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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hess-2016-230
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
23 May 2016
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Hydrology and Earth System Sciences (HESS).
Can riparian vegetation shade mitigate the expected rise in stream temperatures during heat waves in a pre-alpine river?
Heidelinde Trimmel1, Philipp Weihs1, David Leidinger1, Herbert Formayer1, and Gerda Kalny2 1Institute of Meteorology, University of Natural Resources and Life Science (BOKU), 1190, Vienna, Austria
2Institute of Soil Bioengineering and Landscape Construction (IBLB), University of Natural Resources and Life Science (BOKU), 1190, Vienna, Austria
Abstract. The influence of expected changes in heat wave intensity during the 21st century on the temperatures of an pre-alpine river are simulated and the mitigating effects of riparian vegetation shade on the radiant and turbulent energy fluxes analysed. Minor stream water temperature increases are modelled within the first half of the century, but a more significant increase is predicted for the period 2071–2100. The magnitude of maximum, mean and minimum stream temperature rises for a 20 year return period heat event was estimated to be in the region of 3 °C. Additional riparian vegetation is not able to fully mitigate the expected temperature rise caused by climate change, but can reduce maximum, mean and minimum stream temperatures by 1 to 2° C. Removal of existing vegetation amplifies stream temperature increases. Maximum stream temperatures could increase by more than 4 °C even in yearly heat events.

Citation: Trimmel, H., Weihs, P., Leidinger, D., Formayer, H., and Kalny, G.: Can riparian vegetation shade mitigate the expected rise in stream temperatures during heat waves in a pre-alpine river?, Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2016-230, in review, 2016.
Heidelinde Trimmel et al.
Heidelinde Trimmel et al.
Heidelinde Trimmel et al.

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Short summary
An increase in maximum stream temperatures is expected in eastern Austria, where air temperature rise is more than double recorded globally. Here stream temperatures of a pre-alpine river are simulated during heat wave episodes expected until the end of this century under riparian vegetation scenarios. An increase of up to 3 °C is predicted – thus exceeding thresholds of resident cold adapted species. Adding vegetation can reduce temperatures, but is not able to fully mitigate the expected rise.
An increase in maximum stream temperatures is expected in eastern Austria, where air temperature...
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