Tide Data for Hog Island (1991-), Redbank (1992-), Oyster (2007-)

Summary Information
Data Package General Information:
Local Identifier: knb-lter-vcr.61.28
Title: Tide Data for Hog Island (1991-), Redbank (1992-), Oyster (2007-)
Alternate Identifier: VCR97053
Alternate Identifier: doi:10.6073/pasta/c7d08f79c1a87aef78c506a87ce15d83
Abstract:

Tide data from VCR/LTER tide stations. It is available as a single large comma-separated-value file (size >50MB) or as individual years.

Zip files contain annually-segmented data in two forms. The file tideYY.dat contains the data for year YY in a column format. The file tideYY.csv contains the same data in a comma-delimited format.

For several sites and time periods, water temperatures are also recorded.

Publication Date: 2017-12-31

Time Period
Begin:
1991-09-27
End:
2017-12-31

People and Organizations
Contact: Porter, John  [  email ]
Contact: Information manager - Virginia Coast Reserve Long-Term Ecological Research Project [  email ]
Creator: Porter, John 
Creator: Krovetz, David 
Creator: Spitler, James 
Creator: Spitler, James 
Creator: Williams, Thomas 
Creator: Overman, Kathleen 

Data Entities
Data Table Name:
VCR97053_1
Description:
Tide Data for Hog Island (1991-), Redbank (1992-), Oyster (2007-)
Other Name:
VCRTide_Yearly_CSV.zip
Description:
Annual tide data for all stations at the VCR/LTER in comma-separated-value formats
Other Name:
VCRTide_Yearly_dat.zip
Description:
Annual tide data for all stations at the VCR/LTER in fixed column formats. Year is indicated by the trailing two digits for each file.
Detailed Metadata

Data Entities


Data Table

Data: https://pasta.lternet.edu/package/data/eml/knb-lter-vcr/61/28/3b20e41c3c4d103948d2a12cb9398a35
Name: VCR97053_1
Identifier: VCR97053_1
Description: Tide Data for Hog Island (1991-), Redbank (1992-), Oyster (2007-)
Number of Columns: 6

Table Structure
Object Name: VCRTide.csv
Character Encoding: ASCII
Text Format:
Number of Header Lines: 22
Number of Foot Lines: 0
Record Delimiter: #x0A
Line Delimiter: #x0A
Orientation: column
Simple Delimited:
Field Delimiter: ,
Quote Character: "
Literal Character: \

Table Column Descriptions
  Location of sampling Date of data collection Time of data collection (Eastern Standard Time) Relative tide level Water Temperature Barometric Pressure (mm of mercury)
Column Name: STATION  
DATE  
TIME  
RELTIDE  
WTEMP  
BAROM  
Definition: STATION - Location of sampling DATE - Date of data collection TIME - Time of data collection (Eastern Standard Time) RELTIDE - Relative tide level WTEMP - Water Temperature BAROM - Barometric Pressure (mm of mercury)
Storage Type: string  
string  
integer  
float  
float  
float  
Measurement Type: nominal dateTime interval interval interval interval
Measurement Values Domain:
Allowed Values and Definitions
Enumerated Domain  
Code Definition
Code HOG2
Definition Hog Island under dock of Machipango Station in tidal creek
Source
Code Definition
Code HOGI
Definition Hog Island in channel near Machipango Station on N. end
Source
Code Definition
Code REDB
Definition Redbank, VA in Redbank Creek in front of Roland Rux house
Source
Format DDWWWYYYY
Precision
Unit HHMM
Type integer
Min
Max 2400 
Unit m
Type real
Min
Max
Unit degrees C
Type real
Unit mm
Type real
Missing Value Code:      
Code .
Expl missing
Code .
Expl missing
Code .
Expl missing
Accuracy Report:            
Accuracy Assessment:            
Coverage:            
Methods:       Method Info Method Info Method Info

Non-Categorized Data Resource

Name: VCRTide_Yearly_CSV.zip
Entity Type: file
Identifier: VCR97053_2
Description: Annual tide data for all stations at the VCR/LTER in comma-separated-value formats
Physical Structure Description:
Object Name: VCRTide_Yearly_CSV.zip
Character Encoding: Binary
Externally Defined Format:
Format Name: zip
Data: https://pasta.lternet.edu/package/data/eml/knb-lter-vcr/61/28/6d40dc1f15606407500314e440ec9f3e

Non-Categorized Data Resource

Name: VCRTide_Yearly_dat.zip
Entity Type: file
Identifier: VCR97053_3
Description: Annual tide data for all stations at the VCR/LTER in fixed column formats. Year is indicated by the trailing two digits for each file.
Physical Structure Description:
Object Name: VCRTide_Yearly_dat.zip
Character Encoding: Binary
Externally Defined Format:
Format Name: zip
Data: https://pasta.lternet.edu/package/data/eml/knb-lter-vcr/61/28/200cc5750e6f2f84de2b264f31646525

Data Package Usage Rights

Data License

This data is released under a CC-BY Attribution license (https://creativecommons.org/licenses/by/4.0/)

The consumer of these data ("Data User" herein) has an ethical obligation to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or coauthorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
LTERCoreAreas Disturbance
VCRLTERCoreAreas System State/Condition
(No thesaurus) tides, water temperature, barometric pressure, water level

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Protocols and/or Procedures
Description:

This section contains methods for the general project.

Goals for project WKN7S8803 -->

This section contains a progress report on the general project.

Memo Text for project WKN7S8803 -->

05/01/89:

Weather station component sensors and recorders were ordered and received. Sensor systems were assembled and interfaced with data loggers. An extensive bench program of sensor quality control and trouble-shooting was implemented. Instrument shelters were constructed. Sensor platforms were erected in the field. Data management and maintenance protocols were developed. Sensors were installed in the field in winter 1989. Routine data collection began in spring 1989.

Meteorological stations will provide continuous monitoring of wind speed and direction, temperature, humidity, pressure, precipitation, short wave radiation, and photosynthetically active radiation. All parameters, except pressure will be observed with automated sensors and the data will be logged by a Campbell data logger and recorded on a cassette tape. Due to high cost of the sensor, atmospheric pressure will be sensed by an analog device with data recorded on paper charts and digitized for archival storage. Power will be provided by a 12V lead-acid car battery. The power supply needs to be fully contained within the sensor shelter to minimize the exposure of the sensor array to lightening strikes. Propane gas heaters (a simple pilot light burner) may be necessary to maintain the data loggers at operating temperature during the winter months.

Tide gages component sensors and recorders were ordered. The Phillips Creek tide station was activated in summer 1988. The Machipongo Station gage will be activated in spring 1989.

The tide gages consist of Stevens type 71A water level recorders providing a long-period paper record of water level fluctuations. No power is required to run the Stevens recorder. A float in a stilling well will be used as the sensor at the relatively stable, protected Phillips Creek monitoring site. A bubbling orifice and servo-manometer will be used as the water level sensor at the Machipongo Station. Nitrogen is slowly bled out of a compressed gas tank into the water column, and changes in the depth of water areas read as changes in the gas pressure needed to maintain a constant rate of gas flow. The bubbling orifice and servo-manometer configuration is expected to mitigate the effects of high siltation rates at the north end of Hog Island. The Stevens recorder and the servo-manometer will be located inside of the Machipongo Station on Hog Island.

Both the tidal and meteorological instrumentation will be visited once a week for maintenance and data collection.

This section contains specific methods for this dataset.

Data were automatically collected every 12 minutes using a variety of technologies. Stevens bubble gauges were used from 1991-1994 when they were replaced by Metritape tape loggers. These were then replaced with vented pressure sensors. Starting in 2011 the tide gauges were replaced with radar sensors that are suspended above the water. Starting in 2015 some stations were upgraded to collect 6-minute data to facilitate sharing with NOAA.

The Oyster station is best tied to external datums. The dock to which it was attached was constructed to be 1.64 meters (5 feet) above MSL. The radar gauge was calibrated using a staff gauge attached to the dock a measured distance below the top.

Due to changes in the landscape caused by accretion of Hog Island a sequence of gauges were used, starting with a Stevens bubble gauge attached to a pole driven into the lagoon. However repeated problems with the pole being ripped out by ice led to the use of a metritape gauge attached to the dock of the Machipongo Station. During this time a GPS benchmark using NAVD88 to the nearest 1/10 of a foot was established on the dock of the Machipongo Station. This was used to place a staff gauge (i.e.,ruler) on the Machipongo station dock.However, this location did not have deep enough water, so subsequently the Hog3 station was established on a pole in a tidal creek approximately 50 meters upstream from the Machipongo Station. Using the water level to connect them, a second staff gauge was added to a piling visible from the webcam on Machipongo Station approximately 50 meters upstream from the dock at the site of the short-lived Hog3 gauge. Webcam images were used to related Hog3 measurements to the staff guage. When the Hog4 gauge was established, the webcam was used to relate the level on the staff near the Machipongo Station to the radar gauge at the Hog4 station and used to set the 0-level on the Hog4 gauge.

The Redbank tide station used metritape and a series of pressure-guages, prior to installation of a radar guage.

These methods, instrumentation, and/or protocols apply to the data table VCR97053_1:

These methods, instrumentation and/or protocols apply to the data table column: Relative tide level (RELTIDE)
Protocols and/or Procedures
Description:

Relative tides are calculated relative to the position of the sensor and are not explicitly tied to an external datum. However, some data does exist for adjusting the relative tide to obtain standardized tide

data. That information is listed below by station.

HOGI Station - from Marcio Santos

CONVERTING RELATIVE TIDAL HEIGHT READINGS INTO USGS 1967 REDUCTION LEVEL 




Tidal height readings, performed at a staff gauge or automatic
tidal station, are usually relative readings (in the sense
that all readings are relative to an arbitrarily set "zero" level). 


Relative readings may be used in tide harmonic analysis and prediction. 



However, if the data is to be used in coastal environmental studies
(tidal flooding frequency, plant zonation boundaries, computation of
tidal datums, etc.), then the relative "zero" of the tidal station will 
have to be tied to a known topographic datum. 


The correction figures listed below convert relative tidal readings
into USGS 1967 reduction level. There are several corrections because
a new one is necessary every time the tide recording equipment
undergoes maintenance work or replacement. 


HOG ISLAND 


Subtract the following figures from the relative tidal data: 


before September 1993                                   2.197
September 1993 through January 1994                     1.862
February 1994 through October 1994                      2.260 

 
TIDAL DATUMS 


The computation  of topographic datums using tidal station data provides 
VCR-LTER researchers with standard topographic levels for use in plant zonation 
and geology surveys, tidal flooding frequency studies etc. 


Tidal datums are being provided for Hog Island and Quinby
(at the mainland). Red Bank is not tied to the USGS net yet. However,
Quinby datums could be used as a good aproximation for those working
at Bronwsville and Phillips Creek. 


The barrier inslands benchmarks were tied to mainland USGS
benchmarks using Survey Grade GPS. In the specific case of Hog Island, 

benchmark FARL was tied to USGS Kiptopeake benchmark. The calculation
of the USGS level of FARL uses the USGC level of Kiptopeake adding the 

relative difference between Kiptopeake and FARL.  The USGS level for
FARL, which is being used for all the Hog Island calculations, is
1.230 meters.  Because their relative difference did not change with
the most recent adjustments, the above datum is still valid. 


The tables below list levels and ranges. A level is a topographical height 
(in this case, height above the USGS 1967 reduction level). The level is 
calculated adding (or subtracting) half of a selected amplitude to the Half 
Tide Level(field data based Half Tide level). A range is the amplitude between 
the selected high and low tide levels. 


Two categories of levels and ranges are listed. The first is comprised 

by those tidal datums calculated directly from field tidal heights
(field data from the installed maregraphs and indicated in the table as 
FD). 


The second category is made by the datums that were estimated using harmonic 
constants (H) (which were also calculated from field tidal heights). 


Datums computed from harmonic constants estimate a tidal level which
is determined only by the gravitational effects of moon and sun. In other 
words, they do not take into account daily and seasonal changes in sea level 
or wind effects. In the other hand, the datums based on field data do take 
into account meteorological and sea-level changes effects. 


Hourly tidal data from September through December 93 was used in the
datum calculation for both sites. 

All figures are in meters. 


HOG ISLAND DATUMS 


Mean Tide Range (FD) (m) 1.190
Mean Tide Range ( H)  (m) 1.050 
Mean Neap Tide Range (H)  (m) 0.819 
Mean Spring Tide Range (H) (m) 1.263 
Mean Apogean Tide Range (H) (m) 0.897 
Mean Perigean Tide Range (H) (m) 1.235 
Mean Tide Level (FD) (m) 0.282 
Halt Tide Level   (FD) (m) 0.256
Halt Tide Level (H)  (m) 0.279 
Mean Low Tide Level (FD) (m) -0.339
Mean High Tide Level (FD)  (m) 0.851 
Mean High Water Neap Tide Level (H) (m) -0.665 
Mean High Water Apogean Tide Level (H) (m) -0.705 
Mean High Water Spring Tide Level (H) (m) -0.887 
Mean High Water Perigean Tide Level (H) (m) -0.873 
Mean Higher High Water Spring (H) (m) 0.990 
Mean Extreme Astronomical High Tide Level (H) (m) 1.165 
Mean Low Water  Neap Tide Level (H) (m) -0.153 
Mean Low Water  Apogean Tide Level (H) (m) -0.193 
Mean Low Water  Spring Tide Level (H) (m) -0.375 
Mean Low Water  Perigean Tide Level (H) (m) -0.361 
Mean Lower Low Water Spring Tide Level(H) (m) -0.478 
Mean Extreme Astronomical Low Tide Level (H) (m) -0.499 


REDB - from Trine Christiansen 11/20/97

The adjustment factor I use for Redbank is rbtide=1.08*reltide-1.99. This provide water level in meters above sea-level. I have correlated this calibration with the verified Wachapreague data, and end up with a difference of 3 cm for mean sea level.

HOG2 - Preliminary GPS data from Randy Carlson

The GPS elevation established on the dock adjacent and above the Hog Island Tide Gauge is as follows:

-36.56402 meters below the ellipsoid - - - - -or - - - - - 0.4841 meters

above Mean Sea Level.

John Porter took ten paired readings of the distance from the edge of the dock measured by R. Carlson to the water surface and the reading of the HOG2 tide guage. When regressed against one another, the intercept (indicating the distance between the 0 point on the tide guage and the top of the dock) was 2.383 m (full model distance below dock= 2.383 - 1.0861* reltide, r2=0.999). This indicates that the 0 point of the relative tide for HOG2 is 0.484 - 2.383 = -1.901. Thus, tide= 1.081*reltide-1.901 m is the tide level relative to mean sea level. Note that there are several sources of imprecision in this analysis. The GPS sea level is on the VCR1 monument, which has elevation measured only to the nearest 0.1 m. There is also some level of uncertainty added by the GPS measurements between the VCR1 monument and the dock (in the range of 2-5 cm). Finally, the HOG2 tide station is located on a tidal creek which may drain completely at less than full low tide.

These methods, instrumentation and/or protocols apply to the data table column: Water Temperature (WTEMP)
Protocols and/or Procedures
Description:

Water temperature is only available for the Redbank tide station.

These methods, instrumentation and/or protocols apply to the data table column: Barometric Pressure (mm of mercury) (BAROM)
Protocols and/or Procedures
Description:

Barometric pressure is only available for the HOGI and HOG2 stations. Note that a single barometer is shared by the two stations.

People and Organizations

Publishers:
Organization: Virginia Coast Reserve Long-Term Ecological Research Project
Address:
Department of Environmental Sciences, University of Virginia, 291 McCormick Road, PO Box 400123,
Charlottesville, VA 22904-4123 USA
Phone:
434-924-7761 (voice)
Phone:
434-982-2137 (facsimile)
Web Address:
http://www.vcrlter.virginia.edu
Creators:
Individual: John Porter
Address:
UVA, Department of Environmental Sciences, 291 McCormick Road, P.O. Box 400123,
Charlottesville, VA 22903-4123 USA
Phone:
434-924-8999 (voice)
Phone:
434-982-2137 (facsimile)
Email Address:
jhp7e@virginia.edu
Id: jporter
Id: http://orcid.org/0000-0003-3118-5784
Individual: David Krovetz
Address:
Department of Environmental Sciences, Clark Hall, University of Virginia,
Charlottesville, VA 22903 USA
Phone:
804-924-6546 (voice)
Phone:
804-982-2137 (facsimile)
Email Address:
dok2p@virginia.edu
Id: dkrovetz
Individual: James Spitler
Address:
Virginia Coast Reserve LTER Laboratory,
Oyster, VA 23419
Phone:
(804) 331-4323 (voice)
Email Address:
jrs4u@virginia.edu
Id: jspitler
Individual: James Spitler
Address:
Virginia Coast Reserve LTER Laboratory,
Oyster, VA 23419
Phone:
(804) 331-4323 (voice)
Email Address:
jrs4u@virginia.edu
Id: jspitler
Individual: Thomas Williams
Phone:
804-241-0598 (voice)
Email Address:
tom@airnetworking.com
Id: twilliams
Individual: Kathleen Overman
Address:
31559 Pennyville Road,
Painter, VA 23420
Phone:
757-331-4393 (voice)
Email Address:
kmo8t@virginia.edu
Id: koverman
Contacts:
Individual: John Porter
Address:
UVA, Department of Environmental Sciences, 291 McCormick Road, P.O. Box 400123,
Charlottesville, VA 22903-4123 USA
Phone:
434-924-8999 (voice)
Phone:
434-982-2137 (facsimile)
Email Address:
jhp7e@virginia.edu
Id: jporter
Id: http://orcid.org/0000-0003-3118-5784
Position: Information manager - Virginia Coast Reserve Long-Term Ecological Research Project
Address:
Department of Environmental Sciences, University of Virginia, 291 McCormick Road, PO Box 400123,
Charlottesville, VA 22904-4123 USA
Phone:
434-924-8999 (voice)
Phone:
434-982-2137 (facsimile)
Email Address:
jporter@lternet.edu
Web Address:
http://www.vcrlter.virginia.edu/jhp7e.html
Metadata Providers:
Organization: Virginia Coast Reserve Long-Term Ecological Research Project
Address:
Department of Environmental Sciences, University of Virginia, 291 McCormick Road, PO Box 400123,
Charlottesville, VA 22904-4123 USA
Phone:
434-924-7761 (voice)
Phone:
434-982-2137 (facsimile)
Web Address:
http://www.vcrlter.virginia.edu

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period
Begin:
1991-09-27
End:
2017-12-31
Geographic Region:
Description: Hog Island near Machipango Station, Redbank VA near private docks near public boat ramp, Oyster VA on ABCRC dock
Bounding Coordinates:
Northern:   38 Southern:   37
Western:   -76 Eastern:   -75.3
Altitude Minimum: -2 Altitude Maximum: 10
Sampling Site: 
Description: MACHSTA - Machipongo Station, Hog Island, VA
Site Coordinates:
Longitude (degree):  -75.67520141601562 Latitude (degree):  37.4525123746088
Sampling Site: 
Description: OS - Oyster Harbor
Site Coordinates:
Longitude (degree):  -75.923545553 Latitude (degree):  37.2889694
Sampling Site: 
Description: REDBANK - Red Bank, VA
Site Coordinates:
Longitude (degree):  -75.841874 Latitude (degree):  37.444580

Maintenance

Maintenance:
Description:

Data are updated as needed

Frequency: asNeeded

Additional Info

Additional Information:
 

Relevant URLs

  1. VCR LTER Tide Page) URL=http://www.vcrlter.Virginia.EDU/data/metdata/tide/index.html
  2. Tide and Meterological Station Manual) URL=http://www.vcrlter.virginia.edu/monitoring/monitor.html

Other Metadata

Additional Metadata

additionalMetadata
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        |     |     |        \___attribute 'id' = 'mm'
        |     |     |___text '\n      '
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Additional Metadata

additionalMetadata
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        |     |___element 'localtags'
        |     |     |___text '\n        '
        |     |     |___element 'system'
        |     |     |     |___text 'VCRLTER'
        |     |     |___text '\n        '
        |     |     |___element 'weight'
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        |     |     |___text '\n        '
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Download as XML (in Ecological Metadata Language)
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