water table

Marsh water table height, logging data from the Typha marsh site on the upper Parker River for March-September 2011.

Abstract: 

Measurements of water table height in the upper Parker River Typha sp. marsh. 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 Typha site, MAR-PR-Wtable-T, for March - September 2011.

Core Areas: 

Data set ID: 

204

Keywords: 

Short name: 

MAR-PR-Wtable-T-Mar2011

Purpose: 

 

Data sources: 

MAR-PR-Wtable-T-Mar2011_csv
MAR-PR-Wtable-T-Mar2011_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 5m 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 10 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) 1 (tide gauge) 0.00 -9.58 2 1 2.076 -1.40 3 2 2.533 0.00 4 3 3.082 1.52 5 4 3.207 3.99 6 5 3.323 21.55 Logger 1 tide gauge located on river bottom. Marsh wells 1-5, numbered consecutively moving upland. NOTES AND COMMENTS: Due to occasional equipment malfunction, readings are not continuous throughout the field season. Times in EST. Due to the storage size of the 5 minute logging data, 2 files were created to accomodate the amount of data and both files must be downloaded to get a complete 2011 years worth of data for the Typha water level site. Files needed: MAR-PR-Wtable-T-Mar2011 MAR-PR-Wtable-T-Sep2011

Maintenance: 

no new data for 2011, collection done Version 01: January 30, 2012, updated data and metadata. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 1/27/12 4:35 PM for QA/QC to EML 2.1.0 Version 02: June 4, 2013, data and metadata updated to comply with importation to Drupal and LTER PASTA. Research location name and description updated.Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 3/14/13 12:02 PM for QA/QC to EML 2.1.0

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