Measurements of water table height in the upper Parker River Typha sp. marsh. Measurements were taken every 10 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 June - December 2003.
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 placed within the first 6m of shore, with well 5 more than 20m upland from the marsh edge. A tide gauge is placed at the river bottom directly in front of the transect. Individual pressure transducers (Motorola MPX series) are used in each well (MPX5050) and in the tide gauge (MPX5100) at the river bottom to measure water height in terms of pressure. Prior to deployment, each transducer is calibrated to determine the correlation between voltage output and water height. Once in the field, water height measurements, in terms of voltage, are recorded every 10 minutes by a HOBO H8 4-Channel External Data Logger (Onset Computers). Voltage readings are uploaded from the HOBO and are then converted to absolute water height above the river bottom.
Well Location Information:
Well ID Height of Marsh Surface Above Creek Bottom (m) Horizontal Distance Upland of Creek Edge (m)
1 Pipe 2 1.60 0.69
2 Pipe 3 2.14 2.22
3 Pipe 4 2.27 3.83
4 Pipe 5 2.44 6.18
5 Pipe 6 2.50 24.05
Pipe 1 tide gage 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. Some water heights for the tide gauge (pipe 1) are negative, due to the correction factor used to calibrate the loggers. These negative values should be considered as a water height of zero.
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