Identification_Information: Citation: Citation_Information: Originator: John F. Bratton Originator: Emile Bergeron Publication_Date: 2014 Title: Chirp seismic-reflection profile data in JPEG image format Collected in the Indian River Bay, Delaware, on April 13, 2010, on U.S. Geological Survey Field Activity 2010-006-FA Edition: 1 Series_Information: Series_Name: Open-File Report Issue_Identification: 2011-1039 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2011/1039/data/seismics/seismic_jpegs.zip Online_Linkage: http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html Larger_Work_Citation: Citation_Information: Originator: V.A. Cross Originator: J.F. Bratton Originator: H.A. Michael Originator: K.D. Kroeger Originator: A. Green Originator: E. Bergeron Publication_Date: 2014 Title: Continuous Resistivity Profiling and Seismic-Reflection Data Collected in April 2010 from Indian River Bay, Delaware Edition: 1 Series_Information: Series_Name: Open-File Report Issue_Identification: 2011-1039 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2011/1039/ Online_Linkage: http://dx.doi.org/10.3133/ofr20111039 Description: Abstract: A geophysical survey to delineate the fresh-saline groundwater interface and associated sub-bottom sedimentary structures beneath Indian River Bay, Delaware, was carried out in April 2010. This included surveying at higher spatial resolution in the vicinity of a study site at Holts Landing, where intensive onshore and offshore studies were subsequently completed. The total length of continuous resistivity profiling (CRP) survey lines was 145 kilometers (km), with 36 km of chirp seismic lines surveyed around the perimeter of the bay. Medium-resolution CRP surveying was performed using a 50-meter streamer in a bay-wide grid. Results of the surveying and data inversion showed the presence of many buried paleochannels beneath Indian River Bay that generally extended perpendicular from the shoreline in areas of modern tributaries, tidal creeks, and marshes. An especially wide and deep paleochannel system was imaged in the southeastern part of the bay near White Creek. Many paleochannels also had high-resistivity anomalies corresponding to low-salinity groundwater plumes associated with them, likely due to the presence of fine-grained estuarine mud and peats in the channel fills that act as submarine confining units. Where present, these units allow plumes of low-salinity groundwater that was recharged onshore to move beyond the shoreline, creating a complex fresh-saline groundwater interface in the subsurface. The properties of this interface are important considerations in construction of accurate coastal groundwater flow models. These models are required to help predict how nutrient-rich groundwater, recharged in agricultural watersheds such as this one, makes its way into coastal bays and impacts surface water quality and estuarine ecosystems. For more information on the survey conducted for this project, see http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2010-006-FA. Purpose: The purpose of this dataset is to provide the seismic-reflection profile data in JPEG image format, which provides information about the sub-surface geology in the survey area. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20104013 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -75.202086 East_Bounding_Coordinate: -75.062936 North_Bounding_Coordinate: 38.618986 South_Bounding_Coordinate: 38.569244 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Field Activity Number 2010-006-FA Theme_Keyword: Info Bank ID K-6-10-DL Theme_Keyword: R/V Knob Theme_Keyword: seismic-reflection profile Theme_Keyword: JPEG Theme_Keyword: EdgeTech 424 Theme_Keyword: Chirp seismics Theme_Keyword: Open-file Report 2011-1039 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: oceans and estuaries Theme_Keyword: oceans and coastal Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: General Place_Keyword: North America Place_Keyword: North Atlantic Ocean Place_Keyword: United States Place_Keyword: Delaware Place_Keyword: Indian River Bay Place_Keyword: Indian River Inlet Place_Keyword: Holts Landing Place_Keyword: Piney Neck Place_Keyword: Rosedale Beach Access_Constraints: None. Use_Constraints: The public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. 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: Woods Hole Coastal and Marine Science Center 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 Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095 Cross_Reference: Citation_Information: Originator: J.W. Stockwell Jr. Originator: J.K. Cohen Publication_Date: 2008 Title: The New SU User's Manual (version 4.0) Publication_Information: Publication_Place: Golden, CO Publisher: Center for Wave Phenomena - Colorado School of Mines Online_Linkage: http://www.cwp.mines.edu/cwpcodes/ Data_Quality_Information: Completeness_Report: A JPEG format image is available for every seismic-reflection profile line collected on this cruise. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The navigation system used was a Lowrance 480M with an LGC-2000 Global Positioning System (GPS) antenna. The antenna was located above the seismic towfish tow point. The system towfish was attached by a short line to a cleat on a 2 x 6 board that was clamped across the bow of the boat. The towfish was on the starboard side of the boat, approximately 0.5 meters below the water surface. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Although bathymetry was not recorded directly with this system, bathymetry can be derived by tracing the seafloor reflector in the seismic-reflection profiles. The seismic towfish was attached to a cleat by a short line on the starboard side of the boat. The transducer draft was approximately 0.5 m below the water surface. The draft offset was not included in the data acquisition. Lineage: Source_Information: Source_Contribution: The seismic acquisition system used on this cruise was an EdgeTech 424 Chirp sub-bottom system with a 4 to 24 kHz pulse bandwidth and a 2 ms pulse. The system towfish was attached by a short line to a cleat on a 2 x 6 board that was clamped across the bow of the boat. The towfish was on the starboard side of the boat, approximately 0.5 meters below the water surface. The acquisition software used to record the data was Discover 3100 version 7.01. The data were recorded in the SEG-Y data format IBM floating point with navigation supplied by the Lowrance GPS system. The navigation was recorded in the header of the seismic data in an arc second format. The record length is 133 ms, with a sample interval of 23 micro-seconds and 5788 samples per trace. The fire-rate was between 4 and 6 shots per second. The GPS antenna was located above the tow position of the seismic transducer. Process_Step: Process_Description: The SEG-Y data were converted to Seismic Unix format using the following command: >segyread tape=$1.sgy verbose=1 vblock=1000 conv=1 endian=0 | \ > segyclean > $1.su This is a portion of a larger script used to extract the navigation from the SEG-Y headers. The script is initiated with a shell script so that every file with the "sgy" extension is read and converted to the SU format. Source_Used_Citation_Abbreviation: *.sgy Process_Date: 201005 Source_Produced_Citation_Abbreviation: *.su 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: Woods Hole Coastal and Marine Science Center 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: Another script executing Seismic Unix commands was run to convert the SU data file to a postscript file, and then in turn using an ImageMagick command to convert the postscript file to a JPEG. The command line example is: >plotchirp 0 0.02 l4f1.001 7 98 This runs the plotchirp script with the parameters of start time of trace 0, end time of trace 0.02 seconds, l4f1.001 is the seismic file, 7 refers to the plot height in inches, and 98 is the percent black clip (where higher is lighter). The plotchirp script is as follows: > plotchirp: >#! /bin/csh > >## PLOTCHIRP > echo "Process plotchirp usage:" > echo " plotchirp tmin tmax sufile hbox clip" > echo " tmin and tmax (seconds) to define the vertical plot window" > echo " ie, 0 0.25 (window 0 to 250 ms)" > echo " the SU input file excluding the .su extension" > echo " hbox is the vertical plot size in inches" > echo " enter the % black clip ie, 95 (higher is lighter)" > echo " " > ># get number of traces to be used in plot scale > echo "getting the total number of traces" > set numtraces = `surange < $3.su | grep traces | awk ' {print($1)}' ` > echo "number of traces = "$numtraces ># get ffid range for input > echo "getting the range of FFID's" > > set ffidmin = `surange < $3.su | grep tracr | awk ' {print($2)}' ` > set ffidmax = `surange < $3.su | grep tracr | awk ' {print($3)}' ` > > echo "The minimum FFID is "$ffidmin > echo "The maximum FFID is "$ffidmax > echo " " > echo "Setting the sort order (data window), Set gain parameters" > > suwind key=tracr min=$ffidmin max=$ffidmax itmin=$1 tmin=$1 tmax=$2 verbose=0 < $3.su | \ > suchw key1=delrt a=0 | \ > suchw key1=tstat a=0 | suchw key1=muts a=0 | suchw key1=mute a=0 > $3.tmp > > echo "Set scaling for PS plot" ># set the plot X size based on the number of traces/inch > set wbox = `expr $numtraces / 40` > echo "the plot length =" $wbox "inches" > echo > ># set the plot Y size (hbox) in inches > set tmin = $1 > echo "tmin ="$tmin > set tmax = $2 > echo "tmax ="$tmax > set hbox = $4 > echo "the plot height=" $hbox "inches" > ># PLOT POSTSCRIPT IMAGE ># Change percentile for determining black clip value to adjust plot contrast ># Higher bperc gives lighter plot - wclip=0 sets 0 and - amp. to white > > echo "Making the PostScript plot" > > supsimage wbox=$wbox hbox=$hbox \ > ybox=0.5 \ > x1beg=$1 x1end=$2 \ > d1num=0.01 d2num=500 \ > d2=1 \ > n1tic=10 n2tic=5 \ > bperc=$5 wclip=0 \ > grid1=dot grid2=dot \ > title="424 Chirp $3 SHOTS $ffidmin-$ffidmax" \ > label1="TWT [s]" label2="SHOT" \ > < $3.tmp > ../ps_files/$3.ps > >rm $3.tmp > >echo "Making jpeg" >convert ../ps_files/$3.ps ../jpeg_files/$3.jpg > ># Save the processing runline history for future processing >echo "plotchirp $1 $2 $3 $4 $5" >> Proc.log ># Remove files not needed >rm ../ps_files/*.ps Source_Used_Citation_Abbreviation: *.su Process_Date: 201005 Source_Produced_Citation_Abbreviation: *.jpg 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: Woods Hole Coastal and Marine Science Center 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 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: Woods Hole Coastal and Marine Science Center 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: Neither the U.S. government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: JPEG Format_Information_Content: The WinZip (v. 14) file contains all the JPEG format images of the seismic-reflection profiles, as well as the associated metadata. Transfer_Size: 19.9 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2011/1039/data/seismics/seismic_jpegs.zip Network_Resource_Name: http://pubs.usgs.gov/of/2011/1039/html/ofr2011-1039-catalog.html Network_Resource_Name: http://dx.doi.org/10.3133/ofr20111039 Fees: None. Technical_Prerequisites: The user must have software capable of uncompressing the zip file. These files can then be viewed with any JPEG image viewing software. Metadata_Reference_Information: Metadata_Date: 20140630 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: Woods Hole Coastal and Marine Science Center 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