Metadata: Identification_Information: Citation: Citation_Information: Originator: P. Soupy Dalyander Originator: Joseph W. Long Originator: Nathaniel G. Plant Originator: David M. Thompson Publication_Date: 2012 Title: Hydrodynamic and Sediment Transport Model Application for OSAT3 Guidance: Ratio of the wave- and current-induced shear stress to the critical value for oil-tar balls and sediment mobilization weighted by probability of wave scenario occurrence Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2012-1234 Publication_Information: Publication_Place: St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://pubs.usgs.gov/of/2012/1234/datafiles.html Larger_Work_Citation: Citation_Information: Originator: Nathaniel G. Plant Originator: Joseph W. Long Originator: P.Soupy Dalyander Originator: David M. Thompson Publication_Date: 2012 Title: Hydrodynamic and Sediment Transport Model Application for OSAT3 Guidance Edition: 1.0 Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2012-1234 Publication_Information: Publication_Place: St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://pubs.usgs.gov/of/2012/1234/ Description: Abstract: The U.S. Geological Survey has developed a method for estimating the mobility and potential alongshore transport of heavier-than-water sand and oil agglomerates (tarballs or surface residual balls, SRBs). During the Deepwater Horizon spill, some oil that reached the surf zone of the northern Gulf of Mexico mixed with suspended sediment and sank to form sub-tidal mats. If not removed, these mats can break apart to form SRBs and subsequently re-oil the beach. A method was developed for estimating SRB mobilization and alongshore movement. A representative suite of wave conditions was identified from buoy data for April, 2010, until August, 2012, and used to drive a numerical model of the spatially-variant alongshore currents. Potential mobilization of SRBs was estimated by comparing combined wave- and current-induced shear stress from the model to critical stress values for several sized SRBs. Potential alongshore flux of SRBs was also estimated to identify regions more or less likely to have SRBs deposited under each scenario. This methodology was developed to explain SRB movement and redistribution in the alongshore, interpret observed re-oiling events, and thus inform re-oiling mitigation efforts. Purpose: This GIS layer contains an estimate of the average percentage of time sediment and surface residual balls (SRBs) of various sizes are mobilized in the shallow northern Gulf of Mexico (Alabama and portion of the Florida coast) for the time period of 04/01/2010 to 08/01/2012. This output is based on numerical model output of wave and circulation patterns for a set of 80 wave height scenarios, each corresponding to a particular set of offshore wave conditions at NOAA NDBC buoy 42040. The wave and wind conditions at the buoy each hour over the time period of interest have been identified as most closely corresponding to 1 of these 80 conditions, and a probability of occurrence assigned to each scenario based on the percentage of observations assigned to that scenario (see included wave_scenarios.txt). This layer contains the weighted average of spatially variant mobility for each scenario (1 = mobile, 0 = immobile), calculated for sediment and several size classes of SRBs. Values range from 0 to 1, with 0 indicating a spatial location is never mobilized and 1 indicating the location is mobilized under all conditions represented. Characteristics of SRB classes and the sediment properties used may be found in the look-up table included in the GIS zip file, SRB_casses.txt. This data layer is intended to show regions of likely mobilization for intended use by individuals in SRB mitigation attempting to explain redistribution or burial of SRBs under specific wave conditions. Supplemental_Information: This data layer is a subset of USGS Open-File Report 2012-1234, Hydrodynamic and Sediment Transport Model Application for OSAT3 Guidance. It is a weighted average of mobility for sediment and various size SRBs based on probability of occurrence for a range of wave climate scenarios. The results for each individual scenario that form the basis of this weighted averaged may be found within the report, naming convention Hh_Dd_mobility, where Hh_Dd indicates the specific scenario (see wave_scenarios.txt). SRB class and sediment properties may be found in the look-up table included in the GIS zip file, SRB_casses.txt. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100401 Ending_Date: 20120801 Currentness_Reference: ground condition Status: Progress: Planned Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.716961 East_Bounding_Coordinate: -85.410773 North_Bounding_Coordinate: 30.693965 South_Bounding_Coordinate: 29.400356 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:eae53510-ffdf-4e97-b2c2-15e5cedb791a Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: bottom shear stress Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: wave Theme_Keyword: current Theme_Keyword: Delft3D Theme_Keyword: St. Petersburg Coastal and Marine Science Center Theme_Keyword: SPCMSC Theme_Keyword: tarballs Theme_Keyword: surface residual balls Theme_Keyword: SRBs Theme_Keyword: sediment mobility Theme_Keyword: surf zone Theme_Keyword: alongshore currents Theme_Keyword: wave-driven currents Theme_Keyword: oceans and estuaries Theme_Keyword: oceans and coastal Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: environment Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: predictions Theme_Keyword: physical/chemical features Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: coastal processes Theme_Keyword: numerical modeling Theme_Keyword: pollution Theme_Keyword: petroleum spills Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: coastal processes Theme_Keyword: contaminant transport Theme_Keyword: industrial pollution Theme_Keyword: mathematical modeling Theme_Keyword: ocean processes Theme_Keyword: petroleum Place: Place_Keyword_Thesaurus: Geographic Names Information System Place_Keyword: Gulf of Mexico Place_Keyword: Florida Place_Keyword: Alabama Place_Keyword: United States Place_Keyword: North America Place_Keyword: Atlantic Ocean Place_Keyword: Mobile Bay Place_Keyword: Pensacola Bay Place_Keyword: Choctawhatchee Bay Place_Keyword: Santa Rosa Place_Keyword: Fort Pickens Place_Keyword: Gulf Shores Place_Keyword: Panama City Place_Keyword: Little Lagoon Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: seafloor Access_Constraints: None Use_Constraints: 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: P. Soupy Dalyander Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2290 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: sdalyander@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: model_bathymetry.jpg Browse_Graphic_File_Description: Graphic showing the numerical model domain over which analysis is conducted. Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The attributes in this data layer correspond to an average of mobility estimates for 80 individual representative wave scenarios, weighted by probability of occurrence over the time period of 04/01/2010 to 08/01/2012, for sediment and various classes of SRBs, the characteristics of which may be found in the included SRB_classes.txt file. The bottom shear stress used in estimating mobility was calculated from wave and current estimates generated with Delft3D, and would vary if different models were used or if different model inputs (such as bathymetry, forcing winds, and boundary conditions) or parameterizations were chosen. Calculated currents were depth-averaged and therefore the calculated mobility values are expected to be most valid in well-mixed regions, e.g., the surf zone. Mobility estimates would vary for different size or density objects and/or if a different formulation for calculating the critical stress value is used. Mobility estimates would also vary if a different set of wave scenarios (see wave_scenarios.txt) were used to represent the time frame of interest, or if a different time period of interest was examined. Logical_Consistency_Report: No duplicate features are present. All polygons are closed, and all lines intersect where intended. No undershoots or overshoots are present. Completeness_Report: All model output values were used in the calculation of this statistic. The statistic was calculated as an average of mobility estimates for 80 individual representative wave scenarios, weighted by probability of occurrence over the time period of 04/01/2010 to 08/01/2012, for sediment and various classes of SRBs, the characteristics of which may be found in the included SRB_classes.txt file. The bottom shear stress used in estimating mobility was calculated from wave and current estimates generated with Delft3D, and would vary if different models were used or if different model inputs (such as bathymetry, forcing winds, and boundary conditions) or parameterizations were chosen. Calculated currents were depth-averaged and therefore the calculated mobility values are expected to be most valid in well-mixed regions, e.g., the surf zone. Mobility estimates would vary for different size or density objects and/or if a different formulation for calculating the critical stress value is used. Mobility estimates would also vary if a different set of wave scenarios (see wave_scenarios.txt) were used to represent the time frame of interest, or if a different time period of interest was examined. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Numerical models are used in the generation of hydrodynamic conditions used in creating this data layer. Because the overall horizontal accuracy of the data set depends on the accuracy of the model, the underlying bathymetry, forcing values used, and so forth, the spatial accuracy of this data layer cannot be meaningfully quantified. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: NOAA National Centers for Environmental Prediction (NCEP) Publication_Date: 20110601 Title: NOAA/NCEP Global Forecast System (GFS) Atmospheric Model Publication_Information: Publication_Place: Camp Springs, MD Publisher: NOAA National Centers for Environmental Prediction Online_Linkage: http://nomads.ncdc.noaa.gov/data.php Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100401 Ending_Date: 20120531 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NOAA GFS Source_Contribution: Wind speed data at 10 m above the sea surface from the NOAA Global Forecast System (GFS) 0.5 degree model is interpolated by NOAA to the 4' Wavewatch3 grid and archived. These archived data are used to drive the numerical wave and circulation model that creates estimated of bottom shear stress. Source_Information: Source_Citation: Citation_Information: Originator: NOAA National Centers for Environmental Prediction (NCEP Publication_Date: 20121001 Title: NOAA/NWS/NCEP 4' Wavewatch III Operational Wave Forecast Publication_Information: Publication_Place: Camp Springs, MD Publisher: NOAA National Centers for Environmental Prediction Online_Linkage: http://polar.ncep.noaa.gov/waves/index2.shtml Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100401 Ending_Date: 20120531 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NOAA WW3 Source_Contribution: Boundary conditions for the wave model were provided by the 4' NOAA/NWS/NCEP Wavewatch III operational ocean wave forecast. Source_Information: Source_Citation: Citation_Information: Originator: National Data Buoy Center Publication_Date: 20120901 Title: National Data Buoy Center Buoy 42040 Publication_Information: Publication_Place: Stennis Space Center, MS Publisher: National Oceanic and Atmospheric Administration Online_Linkage: http://www.ndbc.noaa.gov/station_page.php?station=42040 Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20100401 Ending_Date: 20120801 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: NDBC42040 Source_Contribution: Observational wave data from NDBC Buoy 42040 were used to identify the percentage of observations between 04/01/2010 and 08/01/2012 which corresponded to each of 80 wave scenarios distinguished by wave height and direction, and to identify a characteristic time period in the record for each scenario. Process_Step: Process_Description: Using observed wave conditions from NOAA buoy 42040 and Mathworks MATLAB software 2012A, the hourly wave buoy observations between 04/01/2010 and 08/01/2012 were each classified as falling into 1 of 80 wave scenarios defined by wave height and direction. For each scenario, a specific time step was identified in the record which was most representative of the other observations within the same wave height and direction bins based on both wave (height, period, and direction) and wind (speed and direction) characteristics. The characteristics of these scenarios, along with the percentage of observation in the record and the chosen representative time period, may be found in wave_scenarios.txt. The probability of occurrence for each wave scenario along with its characteristics and representative time periods were saved in MATLAB .mat format. Source_Used_Citation_Abbreviation: NDBC42040 Process_Date: 2012 Source_Produced_Citation_Abbreviation: WAVE_SCENARIOS Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Nathaniel Plant Contact_Organization: USGS Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street S City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: (727) 803-8747 x3072 Contact_Facsimile_Telephone: (727) 803-2023 Contact_Electronic_Mail_Address: nplant@usgs.gov Process_Step: Process_Description: The D-Flow and D-Waves components of the Deltares Delft3D numerical model suite (version 4.00.01) were used to estimate bottom orbital velocity, peak period, peak wave direction, and east and north components of wind and wave-driven velocity for the offshore wave conditions corresponding to each scenario's representative time period (characteristics of which may be found in the included wave_scenarios.txt file) in each grid cell in the model domain. The wave model D-Waves, based on the Simulating WAves Nearshore (SWAN) model, is a 3rd generation phase-averaged numerical wave model which conserves wave energy subject to generation, dissipation, and transformation processes and resolves spectral energy density over a range of user-specified frequencies and directions. D-Wave was used in stationary mode. D-Flow solves the shallow water Navier Stokes equations and is run in 2-D depth-averaged mode, with linkage to D-Waves allowing the generation of wave-driven currents via wave radiation stress forcing. Default values for model parameters governing horizontal viscosity, bottom roughness, and wind drag were used. Neumann boundary conditions were used along the east, west, and south model boundaries with harmonic forcing set to zero. Model bathymetry was provided by the NOAA National Geophysical Data Center Northern Gulf Coast digital elevation map, referenced to NAVD88. Significant wave height, dominant wave period, and wave direction were prescribed as D-Wave TPAR format files every 30 grid cells along the model boundary using results from the NOAA Wavewatch III 4' multi-grid model for a representative moment in time corresponding to the offshore wave conditions of the scenario, the specific time of which may be found in the included wave_scenarios.txt file. A JONSWAP (JOint NOrth Sea WAve Project) spectral shape was assumed at these boundary points. Wind forcing was provided using the archived WavewatchIII 4' winds, extracted from the NOAA GFS wind model, for this time. The D-Wave directional space covers a full circle with a resolution was 5 degrees (72 bins). The frequency range was specified as 0.05-1 Hz with logarithmic spacing. Bottom friction calculations used the JONSWAP formulation with a uniform roughness coefficient of 0.067 m2/s3. 3rd-generation physics are activated which accounts for wind wave generation, triad wave interactions and whitecapping (via the Komen et al parameterization). Depth-induced wave breaking dissipation is included using the method of Battjes and Janssen with default values for alpha (1) and gamma (0.73). Wave model outputs of bottom orbital velocity, peak period, and peak wave direction were extracted on the wave model grid, and current model outputs of east and north current velocity component were extracted and interpolated to the wave model grid (staggered points in relation to the current model grid). NDBC observations from station 42012 for the representative scenario time periods were used to validate the wave model results. Source_Used_Citation_Abbreviation: NOAA GFS Source_Used_Citation_Abbreviation: NOAA WW3 Source_Used_Citation_Abbreviation: WAVE_SCENARIOS Process_Date: 2012 Source_Produced_Citation_Abbreviation: DELFT3D Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Joseph W. Long Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street S City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 803-8747 x3024 Contact_Facsimile_Telephone: (727) 803-2032 Contact_Electronic_Mail_Address: jwlong@usgs.gov Process_Step: Process_Description: Use the wave model and current model results to calculate the bottom shear stress within each model grid cell for each scenario using Mathworks MATLAB software (v2012A). The wave-current stress was calculating following the method of Soulsby (1995) to parameterize four methods giving good overall performance for estimating wave-current stress, based on original formulations by Grant and Madsen (1979), Fredsøe (1984), Huynh-Thanh and Temperville (1991), and Davies et al. (1998). The combined wave-current stress for the individual components of wave and current stress was calculated for hydrodynamic model output following the method prescribed in Soulsby (1997) for each of the four methods. The mean value of the four methodologies was used to estimate the combined wave-current shear stress for each hydrodynamic scenario. Wave direction, bottom orbital velocity, and period, and depth-averaged current magnitude and direction, required for this calculation, are calculated internally by the model. The roughness used is 1/12 the diameter of the SRB or sediment being analyzed, following Soulsby (1997). Stress values are saved in MATLAB .mat format. The same individual who completed this processing step completed all additional processing steps. References: Davies, A.G., Soulsby, R.L., King, H.L. (1988). A numerical model of the combined wave and current bottom boundary layer. J. Geophys. Res. 93, 491-508. Fredsøe, J. (1984). Turbulent boundary layer in wave-current motion. J. Hydraul. Eng. ASCE (110), 1103-1120. Grant, W.D., Madsen, O.S. (1979). Combined wave and current interaction with a rough bottom. J. Geophys. Res. (84), 1797-1808. Huynh-Thanh, S., Temperville, A. (1991). A numerical model of the rough turbulent boundary layer in combined wave and current interaction, in Sand Transport in Rivers, Estuaries, and the Sea, eds. R. L. Soulsby and R. Bettess, pp 93-100. Balkema, Rotterdam. Soulsby, R.L. (1995). Bed shear-stresses due to combined waves and currents, in Advances in Coastal Morphodynamics, eds. M.J.F. Stive, H.J. de Vriend, J. Fredsøe, L. Hamm, R.L. Soulsby, C. Teisson and J.C. Winterwerp, pp. 4-20 and 3-23. Delft Hydraulics, Netherlands. Soulsby, R.L. (1997). Dynamics of Marine Sands. Thomas Telford Publications: London, 249 pp. Source_Used_Citation_Abbreviation: DELFT3D Process_Date: 2012 Source_Produced_Citation_Abbreviation: WC STRESS Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: P. Soupy Dalyander Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2290 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: sdalyander@usgs.gov Process_Step: Process_Description: Estimate the critical shear stress for 300 micron quartz sediment and 6 SRB size classes and take the ratio of the combined wave-current stress to this critical value at each grid point for each scenario. The specific characteristics for the sediment and SRB classes may be found in the included SRB_classes.txt file. Calculations are performed in Mathworks MATLAB (v2012A). Critical stress thresholds are calculated using the Shield's parameter following Soulsby (1997) and saved in MATLAB .mat format. These ratios may also be found in ArcGIS format within the same OFR containing this layer, with naming convention Hh_Dd_mobility corresponding to results for scenario Hh_Dd. In the case of SRBs, the Shield's parameter is identified as a "high" critical stress value, corresponding to instances when an SRB of the identified size is within a uniform bed of similarly sized SRBs. Exposure above the bed, such as may occur with a single SRB on a sand band, reduces the critical shear stress value for incipient motion. Based on field observations of gravel and sand mixtures, a "medium" critical stress value is calculated from a constant non-dimensional Shields parameter of 0.02, and a "low" critical stress value is calculated from a constant non-dimensional Shields parameter of 0.01 (Andrews, 1983; Bottacin-Busolin et al, 2008; Fenton and Abbott, 1977; Wiberg and Smith, 1987; Wilcock, 1998). Because the in-situ sediment is assumed to be of a relatively uniform size, a single critical stress value based on the Shields parameter is used. References: Andrews, E.D. (1983). Entrainment of gravel from naturally sorted riverbed material. Geo. Soc. Amer. Bull. (94), 1225-1231. Bottacin-Busolin, A., Tait, S.J., Marion, A., Chegini, A., Tregnaghi, M. (2008). Probabilistic description of grain resistance from simultaneous flow field and grain motion measurements. Water Resources Res. (44), WO9419. Fenton, J.D., Abbott, J.E. (1977). Initial movement of grains on a stream bed: the effect of relative protusion. Proc. R. Soc. Lond. A. (352), 523-537. Soulsby, R., 1997. Dynamics of Marine Sands, a Manual for Practical Applications. Thomas Telford Publications, London. Wibert, P.L., Smith, J.D. (1987). Calculations of the Critical Shear Stress for Motion of Uniform and Heterogenous Sediments. Water Resources Res. (23), 1471-1480. Wilcock, P.R. (1998). Two-Fraction Model of Initial Sediment Motion in Gravel-Bed Rivers. Science (280), 410-412. Source_Used_Citation_Abbreviation: WC STRESS Process_Date: 2012 Source_Produced_Citation_Abbreviation: RATIO Process_Step: Process_Description: For each scenario, the ratio of stress to critical stress for sediment and each SRB class was converted into a binary matrix of zeros and ones, with zero at all location where the ratio was less than 1 (indicating no mobility) and one at all locations where the ratio was greater than 1 (indicating mobility). The average of this value in each grid cell for sediment and each size of SRB was calculated for each scenario, weighting the scenario value by the percent observation of that scenario in the time period of 04/01/2010 to 08/01/2012. Source_Used_Citation_Abbreviation: WAVE_SCENARIOS Source_Used_Citation_Abbreviation: RATIO Process_Date: 2012 Source_Produced_Citation_Abbreviation: MOBILITY Process_Step: Process_Description: Exported the values for each grid cell from MATLAB format into an ArcGIS shapefile using the Mathworks MATLAB Mapping Toolbox (v2012A). Land grid cells are not exported to Arc. The shapefile is written with the "shapewrite" command. Because MATLAB does not assign a projection, the projection corresponding to the projection associated with the bathymetry used in the numerical models is added in ArcCatalog 9.3. The file was then quality checked in ArcMap to insure values were properly exported to the shapefile from MATLAB. Source_Used_Citation_Abbreviation: MOBILITY Process_Date: 2012 Process_Step: Process_Description: Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Process_Date: 20170313 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Alan O. Allwardt Contact_Position: Contractor -- Information Specialist Contact_Address: Address_Type: mailing and physical address Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-460-7551 Contact_Facsimile_Telephone: 831-427-4748 Contact_Electronic_Mail_Address: aallwardt@usgs.gov Process_Step: Process_Description: Keywords section of metadata optimized by correcting variations of theme keyword thesauri and updating/adding keywords. Process_Date: 20180403 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Arnell S. Forde Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Contact_Voice_Telephone: 727-502-8000 Contact_Electronic_Mail_Address: aforde@usgs.gov Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20201013 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road 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_Data_Organization_Information: Indirect_Spatial_Reference: Gulf of Mexico Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 682608 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000001 Longitude_Resolution: 0.000001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.01 m Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Weighted_mobility Entity_Type_Definition: Ratio of the wave- and current-induced shear stress to the critical value for oil-tar balls and sediment mobilization weighted by probability of wave scenario occurrence Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: sediment Attribute_Definition: Estimate of the fraction of time 300 micron quartz sand is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB1_high Attribute_Definition: Estimate of the fraction of time SRB class 1 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB1_med Attribute_Definition: Estimate of the fraction of time SRB class 1 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB1_low Attribute_Definition: Estimate of the fraction of time SRB class 1 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB2_high Attribute_Definition: Estimate of the fraction of time SRB class 2 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB2_med Attribute_Definition: Estimate of the fraction of time SRB class 2 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB2_low Attribute_Definition: Estimate of the fraction of time SRB class 2 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB3_high Attribute_Definition: Estimate of the fraction of time SRB class 3 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB3_med Attribute_Definition: Estimate of the fraction of time SRB class 3 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB3_low Attribute_Definition: Estimate of the fraction of time SRB class 3 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB4_high Attribute_Definition: Estimate of the fraction of time SRB class 4 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB4_med Attribute_Definition: Estimate of the fraction of time SRB class 4 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB4_low Attribute_Definition: Estimate of the fraction of time SRB class 4 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB5_high Attribute_Definition: Estimate of the fraction of time SRB class 5 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB5_med Attribute_Definition: Estimate of the fraction of time SRB class 5 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB5_low Attribute_Definition: Estimate of the fraction of time SRB class 5 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB6_high Attribute_Definition: Estimate of the fraction of time SRB class 6 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from the Shield's parameter. The Shield's parameter is a relatively high critical stress estimate and does not account for a reduced critical stress due to potential SRB exposure above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB6_med Attribute_Definition: Estimate of the fraction of time SRB class 6 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.02. This critical stress estimate is a mid-range value accounting for a reduced critical stress due to some exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: SRB6_low Attribute_Definition: Estimate of the fraction of time SRB class 6 (see SRB_classes.txt) is mobilized for the time period of 04/01/2010 to 08/01/2012, with critical stress value calculated from a non-dimensional Shield's parameter of 0.01. This critical stress estimate is a low value accounting for a reduced critical stress due to exposure of the SRB above the seafloor. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: non-dimensional Attribute_Measurement_Resolution: 0.01 Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: P. Soupy Dalyander Contact_Organization: U.S. Geological Survey Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2290 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: sdalyander@usgs.gov Resource_Description: Weighted_mobility.shp: estimated percentage of time sediment and various size SRBs (see SRB_classes.txt). are mobilized for the time period of 04/01/2010 to 08/01/2012. 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: SHP Format_Version_Number: 3.3 Format_Specification: ESRI shapefile Format_Information_Content: WinZip archive file containing the shapefile components. The WinZip file also includes FGDC compliant metadata. File_Decompression_Technique: WinZip 12.0 archive Transfer_Size: 38 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://pubs.usgs.gov/of/2012/1234/datafiles.html Fees: None Technical_Prerequisites: These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. Metadata_Reference_Information: Metadata_Date: 20201013 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: P. Soupy Dalyander Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Role City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2290 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: sdalyander@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: None Metadata_Use_Constraints: None