Chincoteague Bay calculated shear stress data from the spring and fall sampling trips of 2014 and preliminary modeled bottom shear stress values provided by the Wood’s Hole USGS office.

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Frequently anticipated questions:

What does this data set describe?

Title:
Chincoteague Bay calculated shear stress data from the spring and fall sampling trips of 2014 and preliminary modeled bottom shear stress values provided by the Wood’s Hole USGS office.
Abstract:
Scientists from the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center conducted a seasonal collection of surficial sediments from Chincoteague Bay and Tom's Cove, located between Assateague Island and the Delmarva Peninsula in March/April 2014 (2014-301-FA) and October 2014 (2014-322-FA). The sampling efforts were part of a larger U.S. Geological Survey study to assess the effects of storm events on sediment distribution. The objective of this study was to characterize the sediments of Chincoteague Bay in order to create baseline conditions to incorporate with hydrodynamic and sediment transport models in order to evaluate pre- and post-storm (Hurricane Sandy) change. This report serves as an archive for sedimentological data derived from the surface sediment. Data are available for a seasonal comparison between March/April 2014 and October 2014. Downloadable data are available as Excel spreadsheets (sediment samples) and as JPEG files (maps). Additional files include: detailed results of sediment grain size analyses, and formal Federal Geographic Data Committee metadata (data downloads).
Supplemental_Information:
This publication contains data for two field activities conducted in 2014: Spring March 26 – April 4 (2014-301-FA), 2014; and fall October 21 – 30, 2014 (2014-322-FA).
  1. How might this data set be cited?
    Ellis, Alisha M., Marot, Marci E., Wheaton, Cathryn J., Bernier, Julie C., and Smith, Christopher G., 20151205, Chincoteague Bay calculated shear stress data from the spring and fall sampling trips of 2014 and preliminary modeled bottom shear stress values provided by the Wood’s Hole USGS office.: U.S. Geological Survey Open-File Report 2015-1219.

    Online Links:

    This is part of the following larger work.

    Ellis, Alisha M., Marot, Marci E., Wheaton, Cathryn J., Bernier, Julie C., and Smith, Christopher G., 20151205, A seasonal comparison of surface sediment characteristics in Chincoteague Bay, Maryland and Virginia, USA: U.S. Geological Survey Open-File Report 2015-1219, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -75.46667
    East_Bounding_Coordinate: -75.11111
    North_Bounding_Coordinate: 38.26667
    South_Bounding_Coordinate: 37.82222
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 26-Mar-2014
    Ending_Date: 30-Oct-2014
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    14CTB_Spring and Fall_Shear Stress.xlsx.zip
    Physical lithological parameter results of surface sediment collected in Chincoteague Bay, Maryland and Virginia. (Source: USGS)
    Sample ID
    Sample identification number (Source: USGS) Character string. ##CTB-^^G Physical Data.xlxs (where # is the two digit year, and ^^ is the site location number, and where G are lagoonal PONAR grab sites).
    Latitude
    Latitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:37.87006
    Maximum:38.24602
    Units:decimal degrees
    Resolution:0.00001
    Longitude
    Longitude of sample location in decimal degrees (NAD83) (Source: USGS)
    Range of values
    Minimum:-75.41255
    Maximum:-75.18492
    Units:decimal degrees
    Resolution:0.00001
    d50
    median grain-size (Source: USGS)
    Range of values
    Minimum:5.62
    Maximum:460.32
    Units:microns
    Resolution:0.01
    D*
    dimensionless sediment parameter defined from kinematic viscosity, gravity, difference in sediment water density, and median grain-size. (Source: USGS)
    Range of values
    Minimum:0.1142
    Maximum:9.3052
    Units:dimensionless/unitless
    Resolution:0.0001
    Critical Shields Parameter
    calculated from D* (Source: USGS)
    Range of values
    Minimum:0.0339
    Maximum:0.2640
    Units:dimensionless/unitless
    Resolution:0.00001
    Critical Stress Threshold
    the amount of energy required to move a sediment particle as calculated from the definition in the paper (Source: USGS)
    Range of values
    Minimum:0.0236
    Maximum:0.2486
    Units:Pascals
    Resolution:0.0001
    Mean Wave-Current Bottom Shear Stress during Fairweather
    The average wave-current bottom shear stress value for a single sample site extrapolated from the model under fairweather conditions. (Source: USGS)
    Range of values
    Minimum:0.0100
    Maximum:0.7490
    Units:Pascals
    Resolution:0.0001
    Max Wave-Current Bottom Shear Stress during Fairweather
    The maximum wave-current bottom shear stress value for a single sample site extrapolated from the model under fairweather conditions. (Source: USGS)
    Range of values
    Minimum:0.0604
    Maximum:2.1821
    Units:Pascals
    Resolution:0.0001

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Alisha M. Ellis
    • Marci E. Marot
    • Cathryn J. Wheaton
    • Julie C. Bernier
    • Christopher G. Smith
  2. Who also contributed to the data set?
    U.S. Geological Survey
  3. To whom should users address questions about the data?
    U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Attn: Alisha M. Ellis
    Geologist
    600 4th Street South
    St. Petersburg, FL
    US

    (727) 502-8056 (voice)
    aellis@usgs.gov

Why was the data set created?

The file includes all critical stress threshold calculations from the median grain-size of the lagoonal surface sediments collected in Chincoteague Bay in March/April and October 2014 by the U.S. Geological Survey (USGS), St. Petersburg Coastal and Marine Science Center as well as preliminary model bottom shear stress values from the Woods Hole USGS office.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2014 (process 1 of 3)
    Critical stress thresholds (τcr) for the surface sediments of Chincoteague Bay were calculated using the grain-size data for the surface sediments collected during the spring and fall sampling trips of 2014 following the procedure of Soulsby (1997) as τcr = θcr (ρs - ρ) d50 where θcr is the critical Shields parameter, ρs is the density of sediment (estimated to be 2,650 kilograms per cubic meter [kg/m3]), ρ is the density of seawater (1,027 kg/m3), and d50 is the median grain-size for an individual sample. Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Alisha M. Ellis
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8056 (voice)
    aellis@usgs.gov
    Date: 2014 (process 2 of 3)
    The critical Shields parameter is calculated from a dimensionless sediment parameter, D*, as θcr = 0.30/(1+1.2D*) + 0.055 [1 – exp (-0.020D*)] with D* defined from the kinematic viscosity (v, taken as 1.36 × 10-6 meters squared per second [m2/s]) and uses gravity (g, 9.81 meters per second squared [m/s2]) as D* = d50 [g([(ρs )⁄ρ]-1)/v^2 ]^(1/3). Person who carried out this activity:
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Alisha M. Ellis
    Geologist
    600 4th Street South
    St. Petersburg, FL
    U.S.

    (727) 502-8056 (voice)
    aellis@usgs.gov
    Date: 13-Oct-2020 (process 3 of 3)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The critical stress threshold calculations reported in the tables were analyzed at the USGS SPCMSC sedimentology lab. These data have not been independently verified for accuracy.
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    This is a complete processed physical parameters data file for the spring and fall Chincoteague Bay seasonal comparison archive.
  5. How consistent are the relationships among the observations, including topology?
    This dataset also includes preliminary model values for bottom shear stress under fair-weather conditions from the USGS Woods Hole office.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Attn: Alisha M. Ellis
    600 4th Street South
    St. Petersburg, FL
    U.S.

    502-8056 (voice)
    aellis@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable data
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Any use of trade, firm, or product name is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. Is there some other way to get the data?
    none
  6. What hardware or software do I need in order to use the data set?
    These spreadsheets included in this .zip file were created for use with Microsoft Excel 2011. They may also be viewed with the Microsoft Excel viewer or by downloading a Microsoft Compatibility Pack to view with older versions of Microsoft Excel.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Attn: Alisha M. Ellis
Geologist
600 4th Street South
St. Petersburg, FL
U.S.

(727) 502-8056 (voice)
aellis@usgs.gov
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/OFR20151219_Shear_Stress-met.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:51 2021