RES2DINV Format Continuous Resistivity Profiles Collected in the Neuse River, May 4, 2005

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: John F. Bratton
Originator: VeeAnn A. Cross
Publication_Date: 2005
Title:
RES2DINV Format Continuous Resistivity Profiles Collected in the Neuse River, May 4, 2005
Online_Linkage:
<http://pubs.usgs.gov/of/2005/1306/data/2005/res2dinv_format/may4_res2dinv.zip>
Larger_Work_Citation:
Citation_Information:
Originator: VeeAnn A. Cross
Originator: John F. Bratton
Originator: Emile Bergeron
Originator: Jeff K. Meunier
Originator: John Crusius
Originator: Dirk Koopmans
Publication_Date: 2005
Title:
Continuous Resistivity Profiling Data from the Upper Neuse River Estuary, North Carolina, 2004-2005
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2005-1306
Publication_Information:
Publication_Place: Woods Hole Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <http://pubs.usgs.gov/of/2005/1306>
Description:
Abstract:
The Neuse River Estuary in North Carolina is a broad, V-shaped water body located on the southwestern end of Pamlico Sound. This estuary suffers from severe eutrophication for which several water quality models have recently been developed to aid in the management of nutrient loading to the estuary. In an effort to help constrain model estimates of the fraction of nutrients delivered by direct ground-water discharge, continuous resistivity profile (CRP) measurements were made during the spring of 2004 and 2005. CRP is used to measure electrical resistivity of sediments, a property that is sensitive to difference in salinity of submarine ground water. The 2004 and 2005 surveys used floating resistivity streamers of 100 m and 50 m respectively. The depth penetration of the streamers is approximately 20% of the streamer length which translates to approximately 20-25 m with the 100 m streamer and 12-14 m with the 50 m streamer. These data were processed using AGI's EarthImager 2D software. CRP data enables the mapping of the extent and depth of the fresher ground water within the estuary.
Purpose:
To provide the linearized raw resistivity data collected by the AGI SuperSting system in the RES2DINV format.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20050504
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.020917
East_Bounding_Coordinate: -76.812000
North_Bounding_Coordinate: 35.102200
South_Bounding_Coordinate: 34.936783
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: CMGP
Theme_Keyword: coastal
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: Continuous Resistivity Profiling
Theme_Keyword: CRP
Theme_Keyword: ground-water
Theme_Keyword: marine resistivity
Theme_Keyword: submarine ground-water
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Science Center
Theme_Keyword: Open-File Report
Theme_Keyword: OF 2005-1306
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Neuse River
Place_Keyword: North America
Place_Keyword: North Carolina
Place_Keyword: Pamlico Sound
Place_Keyword: United States
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: John F. Bratton
Contact_Organization: U.S. Geological Survey
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 x2254
Contact_Facsimile_Telephone: (508) 457-2310
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535
Data_Quality_Information:
Lineage:
Source_Information:
Source_Contribution:
These data were acquired with an AGI SuperSting Marine system that is described at the website: www.agiusa.com/marinesystem.shtml. The particular system used for this acquisition was an 11 electrode array with electrodes spaced 5 meters apart. The potential electrodes are made of graphite, with the remaining electrodes stainless steel. A dipole-dipole configuration was used for the data collection in which two fixed current electrodes are assigned with the measurement of voltage potentials between electrode pairs in the remaining electrodes. Each line of data acquisition records several files. The two files necessary for processing are the *.stg and *.gps file. The STG file contains the resistivity data, while the GPS file contains the navigation information.
Process_Step:
Process_Description:
The data were transferred from the logging computer via AGISSAdmin software. The data files available for this day are L2F1.*, L3F1.*, L4F1.*, and L5F1.*.
Process_Step:
Process_Description:
The data were merged with navigation and linearized using AGI's Marine Log Manager software.
Process_Step:
Process_Description:
In most cases, only that portion of the linearized file that had positive distance along values was exported to the new STG file. In the case of L3F1, L4F1, and L5F1, the entire file was selected for export. These lines were run perpendicular to shore, starting at the shore. Exporting the whole line was necessary to get the nearshore values. Because of the length of one of the files, as well as incorporated turns, L2F1 is broken up and exported to 4 new STG files, and accompanying DEP files. The DEP file contains the distance along line and bathymetry values. L2F1 is broken into L2F1_part1proc.*, L2F1_part2proc.*, L2F1_part3proc.*, L2F1_part4proc.*.
Process_Step:
Process_Description:
The DEP files were checked for anomalous bathymetry values, and those lines within the DEP file were deleted. For L3F1, L4F1, and L5F1, the file that was exported in its entirety (which included negative distances along line), had a depth value of 0.1 assigned to the first point in the DEP file. In addition, the first distance along point in the DEP file was modified to be the same as the first point in the XYZ output of a test processing. This was done to ensure that the entire inversion had a water column constraint.
Source_Used_Citation_Abbreviation:
L2F1_part1proc.dep, L2F1_part2proc.dep, L2F1_part3proc.dep, L2F1_part4proc.dep
Source_Produced_Citation_Abbreviation:
L2F1_part1proc_mod.dep, L2F1_part2proc_mod.dep, L2F1_part3proc_mod.dep, L2F1_part4proc_mod.dep
Process_Step:
Process_Description:
The STG and DEP files (with an average water resistivity value) were converted to a format suitable for the RES2DINV processing software. The conversion was accomplished by a Visual Basic 6 program written at the USGS office in Woods Hole.
Distribution_Information:
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.
Metadata_Reference_Information:
Metadata_Date: 20051101
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 2.8.6 on Tue Nov 01 14:43:41 2005