Uncertainty analysis of stage-discharge rating curves for seven rivers at Calvert Island (2013-2015)

Technical report on the development of stage-discharge rating curves for seven rivers draining into Kwakshua Channel (Calvert Island, BC, Canada) and a methodology on discharge uncertainty quantification. The aim of this study was to develop rating curves for seven watersheds in the bog forest environment of Calvert Island, British Columbia, Canada and to investigate the uncertainties related to rating curve development and discharge estimation using the velocity-area and salt dilution discharge measurement methods. Rating curves with 99% confidence intervals were created with good curve fitting results (R2 > 0.97) for three out of seven watersheds. Discharge measured with the velocity-area method had a higher average uncertainty (13.5 – 15.6%) compared to the salt dilution method (5.1%). The largest source of error for the velocity-area method was the uncertainty in the velocity readings followed by the uncertainties in the depth readings, the calibration and systemic errors and uncertainties in the width measurements. Increasing the number of stations gives a better representation of river cross-section and velocity profile. The most important source of error for the salt dilution method was improper salt mixing. The second most important source of error was the uncertainty associated to the calibration correction factor. Hysteresis was not considered a source of uncertainty, but the extrapolation of a rating curve beyond a range of low flow discharge measurements resulted in an underestimation of discharge at higher stages. Lineage a242acd4-e3c7-46e0-8f43-f428fb824018 1347af6c-aedf-4ec6-bd37-ed508df6c40a

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Licence: Creative Commons Attribution 4.0
Limitations: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

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Dates

Metadata Reference Date(s) March 29, 2022 (Publication)
March 29, 2022 (Revision)
Dataset Reference Date(s) September 30, 2013 (Creation)
December 10, 2017 (Publication)
Frequency of Update As Needed

Citation

Dataset extent

Map data © OpenStreetMap contributors

Additional Info

Field Value
Ocean Variables Other
Scope Dataset
Status On Going
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Point of Contact
Point of Contact 1
Name
Hakai Geospatial Technology Team
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Custodian
  • Point of Contact
Point of Contact 2
Name
Matthew Henderson
Affiliation
Hakai Institute
Role
  • Custodian
  • Point of Contact
Responsible Party
Responsible Party 1
Name
Maartje C. Korver
Affiliation
Hakai Institute
Email
maartje.korver@hakai.org
Role
  • Author
  • Owner
Responsible Party 2
Name
H. J. van Meerveld
Role
Author
Responsible Party 3
Name
William C. Floyd
Role
Author
Responsible Party 4
Name
M. J. Waterloo
Role
Author
Responsible Party 5
Name
Matthew Henderson
Affiliation
Hakai Institute
Role
Publisher
Distributor
Distributor 1
Name
Maartje C. Korver
Affiliation
Hakai Institute
Email
maartje.korver@hakai.org
Role
Distributor
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North Bounding Latitude 51.71110094
South Bounding Latitude 51.62592806
East Bounding Longitude -127.94402727
West Bounding Longitude -128.11706194
Temporal Extent
Begin
2013-09-30
End
2015-02-28
Vertical Extent
Min
0.0
Max
0.0
Default Locale English
Citation identifier
Code
10.21966/1.715699