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WAT-YSI-Urban-2002
Year 2002, 15 minute measurements of stage, water temperature, conductivity, dissolved oxygen, and pH in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
Wilfred
Wollheim
University of New Hampshire
(603) 862-5022
Wil.Wollheim@unh.edu
http://orcid.org/0000-0002-5009-3212
Plum Island Ecosystems LTER
http://pie-lter.ecosystems.mbl.edu/
Plum Island Ecosystems LTER
http://pie-lter.ecosystems.mbl.edu/
Brian
Pellerin
bpeller@usgs.gov
associated researcher
2004
English
Year 2002, continuous measurements, every 15 minutes, were made of stage, water temperature, conductivity, and dissolved oxygen in a small headwater stream, Saw Mill Brook, Burlington, MA, draining a highly suburban catchment (72% residential). Measurements are for part of the ice free season (June – December). Discharge is determined from stage using discharge vs stage regressions. Several day gaps occur periodically due to removal for recalibration.
Disturbance
Core Areas
dissolved oxygen
disturbance
discharge
Saw Mill Brook
suburban
water stage
ph
conductivity
water temperature
conductivity
PIE LTER
LTER Controlled Vocabulary
Data Policies
PIE LTER Data Use Agreement
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https://pie-lter.ecosystems.mbl.edu/content/year-2002-15-minute-measurements-stage-water-temperature-conductivity-dissolved-oxygen-and-1
Watershed water collection and stream characterization site for Saw Mill Brook (urban landuse), Burlington, MA
-71.184997558594
-71.184997558594
42.523601531982
42.523601531982
2002-03-22
2002-12-03
Periodic with improvement of rating curve, particularly as more high discharge events are incorporated.
This file was updated in September 2007 to incorporate an improved rating curve that includes higher discharge events. Flow data from previous version is maintained for comparison.
Version 01, 30 Oct 2007 updated metadata to EML level 3+
Version 02, 21Jan2010 keyword update
Version 03, 25May2010, date and rating curve data update, revised in 2009 to standardize YSI depths to HOBO datalogger depths used in later years - uses revised rating curve that includes all measurements between 2001 and 2009
Version 04: February 17, 2014, data and metadata updated to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007_Sep2013.xlsm 9/30/13 02:57 PM for QA/QC to EML 2.1.0
Plum Island Ecosystems LTER
http://pie-lter.ecosystems.mbl.edu/
Plum Island Ecosystems LTER
http://pie-lter.ecosystems.mbl.edu/
Plum Island Ecosystems
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 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. The file for 2001 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) and for which the rating curve has been standardized.
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, conducitivty and depth was performed roughly every 4-6 weeks. Instrument drift during deployment periods was not significant.
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:
Dissolved oxygen concentrations generally reflect water column levels. However, due to the position of the sonde, detritus periodically covered the bottom of the sondes where the D.O. probe is located, leading to anoxic conditions. It is likely that low D.O. levels reflect benthic conditions.
Velocity measurements were made using a Marsh McBirney current meter and starting in 2009 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 0.89 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).
CALCULATIONS:
Discharge rating curve :
Discharge (l/s) = 889.65*depth^5.8788
where depth is Adj_HOBO_Depth
Several depth are included in this file to allow comparison with earlier file version. RAWYSI_Depth is the depth measured by the YSI and is used by an initial, preliminary rating curve. YSI_Depth_STD is depth adjusted to standardize for the change in stilling well depth in July 2003. 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. The rating curve is standardized to the Hobo depth measurements, which were started in 2006. The difference between Hobo data logger depth measurements and YSI data logger depth measurements (YSI_DEPTH_STD) is 0.211m
(StandardizedHoboDepths = YSI_Depth_STD + 0.21)
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.
OLD RATING CURVE ( prior to Sept 2009 revision):
Discharge measurements in Saw Mill are based on a power rating curve that contains measurements up to a depth of 0.6m (using the column RAWYSI_Depth). Flows above this amount are estimated using a linear extrapolation using the six measurements with the highest flow. Thus flows determined from levels greater than 0.6m are approximate (roughly 1% of the readings in 2001 deployment period). Rating curve below 0.6m is based on a power relationship with an R2 = 0.98. Measurements are based on 12 measurements taken between 2001 and 2003.
OLD CALCULATIONS:
When stage in SawMill Br. is less than 0.6m :
Discharge (l/s) = 1245.2 (depth) 4.782
When stage in SawMill Br. is greater than 0.6m :
Discharge (l/s) = 560.7 (depth) – 229.8
WAT-YSI-Urban-2002_csv
Year 2002, 15 minute measurements of stage, water temperature, conductivity, dissolved oxygen, and pH in a small headwater stream draining a highly suburban catchment (72% residential), Saw Mill Brook, Burlington, MA.
WAT-YSI-Urban-2002_0.csv
1944002
33828811697199d4913dc405fa9fc71d
ca2833a13704c2ce6d7b4b8520b363c9f1ee8235
1
0
column
,
https://pie-lter.ecosystems.mbl.edu/sites/default/files/data/WAT-YSI-Urban-2002_0.csv
Date
Date
date (yyyy-mm-dd)
date
yyyy-mm-dd
NA
missing
Time
Time
time (hh:mm:ss) 24 hour
date
hh:mm:ss
NA
missing
Temp
Temp
water temperature (oC)
celsius
real
NA
missing
SpCond
SpCond
specific conductivity (mS/cm)
millisiemenPerCentimeter
real
NA
missing
DO%
DO%
dissolved oxygen percent of saturation (%)
percent
real
NA
missing
DOConc
DOConc
dissolved oxygen concentration (mg/l)
milligramPerLiter
real
NA
missing
pH
pH
log of the H+ ion concentration
dimensionless
real
NA
missing
RAWYSI_Depth
RAWYSI_Depth
stage height measured by YSI (m)
meter
real
NA
missing
YSI_Depth_STD
YSI_Depth_STD
stage height measured by YSI (m) (standardized)
meter
real
NA
missing
OLD-Discharge
OLD-Discharge
discharge using OLDYSI_Depth and earlier rating curve (l/s)
literPerSecond
real
NA
missing
Device_Depth
Device_Depth
depth measurement device used to determine discharge
string
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
missing
StandardizedHoboDepths
StandardizedHoboDepths
depth standardized to rating curve using HOBO depths
meter
real
NA
missing
Discharge
Discharge
discharge
literPerSecond
real
NA
missing
WAT-YSI-Urban-2002_xls
Excel metadata and data file associated with the csv data source file. Excel file after downloading is to be used for adding/editing new metadata and data.
WAT-YSI-Urban-2002.xls
6502400
a1de2c7307a6743b282b9348e728beae
21b32c0790dbfd284e2fb342c2dbf007bde46cc8
application/vnd.ms-excel
https://pie-lter.ecosystems.mbl.edu/sites/default/files/data/WAT-YSI-Urban-2002.xls
document
A common unit of temperature
millisiemen per centimeter, electrolytic conductivity of a solution
ratio of two quantities as percent composition (1:100)
milligrams / liter
a designation asserting the absence of an associated unit
SI unit of length
liters per second