Acceptance and utilization of PIE-LTER data requires that:
· The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
· The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
· A copy of any resultant publications should be sent to:
(Principal Investigator)
Ecosystems Center;
Marine Biological Laboratory
Woods Hole, MA 02543
PLUM ISLAND ECOSYSTEM LTER DATABASE
DATA FILE: MAR-PR-Wtable-RRB-2001.txt
DOCUMENTATION FILE: MAR-PR-Wtable-RRB-2001.doc
YEAR: 2001
PI: Charles Hopkinson
OTHERS: Peter Raymond, Greg
Peterson, John Logan
BRIEF DESCRIPTION OF DATA FILE:
Readings of water table height, taken every 4 minutes, by a transect of water level loggers running perpendicular to the Parker River bank at Site RR for September-December 2001.
KEYWORDS: water table, porewater,
marsh, Parker, elevation
SITE TYPE: Marsh
RESEARCH LOCATION:
RR: Lower Parker river,
Spartina-dominated marsh edge, downstream of railroad bridge
Coordinates at edge of marsh
platform:
Latitude Longitude
|
42.75699458 |
-70.8635764 |
EXPERIMENTAL DESIGN AND METHODS:
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 |
1.0* |
-0.36 |
|
2 |
Pipe 3 |
2.4* |
0.21 |
|
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 an estimated distance
NOTES AND COMMENTS: Due to occasional equipment malfunction, readings are not continuous throughout the field season.
VARIABLE DESCRIPTION:
|
Name |
Description |
Unit |
Precision |
|
Time |
Date and minute of water table height measurement |
month/day/year, hour:minute |
|
|
Wy |
Height of water table above creek bottom at a given pipe location |
cm |
MPX5050: ~1cm MPX5100: ~2cm |
|
Pipe 1 |
Tide gauge, located at river bottom |
|
|
|
Pipe 2-7 |
Marsh wells 1-6, numbered
consecutively moving upland |
|
|
CALCULATIONS:
FOR MORE INFORMATION, CONTACT: Hap Garritt
OTHER DATA FILES TO REFERENCE:
REFERENCE CITATIONS:
DATA AVAILABILITY STATUS: Type 2
ARCHIVE INFORMATION:
Date of entry: January 23, 2004
Data entered by: Emily Gaines
Comments: