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Title: Nocturnal river water temperatures: spatial and temporal variations
Authors: Wilby, Robert L.
Johnson, Matthew F.
Toone, Julia
Keywords: Water temperature
Logistic regression
Hysteresis curve
Thermal wave
Riparian shade
River management
Issue Date: 2014
Publisher: © Elsevier B.V.
Citation: WILBY, R.L., JOHNSON, M.F. and TOONE, J.A., 2014. Nocturnal river water temperatures: spatial and temporal variations. Science of the Total Environment, 482-483, pp. 157 - 173.
Abstract: Nocturnal water temperature (Tw) affects the behaviour of aquatic biota and metabolism of whole rivers. However, night-time water temperature (nTw) is poorly understood because spot samples are typically taken during daylight hours, or Tw series are aggregated in ways that mask sub-daily properties. This paper examines 15-minute measurements of Tw and air temperature (Ta) collected at 36 sites in the Rivers Dove and Manifold, English Peak District. Data were stratified by day and night then analysed using hysteresis, auto-correlation and logistic regression techniques. Daily hysteresis loops show lagged responses between nTw and previous daylight air temperatures (dTa), plus the influence of groundwater and discharge variations. Logistic regression models were modified using a seasonal factor and explained between 80 and 94% of the variance in daily maximum nTw; minimum nTw were predicted with less skill, particularly for headwater sites in summer. Downstream variations in model parameters also reflect the influence of groundwater and/or riparian shade, and prevailing weather conditions. A case is presented where an intense summer storm resulted in the propagation of a thermal wave that produced maximum Tw at some sites during hours of darkness. Hence, our findings show that Tw management by riparian shade has to be seen in a catchment wide context, with anticipated benefits normalised for weather variability, extreme rainfall events, local influence of groundwater, and channel structures.
Description: NOTICE: this is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of the Total Environment, vol 482-483, June 2014, DOI: 10.1016/j.scitotenv.2014.02.123
Version: Accepted for publication
DOI: 10.1016/j.scitotenv.2014.02.123
URI: https://dspace.lboro.ac.uk/2134/16258
Publisher Link: http://dx.doi.org/10.1016/j.scitotenv.2014.02.123
ISSN: 0048-9697
Appears in Collections:Published Articles (Geography and Environment)

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