Data Collection Methods, Quality Assurance Data, and Site Considerationsfor Total Dissolved Gas Monitoring, Lower Columbia River, Oregon and Washington, 2000.

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Dwight Q. Tanner and Matthew W. Johnson
Publication_Date: 2001
Title: Data Collection Methods, Quality Assurance Data, and Site Considerationsfor Total Dissolved Gas Monitoring, Lower Columbia River, Oregon and Washington, 2000.
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:
Excessive total dissolved gas pressure can cause gas-bubble trauma in fish downstream from dams on the Columbia River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey collected data on total dissolved gas pressure, barometric pressure, water temperature, and probe depth at eight stations on the lower Columbia River from the John Day forebay (river mile 215.6) to Camas (river mile 121.7) in water year 2000 (October 1, 1999, to September 30, 2000). These data are in the databases of the U.S. Geological Survey and the U.S. Army Corps of Engineers. Methods of data collection, review, and processing, and quality-assurance data are presented in this report. The purpose of TDG monitoring is to provide USACE with (1) real-time data for managing streamflows and TDG levels upstream and downstream from its project dams in the lower Columbia River and (2) reviewed and corrected TDG data to evaluate conditions in relation to water-quality criteria and to develop a TDG data base model for modeling the effect of various management scenarios of stream flow and spill on TDG levels. Instrumentation at each fixed station consisted of a TDG probe, an electronic barometer, a data-collection platform (DCP), and a power supply. The TDG probe was manufactured by Hydrolab Corporation. The probe had individual sensors for TDG, temperature, and probe depth (unvented sensor). The TDG sensor consisted of a cylindrical framework wound with a length of Silastic (dimethyl silicon) tubing. The tubing was tied off at one end and the other end was connected to a pressure transducer. After the TDG pressure in the river equilibrated with the gas pressure inside the tubing (about 15 to 20 minutes), the pressure transducer produced a measure of the TDG presure in the River. The water-temperature sensor was a thermocouple. The barometer was contained in the display unit of the Model TBO-L, a total dissolved gas meter manufactured by Common Sensing, Inc. More information abou the TDG probe is provided by Tanner, D. Q. And Johnston and M.W. 2001. The fixed station monitors were calibrated every 2 weeks from March 10 to September 15, 2000, and every three weeks for the remainder of the year, at which time Warrendale and Bonneville forebay were the only sites in operation. The general procedure was to check the operation of the TDG probe in the field without disturbing it, replace the field probe with one that had just been calibrated in the laboratory, and then check the operation of the newly deployed field probe. The details of the laboratory calibration procedure are outlined in Tanner and Johnston, 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: Tanner, D.Q., and Johnson, M.W., 2001, Data-collection methods, quality assurance data and site considerations for total dissolved gas monitoring, Lower Columbia River, Oregon and Washington, 2000 U.S. Geological Survey, Water-Resources Investigations Report 01-4005 Portland, Oregon, U.S. Geological Survey http://oregon.usgs.gov/pubs_dir/Pdf/01-4005.pdf
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20000301
Ending_Date: 20000915
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.0
East_Bounding_Coordinate: -120.0
North_Bounding_Coordinate: 46.5
South_Bounding_Coordinate: 44.75
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 > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > DISSOLVED GASES > DISSOLVED OXYGEN
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > RIVERS/STREAM HABITAT > LOWER COLUMBIA RIVER, OREGON
Theme_Keyword: Data Collection Methods
Theme_Keyword: Quality Assurance Data
Theme_Keyword: Site Considerations
Theme_Keyword: Total Dissolved Gas Monitoring
Theme_Keyword: Lower Columbia River
Theme_Keyword: Oregon
Theme_Keyword: Washington
Theme_Keyword: Camas
Theme_Keyword: Skamania
Theme_Keyword: Warrendale
Theme_Keyword: Bonneville
Theme_Keyword: Dalles Tailwater
Theme_Keyword: Dalles Forebay
Theme_Keyword: John Day Tailwater
Theme_Keyword: John Day Forebay
Theme_Keyword: Biological Data Profile
Theme_Keyword: Bdp
Theme_Keyword: BIOTA
Theme_Keyword: ENVIRONMENT
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: OCEANS
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: DWIGHT Q. TANNER
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 10615 SE Cherry Blossom Drive
City: Portland
State_or_Province: Oregon
Postal_Code: 97216
Country: USA
Contact_Voice_Telephone: (503) 251-3289
Contact_Electronic_Mail_Address: dqtanner@usgs.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Duplicate data for John Day tailwater were collected for TDG only. Data between the two instruments compared well, as depicted on figure 12 in Tanner and Johnston, 2001, which shows how the two probes responded to daily changes in spill at the John Day Dam. The greatest differences occurred at times when gas levels changed rapidly, as a result of each probe responding at a different rate. Future deployment of redundant probes should have paired membranes with the same age and use, to reduce differences in response time. A slight bias existed between the two probes as depicted by figure 13, which represents 4,317 hourly values from March 23 to September 18, 2000. The duplicate probe was 1 foot higher in the water column and tended to read lower than the main probe. A likely cause of this bias may be reduced flow over the membrane on the duplicate probe. Perforations in the housing were originally intended for one probe located at the end of the housing. This concern will be eliminated by installing two adjacent TDG sensors on the same Hydrolab. Duplicate TDG and water temperature were collected at the John Day forebay from 4/5/2000 at 1600 hours to 4/12/2000 at 1400 hours. The duplicate probe was mounted approximately 6 feet horizontally form the main probe at the same depth. The duplicate data were collected to confirm the rapid changes in temperature and TDG above the John Day Dam that did not occur below the dam. TDG and water temperature measured by the main probe compared well with the duplicate probe. Based on the strong correlation between the two units, the rapid changes in water temperature and TDG appear to be real and not a problem with instrumentation. The cause of these rapid changes is not known at this time; however, it is suspected that water near the probes is not well mixed and occasionally water in the vertical section is transported across the face fo the dam by certain spill patterns that cause poorly mixed water to flow over the probes. Year-end summaries of water year 2000 TDG data completeness and quality are shown in table 2. Data in this table were based on the amount of hourly TDG data and barometric pressure data that could have been collected during the scheduled monitoring season. At all stations, more data was collected than was scheduled because the monitors were set up early to ensure correct operation. Because TDG in percent saturation is calculated as total dissolved gas pressure, in millimters of mercury, divided by the barometric pressure, in millimeters of mercury, multiplied by 100 percent, any hour with missing TDG pressure data or missing barometric pressure data was counted as hour of missing data for TDG in percent saturation. The percentage of real-time data received represents the data that were received via satellite telemetry at the USGS downlink. The USACE downlink operated independently, but the amount and quality of the data were very similar. At each station, 98 percent or more of the data were received real-time by the USGS downlink, with an overall average of 99.6 percent. Problems with the amount of real-time data received were usually due to malfunction or misprogramming of the data-collection platform. The collection of water temperature data had fewer complications than did the collection of TDG and barometric pressure data. There were only a few hours of missing or incorrect temperature data, except for instances where all data parameters were missing due to problems with the DCP. TDG data were considered to meet quality-assurance standars if they were within 1 percent TDG of the expected value, based on calibration data and ambient river conditions at adjacent sites. The percentage of real-timeTDG data passing quality assurance is shown in Table 2 (Tanner and Johnson, 2001) The lowest percentage for a station was 95.3 percent at Skamania, but all of the missing data was eventually restored to the database. The overall average of real-time data passing quality-assurance standards was 98.5 percent. Most problems with meeting quality-assurance standards were due to membrane failure-leaking or tearing of the TDG membrane.
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_4005
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:
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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