Acceptance and utilization of LTER data requires that:
(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) 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.
(3) A copy of any resultant publications should be sent to:
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543
|Dataset URLs:||METADATA: HTML, Rich Text, XML(EML compliant) |
DATA: Comma Delimited, Excel file with Metadata and data
|Dataset Title:||Year 2005, 15-30 minute measurements of stage, water temperature and conductivity in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Cr., Newbury, MA.|
|Investigator 1:|| |
|Address line 1:||Morse Hall|
|Address line 2:||UNH|
|Address line 3:|
|Keywords:||PIE LTER, disturbance, Parker River watershed, Cart Creek, forest, discharge, water temperature, water stage, conductivity|
|Abstract:||Continuous measurements, every 15-30 minutes, were made of stage, water temperature, conductivity, dissolved oxygen, and pH in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland). Discharge is determined from stage using discharge vs stage regressions. Several day gaps occur periodically due to removal for recalibration.|
|Contact:||Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL: http://ecosystems.mbl.edu/PIE/
|DATA FILE INFORMATION:|
|Data File URL||http://ecosystems.mbl.edu/PIE/data/WAT/data/WAT-YSI-Forest-2005.csv|
|Data File Name||WAT-YSI-Forest-2005|
|Number of Data Records||12531|
|Other Files to Reference||All in the YSI series.|
|Availability Status||Type 1|
|Quality Control Information|
|Maintenance Description||Periodic with improvement of rating curve, particularly as more high discharge events are incorporated.|
|Log of Changes:||This file was initially posted in September 2007.|
|Version 01, 30 Oct 2007 updated metadata to EML level 3+|
|Version 02, 21Jan2010 keyword update|
|Version 03, 15May2013, metadata and data updated to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 3/14/13 12:02 PM for QA/QC to EML 2.1.0|
|RESEARCH LOCATION:||WAT-PR-Newbury-CC||Site 2|
|Geographic Description||Watershed water collection and stream characterization site for Cart Creek (forest landuse), Newbury, MA|
|Location Bounding Box|
|West Bounding Coordinate|
|East Bounding Coordinate|
|North Bounding Coordinate|
|South Bounding Coordinate|
|OR if single point location|
YSI information is available from only a small portion of the year. Depth for most of the year is based on measurements by the sonde integrated with the Sigma Autosampler. When available discharge and stage is based on measurements by the YSI, as these are more reliable.
YSI: YSI 6200 data sondes were deployed vertically in a pool deep enough to contain water during dry conditions. The sonde was deployed in a PVC tube, which was attached to ree-bar driven into the stream bed. The PVC tube had holes drilled to allow adequate water circulation. Dissolved oxygen measurements are of good quality because detritus did not accumulate in the bottom of the pool (unlike our suburban site).
The PVC tube was surveyed upon original deployment in 2001 and resurveyed in 2002 to ensure that elevation did not change during winter ice period. No change was detected. No evidence of change has been noted through 2006 based on discharge measurements. See discussion below for development of the discharge-stage relationship.
Recalibration of oxygen, pH, conducitivty and depth was performed roughly every 4-6 weeks. Instrument drift during deployment periods was not significant.
SIGMA AUTOSAMPLER: Depth is also recorded at times using a depth sonde integrated with the Sigma autosampler. Sonde was secured to cinder block driven into the stream bottom and referenced to standardized depth. Discharge reported by the Sigma is included for when the autosampler was programmed to sample on a flow weighted basis. Sigma discharge is based on a rating curve programmed into the Sigma that is based on the old rating curve developed prior to 2004 and is therefore approximate.
When available, YSI depth is used in preference to Sigma depth to determine discharge because the latter is less reliable. Otherwise, Sigma is corrected to HOBO depth using the following relationships:
Jan-Feb 2005: YSI_Depth = Sigma_Depth - 0.032. HOBO_Depth = YSI_Depth + 0.17549
Mar-July 2005: YSI_Depth = Sigma_Depth - 0.012. HOBO_Depth = YSI_Depth + 0.17549
Discharge when Depth_Device = SIGMA should be used with caution because of instrument unreliability and the several conversions that are made to standardize the depth.
ADDITIONAL RESEARCH LOCATION COORDINATES: In addition to the decimal degree coordinates given above, locations are also given here in Massachusetts State Plane coordinates. The stream is called Cart Cr. and is located in Newbury MA. Some residential area is present. (~ 10% of the basin). In addition, I-95 passes through the center of the catchment, resulting in roughly 8% impervious surface area
STATION STATE X STATE Y
YSI-CC 247680 946790
NOTES AND COMMENTS:
Velocity measurements were made using a Marsh McBirney current meter. Discharge estimates in Cart Cr. are based on a power rating curve that contains measurements up to a depth of 0.8 meters, as standardized to depth measured with a HOBO datalogger (Column = HOBO_Depth), which is above bankfull stage. Rating curve has been standardized to HOBO_Depth to allow application of a single rating curve across years. Rating curve has an R2 of 0.96 using 32 measurements between 2001 and 2007. All files in this series (2001-2006) are currently standardized to HOBO_depth.
The column Depth_Device is included when combining files from several years, over which several different devices were used to calculate depth. HOBO_Depth is the depth that is standardized across all measurement devices so that a single rating curve can be applied.
Discharge rating curve :
Discharge (l/s) = 731.91 (depth) ^ 5.5172
where depth is HOBO_Depth
|Variable Name||Variable Description||Units||Measurement Scale||Code Information||Number Type||DateTime Format||Missing Value Code||Missing Value Code Explanation|
|Date||date (yyyy-mm-dd)||datetime||yyyy-mm-dd||NA||NA = not available|
|Time||time (hh:mm) 24 hour||datetime||hh:mm||NA||NA = not available|
|Temp||water temperature (oC)||celsius||interval||real||NA||NA = not available|
|SpCond||specific conductivity (mS/cm)||millisiemenPerCentimeter||ratio||real||NA||NA = not available|
|DO%||dissolved oxygen percent of saturation (%)||percent||ratio||real||NA||NA = not available|
|DOConc||dissolved oxygen concentration (mg/l)||milligramPerLiter||ratio||real||NA||NA = not available|
|pH||log of the H+ ion concentration||dimensionless||ratio||real||NA||NA = not available|
|YSI_Depth||stage height measured by YSI (m)||meter||ratio||real||NA||NA = not available|
|SIGMA_DEPTH||stage height measured by SIGMA (m)||meter||ratio||real||NA||NA = not available|
|SIGMA_FLOW||discharge using SIGMA_Depth and earlier rating curve (l/s)||literPerSecond||ratio||real||NA||NA = not available|
|HOBO_Depth||stage height standardized to HOBO depth (m)||meter||ratio||real||NA||NA = not available|
|Depth_Device||depth measurement device used to determine discharge||nominal||YSI = YSI depth sonde | SIGMA = Sigma autosampler depth sonde | TEMP_HOBO = HOBO depth sonde deployed in temporary stilling well | HOBO = HOBO depth sonde deployed in permanent stilling well||NA||NA = not available|
|Discharge||discharge||literPerSecond||ratio||real||NA||NA = not available|