Abstract
The potential impacts of floods are of significant concern to our modern society raising the need to identify and quantify all the uncertainties that can impact their simulations. Climate simulations at finer spatial resolutions are expected to bring more confidence in these hydrological simulations. However, the impact of the increasing spatial resolutions of climate simulations on floods simulations has to be evaluated. To address this issue, this paper assesses the sensitivity of summer–fall flood simulations to the Canadian Regional Climate Model (CRCM) grid resolution. Three climate simulations issued from the fifth version of the CRCM (CRCM5) driven by the ERA-Interim reanalysis at 0.44°, 0.22° and 0.11° resolutions are analysed at a daily time step for the 1981–2010 period. Raw CRCM5 precipitation and temperature outputs are used as inputs in the simple lumped conceptual hydrological model MOHYSE to simulate streamflows over 50 Quebec (Canada) basins. Summer–fall flooding is analysed by estimating four flood indicators: the 2-year, 5-year, 10-year and 20-year return periods from the CRCM5-driven streamflows. The results show systematic impacts of spatial resolution on CRCM5 outputs and seasonal flood simulations. Floods simulated with coarser climate datasets present smaller peak discharges than those simulated with the finer climate outputs. Smaller catchments show larger sensitivity to spatial resolution as more detail can be obtained from the finer grids. Overall, this work contributes to understanding the sensitivity of streamflow modelling to the climate model’s resolution, highlighting yet another uncertainty source to consider in hydrological climate change impact studies.
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Acknowledgements
The author would like to thank the Ouranos Consortium on Regional Climatology and Adaptation for the CRCM5 simulations provided, as well as the Consejo Nacional de Ciencia y Tecnología (CONACYT) and the Ministère de l’Économie, de la Science et de l’Innovation for partial funding of this project.
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Castaneda-Gonzalez, M., Poulin, A., Romero-Lopez, R. et al. Sensitivity of seasonal flood simulations to regional climate model spatial resolution. Clim Dyn 53, 4337–4354 (2019). https://doi.org/10.1007/s00382-019-04789-y
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DOI: https://doi.org/10.1007/s00382-019-04789-y