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:
Principal Investigator
Ecosystems Center
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 ID: | WAT-YSI-Urban-2006.01 |
| Dataset Title: | Year 2006, 15 or 30 minute measurements of stage in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA. |
| Investigator 1: | |
| First Name: | Charles |
| Last Name: | Vorosmarty |
| Address line 1: | Morse Hall |
| Address line 2: | UNH |
| Address line 3: | |
| City: | Durham |
| State: | NH |
| Zip Code: | 03824 |
| Country: | USA |
| Investigator 2: | |
| First Name: | Wilfred |
| Last Name: | Wollheim |
| Address line 1: | Morse Hall |
| Address line 2: | UNH |
| City: | Durham |
| State: | NH |
| Zip Code: | 03824 |
| Country: | USA |
| Associate Investigators: | |
| Keywords: | PIE LTER, Saw Mill Brook, suburban, discharge, water temperature, conductivity, pH, dissolved oxygen. |
| Abstract: | Continuous measurements, every 10-30 minutes, were made of stage in a small headwater stream draining a highly suburban catchment (72% residential). Some water temperature, conductivity, and dissolved oxygen numbers during the summer. 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 Email: pie_im@mbl.edu Online URL: http://ecosystems.mbl.edu/PIE/ |
| DATA FILE INFORMATION: | |
| Data File URL | http://ecosystems.mbl.edu/PIE/data/WAT/data/WAT-YSI-Urban-2006.dat |
| Data File Name | WAT-YSI-Urban-2006 |
| Beginning Date | 1/1/2006 |
| End Date | 12/31/2006 |
| Number of Data Records | 32753 |
| 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 loaded in September 2007. |
| RESEARCH LOCATION: | Site 1 |
| Geographic Description | YSI-SB |
| Location Bounding Box | |
| West Bounding Coordinate | |
| East Bounding Coordinate | |
| North Bounding Coordinate | |
| South Bounding Coordinate | |
| OR if single point location | |
| Latitude | 42.5236 |
| Longitude | -71.185 |
| Methods: | This file consists primarily of depth data collected using four approaches: 1) A hobo data logger temporarily deployed Jan 6 - March 8, 2006 (TEMP_HOBO), 2) A HOBO datalogger deployed in a stilling well from July 26th - Dec 31st 2006, 3) Sigma Autosampler Jan 1-2, 2006 and Mar 8 - Apr 22nd, 2006, 4) YSI depth sonde Apr 22nd - July 26th 2006. Depths were standardized to the YSI_Depth in order to create a consistent data set that is applied to the standard rating curve. Depth were standardized either using simultanous readings of the instrument, or by comparing instrument measurement and manual stage height reading at the YSI stilling well. YSI 6200 data sondes were deployed vertically in a pool deep enough to contain water during dry conditions. Discharge from Sigma depth measurements should be used with caution due to periodic unreliability of the readings. YSI: The YSI 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 poor quality because the the bottom of the pool was often filled in with detritus following intermediate sized storms, leading to anoxic conditions. To alleviate this problem, the PVC tube was raised 10.1 cm on 7/16/03. This file includes the raw depth measurement (RAWYSI_Depth), as well as the depth measurement corrected to the YSI depth after the change in tube height (YSI_Depth_STD). In this file they are the same (maintained from earlier years). 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 conducitivty and depth was performed roughly every 4-6 weeks. Instrument drift during deployment periods was not significant. SIGMA AUTOSAMPLER: Depth is recorded using a depth sonde integrated with the Sigma autosampler. Sonde was secured to cinder block driven into the stream bottom and the measured depth referenced to YSI depth. When available, YSI depth is used in preference to Sigma depth because the latter is less reliable. Sigma depth is referenced to YSI depth based on overlap of YSI and Sigma measurements, and using manual stage measurements at the YSI installation. Discharge using Sigma depth should be used with caution because of instrument problems and a less stable mount on the stream bottom, though an effort was made to provide a reasonable depth/discharge estimate that can be used to compare across instruments/times. Jan 1-2 2006. YSI_Depth = Sigma_Depth - 0.045. Mar 8 - Apr 22, 2006. YSI_Depth = Sigma_Depth + 0.0237 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. Between Jan and March 2006, a borrowed data logger was deployed attached to a cinder block placed on the stream bottom, but should give consistent measurements during the deployment.. A newly purchased HOBO data logger was deployed in a permanent stilling well in July 2006. The HOBO is deployed in a 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. The temporary HOBO is standardized to YSI depth using comparison with periodic stage height measured manually at the YSI stilling well: YSI_Depth = TEMP_HOBO - 0. 0582 The HOBO from July 26th on is deployed in a permanent stilling well, and is currently not yet benchmarked to the standardized 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 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. Discharge estimates in Saw Mill are based on a power rating curve that contains measurements up to a depth of 1 meter, which is above bankfull stage. Rating curve has an R2 of 0.96 using 24 measurements between 2001 and 2006. All files in this series (2001-2006) are currently standardized to YSI depth. Sigma Depth is also included here. A flow reading that was reported by the Sigma is also included. Sigma flow was calculated using a rating curve programed into the Sigma using an old rating curve. This is used for reference to the nutrient sampling performed by the Sigma when programmed under a flow-weighted program. The column Depth_Device is included when combining files from several years, over which several different devices were used to calculate depth. Depth_STD is the depth that is standardized across all measurement devices so that a single rating curve can be applied. CALCULATIONS: Discharge rating curve : Discharge (l/s) = 1818.4 (depth) ^ 3.8167 where depth is YSI_Depth_STD |
| Variable Name | Variable Description | Units | Measurement Scale | Code Infomation | 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:ss) 24 hour | datetime | hh:mm:ss | blank cell | ||||
| Temp | water temperature (oC) | celsius | interval | real | blank cell | |||
| SpCond | specific conductivity (mS/cm) | millisiemensPerCentimeter | ratio | real | blank cell | |||
| DO% | dissolved oxygen percent of saturation (%) | percent | ratio | real | blank cell | |||
| DOConc | dissolved oxygen concentration (mg/l) | milligramsPerLiter | ratio | real | blank cell | |||
| pH | log of the H+ ion concentration | dimensionless | ratio | real | blank cell | |||
| RAWYSI_Depth | stage height measured by YSI (m) | meter | ratio | real | blank cell | |||
| YSI_Depth_STD | stage height measured by YSI (m) (standardized) | meter | ratio | real | blank cell | |||
| SIGMA_DEPTH | stage height measured by Sigma (m) | meter | ratio | real | blank cell | |||
| SIGMA_FLOW | discharge using Sigma_Depth and old rating curve programmed into the Sigma | litersPerSecond | ratio | real | blank cell | |||
| HOBO_DEPTH | stage height measured by HOBO (m) | meter | ratio | real | blank cell | |||
| 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 | blank cell | ||||
| Depth_STD | depth standardized to rating curve | meter | ratio | real | blank cell | |||
| Discharge | discharge | litersPerSecond | ratio | real | blank cell |