Adjusted Koeye River stage and temperature from 2013 to 2021

The Koeye River stream elevation gauge was first installed in September 2013. This original gauge was a Hobo U20 water level logger, and was installed upstream of the smolt-trap site on the lower Koeye River in a still built from perforated PVC pipe with a cement block as it’s base. This gauge operated more or less continuously until May 27, 2019, when the battery finally died. Throughout this 6-year period the original stream gauge in Koeye provided vital insights into the flow conditions encountered by juvenile and adult salmon in the Koeye River, and stream elevation data from the site were used as a covariate in a number of analyses, including relating adult sockeye survival and smolt capture probability during the spring smolt trapping season to river flow.

A second stream elevation gauge (also a Hobo U20) was installed by Hakai in late August of 2017. This gauge was installed using a much more robust and permanent anchoring and still system. This gauge continues to operate, providing ongoing monitoring of flow conditions in the lower Koeye River, however in order to use these data in existing analyses there was a need to calibrate the Hakai gauge with the original gauge dataset.

Analysis – To calibrate the two gauge datasets we used a generalized additive model (gam) written in the statistical program R. This model assumed that residual errors followed a gaussian distribution and related the original Koeye gauge values (response variable) to the new Hakai gauge values (predictor variable). Goodness of fit was evaluated visually using residual plots. We then extrapolated the estimated relationship between the two gauge datasets to generate predictions of the old gauge height for dates after May 27, 2019 using the predict() function in R.

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Licence: Creative Commons Attribution 4.0

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Metadata Reference Date(s) July 08, 2022 (Publication)
July 08, 2022 (Revision)
Dataset Reference Date(s) September 14, 2013 (Creation)
July 08, 2022 (Publication)
Frequency of Update As Needed

Responsible Party 1
Name
Will Atlas
Affiliation
Wild Salmon Centre
Email
watlas@wildsalmoncenter.org
Role
  • Author
  • Distributor
  • Owner
  • Point of Contact
  • Principal Investigator
Responsible Party 2
Name
Ian Giesbrecht
Affiliation
Hakai Institute
Email
ian.giesbrecht@hakai.org
Role
  • Author
  • Point of Contact
Responsible Party 3
Name
Emily Haughton
Affiliation
Hakai Institute
Email
emily.haughton@hakai.org
Role
Custodian

Field Value
Ocean Variables Other
Scope Dataset
Status Completed
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Spatial Extent { "coordinates": [ [ [ -127.9, 51.75 ], [ -127.7, 51.75 ], [ -127.7, 51.82 ], [ -127.9, 51.82 ], [ -127.9, 51.75 ] ] ], "type": "Polygon" }
North Bounding Latitude 51.82
South Bounding Latitude 51.75
East Bounding Longitude -127.7
West Bounding Longitude -127.9
Temporal Extent
Begin
2013-09-14
End
2021-10-19
Vertical Extent
Min
0.0
Max
0.0
Default Locale English
Citation identifier
Code
10.21966/eh5c-jh12