Measurements of water table height in the Parker River marsh located downstream of the railroad bridge. Measurements were taken every 4 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 May - August 2002.
A transect of wells is established on the marsh platform, perpendicular to the marsh edge. A total of 6 wells are dug to the depth of the water table under the marsh platform. Wells 1-5 are spaced approximately evenly within the first 3m of shore, with well 6 approximately 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 4 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 1.04 -0.4* 2 Pipe 3 2.42 0.2* 3 Pipe 4 2.53 1.16 4 Pipe 5 2.63 1.74 5 Pipe 6 2.73 2.61 6 Pipe 7 2.89 22.61 An asterisk (*) indicates estimated distances Pipe 1 tide gage located on river bottom. Marsh wells 1-6, numbered consecutively moving upland. NOTES AND COMMENTS: Due to occasional equipment malfunction, readings are not continuous throughout the field season.
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