disturbance

PIE LTER marsh water table height, logging data from the railroad Spartina marsh site on the Parker River, Newbury, MA, for April-November 2016.

Abstract: 

Measurements of water table height in the Parker River marsh located downstream of the railroad bridge. Measurements were taken every 5 minutes at each logger along a transect of water level loggers running perpendicular to the Parker River bank at the railroad site, MAR-PR-Wtable-RR for April-November 2016.

Core Areas: 

Data set ID: 

498

Keywords: 

Short name: 

MAR-PR-Wtable-RR-2016

Data sources: 

MAR-PR-Wtable-RR-2016_csv
MAR-PR-Wtable-RR-2016_xls

Methods: 

A transect of wells is established on the marsh platform, perpendicular to the marsh edge.  A total of 5 wells are dug to the depth of the water table under the marsh platform.  Wells 1 - 4 are spaced approximately evenly within the first 6m of marsh edge with well 5 approximately 20m upland from the marsh edge.  A water level logger, referred to as the tide gauge, (Onset HOBO U20 series) is placed at the river bottom directly in front of the transect . Individual water level loggers (Onset HOBO U20 series) are used in each well and they measure water height in terms of absolute pressure.  Barometric pressure is measured above ground with an additional Onset HOBO U20 series water level logger to tease out the atmospheric pressure from water column pressure.  Prior to deployment, each water level logger is sealed in protective plastic whirl-pak bags filled with freshwater, and calibrated to known water depths.  Once in the field, water height measurements, in terms of absolute pressure, are recorded every 5 minutes.  Pressure readings are uploaded from the HOBO water level loggers using HOBOware software which compensates for temperature, fluid density, and barometric pressure, then are converted to absolute water height above the river bottom.  Data is QA/QC'd to ensure that the loggers report the same flood water elevation on the marsh surface. The surface elevation of the marsh as measured by the marsh water level loggers must match that of the gps'd surface elevation.  Any corrections made to a particular logger data field (logger # Dc (m)) are reported in the Offset corr field (Offset corr logger # (m)).

 

Well Location Information:

Logger Well Height of Marsh Surface above Creek Bottom (m) Horizontal Distance Upland of Creek Edge (m)
7 (tide gauge)   0 -10.94
8 R1 2.744 0.000
9 R2 2.900 1.630
10 R3 2.947 3.73
11 R4 2.918 5.78
12 R5 2.920 18.86

Logger 7 tide gauge located on river bottom.

Marsh wells 9, 10, 11, 8 and 12, move from water edge into the marsh platform.

NOTES AND COMMENTS: Due to occasional equipment malfunction, readings are not continuous throughout the field season.  Times in EST.

Several problems with the data set from Apr 26, 2015 to July 6, 2015.  Ref logger 7 failed during deployment.  Battery and electronics need repair at Onset.  Data lost for this time series.  Loggers cannot be corrected to Vapp with this data missing.  RR well 1 (logger 8) developed a hole at the bottom of the well as the bank collapsed away.  Obvious data has been removed from this set (up until 6/1/15).  BARO logger  also failed during deployment.  Used baro logger from Forbrich Eddy flux tower as an alternative.  USE ALL DATA FROM THE DEPLOYMENT from Apr 26, 2015 to July 6, 2015 WITH CAUTION.  This data can be used for water heights but has not been corrected to the ref logger.

Well 1 (TG 8) collapsed during the winter.  The bottom leaked so the first data collected was not included in this data set.  Starting on July 7, 2015 Well 1 was removed and a new hole was drilled between 11 and 12.   The new well was referred to as 4a using logger 8.  The data should be in the correct order in this sheet.

Maintenance: 

No new data for 2016, collection done

Version 01: April 26, 2019, data and metadata updates to comply with importation to DEIMS7 and LTER Data Portal. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2018.xlsm 6/21/18 3:53 PM for QA/QC to EML 2.1.0

 

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