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 2009, 15 minute measurements of stage in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.|
|Investigator 1:|| |
|Address line 1:||Morse Hall|
|Address line 2:||UNH|
|Address line 3:|
|Keywords:||PIE LTER, disturbance, Saw Mill Brook, suburban, discharge, water temperature, water stage.|
|Abstract:||Continuous measurements, every 15 minutes, were made of depth and stream temperature in a small headwater stream draining a highly suburban catchment (72% residential). Discharge is determined from stage using discharge vs stage regressions.|
|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-Urban-2009.dat|
|Data File Name||WAT-YSI-Urban-2009|
|Number of Data Records||28146|
|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:||Version 01created January 2010|
|RESEARCH LOCATION:||Site 1||Site 2|
|Location Bounding Box|
|West Bounding Coordinate|
|East Bounding Coordinate|
|North Bounding Coordinate|
|South Bounding Coordinate|
|OR if single point location|
|Methods:||This file consists of depth data collected using a HOBO datalogger deployed in a stilling well in the stream channel. |
HOBO Datalogger: Depth and water temperature are recorded by the HOBO data logger. Depths are corrected for barometric pressure changes using readings in an additional HOBO datalogger deployed at Marshview Farm. The HOBO is deployed in a PVC tube, which was attached to ree-bar driven into the stream bed. The PVC tube has holes drilled to allow adequate water circulation.
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 SawMill Br. and is located in Burlington MA. Small amounts of forest remain (~14% in 1999), much of which is along the stream channel near the gaging site.
STATION STATE X STATE Y
YSI-SB 225840 919310
NOTES AND COMMENTS:
Velocity measurements were made using a Marsh McBirney current meter. Starting in 2010, discharge measurements are being made with a Sontek FlowTracker. Discharge estimates in Saw Mill are based on a power rating curve that contains measurements up to a stage depth of 1.2 meters, which is above bankfull stage. Rating curve has an R2 of 0.88 using 40 measurements between 2001 and 2009. The rating curve has not noticeably changed over the period. Prior to 2007, stage was measured with various other instruments (YSI, Sigma depth sonde, HOBO). All files in this series (2001-2009) are now standardized to HOBO depth. The rating curve is based on the standardized HOBO depth's (and actual HOBO depths since 2007).
Discharge rating curve :
Discharge (l/s) = 896.47*depth^5.7352
where depth is Adj_HOBO_Depth
Adj_Hobo_Depth is a corrected HOBO depth that represents the true hobo depth (StandardizedHoboDepths in previous years). We started having problems with sand accumulation in the stilling well, and following downloads, redeployment of the HOBO caused it to sit on top of the sand. Manual measurements of water depth were used to make the correction. Starting in 10/21/09, we plan on preventing this from happening any longer. The following corrections were applied:
1. 2006-07-26 - 2007-04-03: 0 m
2. 2007-04-03 - 2007-04-18: 0.035 m
3. 2007-04-18 - 2007-05-23: 0.055 m
4. 2007-05-23 - 2008-06-06: 0.072 m
3. 2008-06-06 - 2009-01-14: 0.0446 m
4. 2009-01-14 - 2009-10-21: 0.0957 m
5. 2009-10-21 - yyyy-mm-dd: 0
Adj_HOBO_Depth is equivalent to StandardizedHoboDepths in previous years.
Also, at times depth and discharge may be periodically erroneous due to leaf pack accumulation at a riffle downstream causing backup. We remove this whenever we visit the site. Generally we believe the depth error is on the order of 2-4 centemeters. The depth data have not been corrected for errors associated with temporary debris dams. In 2009, leaf pack was removed on the following dates: 9/28/09 (2 cm change, not adjusted in our data), 10/21/09, 11/14/09, 12/12/09.
|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||blank cell|
|Time||time (hh:mm))||datetime||hh:mm||blank cell|
|Temp||water temperature (oC)||celsius||interval||real||blank cell|
|HOBO_DEPTH||stage height measured by HOBO (m)||meter||ratio||real||blank cell|
|Adj_HOBO_Depth||HOBO depth + CorrectionFactor (see methods)||meter||ratio||real||blank cell|
|Depth_Device||depth measurement device used to determine discharge||nominal||HOBO = HOBO depth sonde deployed in permanent stilling well||blank cell|