Chirp Seismic-Reflection data from the John Day Reservoir

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Originator: David C. Twichell
Publication_Date: 2004
Title: Chirp Seismic-Reflection data from the John Day Reservoir
Geospatial_Data_Presentation_Form: raster digital data
Larger_Work_Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Originator: David C. Twichell
Publication_Date: 2004
Title:
Geophysical, Sedimentologic, and Photographic Data from the John Day Reservoir, Washington and Oregon: Data Archive and Preliminary Discussion
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2004-1014
Publication_Information:
Publication_Place: Woods Hole Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey
Description:
Abstract:
A two-week field operation was conducted in the John Day Reservoir on the Columbia River to image the floor of the pool, to measure the distribution and thickness of post-impoundment sediment, and to verify these geophysical data with video photography and bottom sediment samples. The field program was a cooperative effort between the USGS Coastal and Marine Geology Team of the Geologic Division and the USGS Columbia River Research Laboratory of the Biological Resources Division. The data collection was completed aboard the R/V ESTERO during September 13-27, 2000. The interest in sediment accumulation in the reservoir was two-fold. First, it was unknown how effective this reservoir was as a sediment trap to material that otherwise would have been transported down-river to the estuary and eventually to the ocean. The recent erosion of beaches along the Washington coast has been attributed to a decreased contribution of sediment from the Columbia River to the coastal system due to the damming of the river. Second, sediment accumulation on the floors of reservoirs along the Columbia River has been suggested to be diminishing salmon spawning grounds. The extent of changes in habitat since construction of the John Day Dam, however, had not been documented. Common data sets were needed to address both of these questions, and for these reasons this geophysical and sampling program was undertaken.
Purpose:
The chirp seismic-reflection profiles were collected to measure the thickness and distribution of sediment that has accumulated in the John Day Reservoir since impoundment in 1968.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20000911
Ending_Date: 20000922
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -120.69
East_Bounding_Coordinate: -119.3
North_Bounding_Coordinate: 45.943
South_Bounding_Coordinate: 45.686
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: chirp
Theme_Keyword: CMGP
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: navigation
Theme_Keyword: Open-File Report
Theme_Keyword: reservoir
Theme_Keyword: sediment thickness
Theme_Keyword: seismic
Theme_Keyword: seismic-reflection
Theme_Keyword: SIS-1000
Theme_Keyword: subbottom
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: segy
Theme_Keyword: OF 2004-1014
Theme_Keyword: Woods Hole Science Center
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: North America
Place_Keyword: United States
Place_Keyword: John Day Reservoir
Place_Keyword: John Day Dam
Place_Keyword: McNary Dam
Place_Keyword: Columbia River
Place_Keyword: Washington
Place_Keyword: Oregon
Place_Keyword: Lake Umatilla
Access_Constraints: none
Use_Constraints:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700
Data_Quality_Information:
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The navigation was collected with a P-Code plugger navigation system. Although the navigation antenna was mounted on the ship rather than the towfish, the system was towed shallow and extremely close to the boat therefore making the "layback" error negligible. Because of the high fire rates of the system, each "shot" does not have a navigation point, therefore these values have to be interpolated.
Lineage:
Process_Step:
Process_Description:
The chirp seismic subbottom data was collected with the SIS-1000 sidescan and seismic system. The transducer for the seismics is mounted on the towfish with the data collected logged on a TritonElics QMIPS computer system. The seismic data was separated from the raw data file and converted to the SEG-Y format using the USGS Unix program "qmipstosegy".
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
The seismic data were then further processed using SeismicUnix to filter and add gain to the data as well as output a format for printing. Lines 1-7, and lines 37-40 were collected at a 0.8 second fire rate. Lines 8-36 were collected at a 0.530 fire rate.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 11
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -117.000000
Latitude_of_Projection_Origin: +00.000000
False_Easting: 500000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 20
Ordinate_Resolution: 20
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The chirp seismic subbottom data was collected with the SIS-1000 sidescan and seismic system. The transducer for the seismics is mounted on the towfish with the data collected logged on a TritonElics QMIPS computer system. The seismic data was separated from the raw data file and converted to the SEG-Y format using the Unix program "qmipstosegy". The seismic data were then further processed using SeismicUnix to filter and add gain to the data as well as output a format for printing. Test line 1 and lines 1-7, and lines 37-40 were collected at a 0.8 second fire rate. Test line 3 and lines 8-36 were collected at a 0.530 fire rate. Due to the limitations of "qmipstosegy", the navigation information stored in the SEG-Y headers is all UTM, zone 11, WGS84. The study area actually covers zones 10 and 11, but for consistency, all values are in zone 11. Seismic test lines and line 1-7 did not have the pressure depth sensor functioning. The value for depth was coming from the Hypack navigation system which was hardwired at 3m. Seismic lines 8-40 should have the pressure depth value from the sensor. However, the value reported appeared to be too shallow. The hardwired depth value from Hypack during these data collections lines was 1.5 m - the actual measured depth of the fish. Additional information of use - the chirp length on the 0.800 second fire rate is 20 ms, and 12 ms on the 0.530 second fire rate.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SEGY
Metadata_Reference_Information:
Metadata_Date: 20040309
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Rd.
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.3 on Tue Mar 09 13:54:12 2004