porewater

Marsh water table height, logging data from the Typha marsh site on the upper Parker River for April-November 2015.

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 April - November 2015

Core Areas: 

Data set ID: 

406

Keywords: 

Short name: 

MAR-PR-Wtable-T-2015

Purpose: 

 

Data sources: 

MAR-PR-Wtable-T-2015_csv
MAR-PR-Wtable-T-2015_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                                                                                       
2                           1                                           2.848                                                                                       
3                           2                                           3.006                                                                                       
4                           3                                           3.058                                                                                       
5                           4                                           3.066                                                                                       
6                           5                                           3.091                                                                                        

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.

Loggers five and six switched in the field 6 from 4/27/15 to 7/6/15 . They are correct on this sheet . Logger 6 fell from line during deployment.  I'm not including in final data for logger 6 from 4/27/15 to 7/6/15 .

Loggers not restarted for 4 and 5  during the 7/8/15 to 9/2/15 deployment.  Data not included in this sheet.

 

Maintenance: 

no new data for 2015, collection done Version 01: February 19, 2016, data and metadata created to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Jan2015.xlsm 1/15/15 4:26 PM for QA/QC to EML 2.1.0

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