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Wind speed interpolation for evapotranspiration assessment in complex topography area

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Abstract

Wind speed and direction are fundamental data for many application fields, such as power generation and hydrological modelling. Wind measurements are usually few and sparse; hence, spatial interpolation of wind data is required. However, in mountainous areas with complex orography, accurate interpolation of wind data should consider topographic effects. Due to computational constraints, fully physically based methods that solve thermodynamic and mass conservation equations in three dimensions cannot be applied for long-time simulations or very large areas, while fast empirical methods seem more suitable. The aim of this work is to compare fast empirical methods to interpolate wind speed against a physically based full atmospheric model in order to assess the impact of the introduced approximation in estimating the wind field and the potential evapotranspiration. Comparison is carried out over the area of the upper Po River basin, a predominantly alpine region located in northern Italy. Results show that empirical topographic correction can increase accuracy of interpolated wind speed in areas with complex topography, but it requires about 50% more computational time than simpler empirical methods that do not consider topography.

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Acknowledgements

We thank Prof. Glen E. Liston for kindly providing the original Fortran code of the MicroMet model from which the program used in this analysis was derived.

Funding

This research was funded by Italian Ministry of University and Research within the project “Reconciling precipitation with runoff: the role of understated measurement biases in the modelling of hydrological processes” (http://www.precipitation-biases.it/).

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Correspondence to Alessandro Ceppi.

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Ravazzani, G., Ceppi, A. & Davolio, S. Wind speed interpolation for evapotranspiration assessment in complex topography area. Bull. of Atmos. Sci.& Technol. 1, 13–22 (2020). https://doi.org/10.1007/s42865-019-00001-5

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  • DOI: https://doi.org/10.1007/s42865-019-00001-5

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