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Wilby et al 2014 SOTE - Nocturnal river water temperatures.pdf (2.49 MB)

Nocturnal river water temperatures: spatial and temporal variations

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journal contribution
posted on 2014-11-18, 14:46 authored by Robert WilbyRobert Wilby, Matthew F. Johnson, Julia Toone
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.

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

SCIENCE OF THE TOTAL ENVIRONMENT

Volume

482

Pages

157 - 173 (17)

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.

Publisher

© Elsevier B.V.

Version

  • AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

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

ISSN

0048-9697

Language

  • en

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