greater accuracy in simulating dissolved oxygen, therefore, it will be necessary to increase accuracy in the simulation of Tualatin River phytoplankton. Future efforts may include the introduction of multiple algal groups in the model. This model of the Tualatin River continues to be used as a quantitative tool to aid in the management of this important resource. In order to retain the value of the USGS Tualatin River model as a management tool and build upon the knowledge gained from the original modeling study, the period of model calibration was expanded from the summers of 1991-1993 to include the summers of 1991-1997. As in the original application by Rounds and others (1999), this application of CE-QUAL-W2 modeled the Tualatin River from RM 38.4 (Rood Bridge) to RM 3.4 (Oswego dam), the reach with most of the water-quality problems. Both the Rock Creek WWTP and the Durham WWTP were included as tributary inputs. Ten other tributaries were simulated as point sources: Rock, Butternut, Christensen, Burris, Baker, McFee, Chicken, Rock (South), Fanno, and Nyberg Creeks. Of these, only Rock and Fanno Creeks contributed significant amounts of water to the model reach. Ground water and small ungauged tributaries were handled as a nonpoint source. The model grid used 155 segments and 16 layers; most segments were about 0.25 mile long and most layers were 2 feet deep. The details of the river bathymetry and the model grid were documented previously (Rounds and others, 1999). The ability of the model to simulate measured conditions was tested with four goodness-of-fit statistics: the root mean squared error (RMSE), the coefficient of determination (r2), the means absolute error (MAEA), and the mean of the relative absolute error (MRAE). The RMSE is defined as the square root of the mean of the squared difference between measured and simulated values. As such, the RMSE is similar to a standard deviation of the error; roughly two-thirds of the errors are expected to fall within +/-1 RMSE. Further information about the fit statistics can be obtained from Rounds, S.A. And Wood, T.M. 2001 Information for this metadata was obtained from the Technical Reports of the Oregon District available at http://oregon.usgs.gov/pubs_dir/online_list.html .
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Rounds, S.A. and Wood, T.M. U.S. Geological Survey, 2001, Modeling Water Quality in the Tualatin River, Oregon, 1991-1997 Water Resources Investigations Report, 01-4041 Portland, Oregon, U.S. Geological Survey. http://oregon.usgs.gov/pubs_dir/Pdf/01-4041.pdf
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910501
Ending_Date: 19971001
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.375
East_Bounding_Coordinate: -122.625
North_Bounding_Coordinate: 45.75
South_Bounding_Coordinate: 45.25
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > VEGETATION > CHLOROPHYLL
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > VEGETATION > NITROGEN > TOTAL NITROGEN
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > VEGETATION > NUTRIENTS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > VEGETATION > PHOSPHORUS > TOTAL PHOSPHORUS
Theme_Keyword: EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > CONTAMINANT LEVELS/SPILLS
Theme_Keyword: EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > EUTROPHICATION
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > RUNOFF
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > DISSOLVED GASES > DISSOLVED OXYGEN
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > DISSOLVED SOLIDS
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > NITROGEN COMPOUNDS
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > NUTRIENTS
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > OXYGEN > DISSOLVED OXYGEN
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > PHOSPHOROUS COMPOUNDS
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > TURBIDITY
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER TEMPERATURE
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA > CYANOBACTERIA (BLUE-GREEN ALGAE)
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > ALGAE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > RIVERS/STREAM HABITAT > TUALATIN RIVER, OREGON
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
Theme_Keyword: Model Application
Theme_Keyword: Nutrients
Theme_Keyword: Algae
Theme_Keyword: Dissolved Oxygen
Theme_Keyword: Ammonia
Theme_Keyword: Nitrate
Theme_Keyword: Total Phosphorus
Theme_Keyword: Orthophosphate
Theme_Keyword: Portland, Oregon
Theme_Keyword: Tualatin River Basin
Theme_Keyword: Coast Range Mountains
Theme_Keyword: Biological Data Profile
Theme_Keyword: Bdp
Theme_Keyword: BIOTA
Theme_Keyword: ENVIRONMENT
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > OREGON
Access_Constraints: None
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: STEWART A. ROUNDS
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: 10615 SE Cherry Blossom Dr.
City: Portland
State_or_Province: Oregon
Postal_Code: 97216
Country: USA
Contact_Voice_Telephone: (503) 251-3280
Contact_Facsimile_Telephone: (503) 251-3470
Contact_Electronic_Mail_Address: sarounds@usgs.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
As in the original application by Rounds and others (1999), this application of CE-QUAL-W2 modeled the Tualatin River from RM 38.4 (Rood Bridge) to RM 3.4 (Oswego Dam), the reach with most of the water-quality problems. Both Rock Creek WWTP (RM 38.1) adn the Durham WWTP (RM 9.3) were included as tributary inputs. Ten other tributaries were simulated as point sources: Rock, Butternut,Christensen, Burris, Baker, McFee, Chicken, Rock (South), Fanno, and Nyberg Creeks. Of these, only Rock and Fanno Creeks contributed significant amounts of water to the model reach. Ground water and small ungaged tributaries were handled as a nonpoint source. Complex water quality models such as CD-QUAL-W2 require many types of bondary data, calibration data, and meteorological data as well as rate data such as rates of algal growth and settling. The data used in this modeling study were collected by a variety of organizations for many purposes. Each of these data sets was quality-assured before use. The types and sources of most of the data used by the model are listed in table 1 of Rounds and Wood, 2001. These data are available upon request from the source agencies. During the 1991-1993 period of the original study, special efforts were made to obtain some of the more difficult-to-collect data such as algal primary productivity, light extinction coefficients, settling velocities and zooplankton abundances. Extra water quality samples also were collected during 1991-1993 to augment USA's routine monitoring program. The extra efforts during 1991-1993 result in more of some types of data being available for that period. For some locations, such as the WWTPs however, more water quality data are available for 1996 and 1997 than for any of the years from 1991-1995. The frequency of available discharge, water temperature, and water quality data for the relevant boundary or main-stem sites is documented in table 2 of of Rounds and Wood, 2001.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: DOI/USGS/WRD/OR > Water Resource Division, Oregon, U.S. Geological Survey, U.S. Department of the Interior
Contact_Person: DENNIS D. LYNCH
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: U.S. Geological Survey
Address: 10615 S.E. Cherry Blossom Drive
City: Portland
State_or_Province: Oregon
Postal_Code: 97216-3159
Country: USA
Contact_Voice_Telephone: (503) 251-3200
Contact_Facsimile_Telephone: (503) 251-3470
Contact_Electronic_Mail_Address: ddlynch@usgs.gov
Resource_Description: WRIR_01_4062
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://oregon.usgs.gov
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://mercury.ornl.gov/clearinghouse/send/xsltTex...
Access_Instructions:
Metadata in National Biological Information Infrastructure format.
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20010627
Metadata_Review_Date: 20121212
Metadata_Future_Review_Date: 20020627
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: TYLER B. STEVENS
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: (301) 614-6898
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Tyler.B.Stevens@nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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