VASEDS, 1981

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Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator:
Virginia Institute of Marine Science (VIMS), College of William and Mary
Publication_Date: 1981
Title: VASEDS, 1981
Geospatial_Data_Presentation_Form: tabular digital data
Online_Linkage:
<http://www.chesapeakebay.net/data/historicaldb/sedimentsmain.htm>
Online_Linkage: <ftp://ftp.chesapeakebay.net/Historical/Sediment/vased_sum.txt>
Description:
Abstract:
The distribution of the physical properties; patterns of deposition and rates of accumulation of sediments provide an integrating framework for investigations of the concentration and distribution of toxic substances. Over 2;000 grab samples of surface-sediment (1.4 km grid) reveal that the bottom of the Virginia portion of Chesapeake Bay is significantly sandier than hitherto reported. About 65% of the area is sand. The number of samples in this study is an order of magnitude greater (2;000 versus 200) than previous studies allowing a significantly better delineation of sedimentary characteristics. Distribution of sediment size is; in large part; a function of geomorphology; there being an apparently good correlation between depth and sediment type; the finer grained sediments are usually confined to the deeper channels. The exceptions to the depth:size relationship are the presence of grained sedimentation fines in the shallow; marginal embayments such as Mobjack Bay and the absence of fines in the deep channel in the southeastern section of the Bay. The occurence of sands here is a function of infilling with sands from the area of the Bay mouth and; perhaps; of scour into older (Pliocene) materials. Sediment distribution also reflects the local source with the shallow-water; marginal sands derived from erosion of the banks and relict features. Several large geomorphic features are distinguishable on the maps of sediment characteristics. These features include the deep channels; a large sand-shield near Tangier Island; relict spits; and the zone of influence of the Bay mouth. Nine hundred samples; selected to avoid the coarser sands; were analyzed for total carbon; organic carbon; and sulfur contents. There are strong correlations between these characteristics and sediment type; especially weight-percent clay. Additionally; there is a good relationship between the organic carbon and sulfur contents. Although total carbon content reached 10% in some samples; the average was 1.5%. Average organic carbon and sulfur contents were 1.0 and 0.34%. Comparisons of the bathymetry on charts from the 1850's and 1950's were used to delineate the patterns and volumes of cut and fill in the Virginia portion of the Chesapeake Bay. The comparisons were adjusted for relative sea level change and monthly variations in mean tide level. In addition; propagation of the error was evaluated and the results applied. Coupled with the data concerning the character of the surface sediments and adjusted for water content; the volumes of sediment shown by the bathymetric changes to have been deposited were converted to the masses of sand; silt; and clay deposited in a 100-year period. The patterns of deposition and erosion; particularly when coupled with grain-size information; provide very important insights into the sedimentation processes within the Bay. The main Bay-axial channel from Maryland and the transition to the Virginia basin are the principal deposition sites for clay. Silt-sized materials are somewhat more uniformly distributed throughout the stem; however; about 33% of silt accumulates in the transition region; an area of relatively low tidal-current energy. The Bay mouth may be the principal source of silt. The pattern of deposition of sand suggests that the Bay mouth source is very significant as very fine sands penetrate much further into the Bay than has heretofore been suspected. The patterns are consistent with present understanding of circulation within the Bay. The project includes an attempt at constructing a sediment budget using published values for silt and clay estuarine advection and contributions from shore erosion measured against the bottom residual accumulations. The residual accumulation of silt and clay is an order of magnitude larger than previously estimated. No previous work has considered the sand budget but the general assumption has been that the contribution from shore erosion would be the principal source. This study indicates the residue bottom accumulation of sand is greater than the shore erosion contribution by a factor of 40. It is evident that additional understanding of the flux of sediment through the Bay mouth and the mouths of the flanking tributaries is required. (<http://www.chesapeakebay.net/data/historicaldb/sedimentsmain.htm>)
Purpose:
To determine sediment distribution, physical properties, sedimentation budgets, and rates in the Virginia Portion of the Chesapeake Bay
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 197811
Ending_Date: 197906
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.490540
East_Bounding_Coordinate: -75.648560
North_Bounding_Coordinate: 37.956670
South_Bounding_Coordinate: 36.885530
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: analyses
Theme_Keyword: grain size
Theme_Keyword: United States Environmental Protection Agency
Theme_Keyword: U.S. EPA
Theme_Keyword: Virginia Institute of Marine Science
Theme_Keyword: VIMS
Theme_Keyword: College of William and Mary
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: U.S. Atlantic East Coast
Place_Keyword: Coast
Place_Keyword: Mid-Atlantic Bight
Place_Keyword: Mobjack Bay
Place_Keyword: Pocomoke Sound
Place_Keyword: York River
Place_Keyword: Rappahannock River
Place_Keyword: Tangier Sound
Place_Keyword: Piankatank River
Place_Keyword: Chesapeake Bay
Place_Keyword: Viriginia
Place_Keyword: North Atlantic Ocean
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Duane Wilding
Contact_Organization: Environmental Protection Agency, Chesapeake Bay Program
Contact_Position: PROJECT OFFICER (EPA Grant No. R806001010)
Contact_Address:
Address_Type: mailing and physical address
Address: 410 Severn Ave, Suite 109
City: Annapolis
State_or_Province: MD
Postal_Code: 21403
Country: USA
Contact_Voice_Telephone: 1-800-YOUR-BAY
Browse_Graphic:
Browse_Graphic_File_Name: vaseds.jpg
Browse_Graphic_File_Description:
Image map showing extent and distribution of this data layer coverage
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Please review the cross reference information for the original data set credit to Byrne, et al, 1981.
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.3.0.800
Cross_Reference:
Citation_Information:
Originator: Robert J. Byrne
Originator: Carl H. Hobbs, III
Originator: Michael J. Carron
Publication_Date: 1981
Title:
Baseline Sediment Studies to Determine Distribution, Physical Properties, Sedimentation Budgets, and Rates in the Virginia Portion of the Chesapeake Bay,
Publication_Information:
Publication_Place: Gloucester Point, VA
Publisher:
Virginia Institute of Marine Science (VIMS), College of William and Mary
Online_Linkage:
<http://www.chesapeakebay.net/data/historicaldb/sedimentsmain.htm>
Online_Linkage: <ftp://ftp.chesapeakebay.net/Historical/Sediment/vased_sum.txt>
Data_Quality_Information:
Lineage:
Process_Step:
Process_Description:
Significant figures were reduced to 5 for location and to 2 for texture classes, grainsize bins, and statistics.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Reid
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 427-4727
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: jareid@usgs.gov
Process_Step:
Process_Description:
Values > 998 in statistics and ACU and CMP fields were removed, assuming they were null values.
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Reid
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 427-4727
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: jareid@usgs.gov
Process_Step:
Process_Description:
2nd moment measure was determined to be variance (not standard deviation) by comparing values to Folk Inclusive Graphic Standard Deviation. Variance values were converted to standard deviation (square root).
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Reid
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 427-4727
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: jareid@usgs.gov
Process_Step:
Process_Description:
Digital data were hand formatted into dbSEABED data entry structure, then filtered and data-mined through dbSEABED software (version: db9_MNEs.bas)
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jane Reid
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: USA
Contact_Voice_Telephone: (831) 427-4727
Contact_Facsimile_Telephone: (831) 427-4748
Contact_Electronic_Mail_Address: jareid@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 2161
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000000
Longitude_Resolution: 0.000000
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: vaseds
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: LATITUDE
Attribute_Definition: Latitude of coordinate description
Attribute_Definition_Source: Source report
Attribute:
Attribute_Label: LONGITUDE
Attribute_Definition: Longitude of coordinate description
Attribute_Definition_Source: Source report
Attribute:
Attribute_Label: SITENAME
Attribute_Definition: Survey or laboratory code for site
Attribute_Definition_Source: Data compiler
Overview_Description:
Entity_and_Attribute_Overview:
Two organic contents were given: TOTAL ORGANIC CARBON CONTENT (WT %.) and TOTAL ORGANIC CARBON (WT %.). Sulfur is TOTAL REDUCED SULFUR CONTENT (WT %.). Water content was put into wet water weight field (ACU; field 9) and water weights of zero ('0') removed as unlikely; all occurrences were at the end of the data set. There were many implausible MM3 (skewness) and MM4 (kurtosis) values >6. These were left as is. Eight analyses suspect as GSSC values don't match the GRZ bins The following fields were entered into the Acoustic Properties, Texture, Sediment Composition and Grain Size themes in dbSEABED: STATION ID CODE SiteName:Latitude [deg] #:Longitude [deg] #:::::Sampling Device::::::Province:Operator / Collector FGRSTD (FOLKS GRAPHIC STANDARD DEVIATION):FGRSKEW (FOLKS GRAPHIC SKEWNESS):SSK (unspecified SKEWNESS):XKK (unspecified KURTOSIS):MM+STD: STANDARD DEVIATION (2ND MOMENT MEASURE) (actually variance) Gravel [%] #:Sand [%] #:Silt [%] #:Clay [%] #::Median Grainsize [phi] #:MOMENT Mean Grainsize [phi] #:MOMENT Standard Deviation [phi] #::::::FOLK Inclusive Graphic Skewness [phi] #:FOLK Graphic (%5;%25;%75;%95) Kurtosis [phi] #:::Mode/s (phiM1 [%] ...) *::::::::::::::::::::::FOLK Inclusive Graphic (%16;%84;%95;%5) Std Dev [phi] #::::::MOMENT Skewness [phi] #:MOMENT Kurtosis [phi] #::FOLK (%16;%84;%50) Graphic Mean [phi] # 'total organic carbon content' (wt%): Organic Carbon (TOC; %) #:::::::::::::::::::::::Sulphur [%] #: Water / Wet Weight [%] # CWP_0200:CWP_0175:CWP_0150:CWP_0125:CWP_0100:CWP_0075:CWP_0050:CWP_0025:CWP0000:CWP0025:CWP0050:CWP0075:CWP0100:CWP0125:CWP0150::CWP0175:CWP0200:CWP0225:CWP0250:CWP0275:CWP0300:CWP0325:CWP0350:CWP0375:CWP0400:CWP0450:CWP0475:CWP0500:CWP0600:CWP0700::CWP0800:CWP0900:CWP1000:CWP1100:
Distribution_Information:
Resource_Description: Downloadable Data
Distribution_Liability:
Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. 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. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.186
Metadata_Reference_Information:
Metadata_Date: 20050525
Metadata_Review_Date: 20050504
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jamey Reid
Contact_Organization: U.S. Geological Survey
Contact_Position: IT Specialist (Data Management)
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 x2204
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: jreid@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_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.7.33 on Wed May 25 13:27:02 2005