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Resistances in
evaporation calculations


Victor M. Ponce
and
Jana Da Silva


14 August 2020

Abstract. This article reviews and explains the various resistance factors included in state-of-the-art evaporation/evapotranspiration calculations. Specifically, the external and internal resistances of the Penman-Montieth method and the five resistances contained in the Shuttleworth-Wallace method are described and clarified. Theoretical and empirical estimates for the calculation of the various resistances are presented.

1.  INTRODUCTION

The

2.  RESISTANCES IN THE PENMAN-MONTEITH METHOD

The

3.  RESISTANCES IN THE SHUTTLEWORTH-WALLACE METHOD

The

resistances

Fig. 1  Definition sketch of resistances in the Shuttleworth-Wallace method.

4.  SUMMARY

The

REFERENCES

Maidment, D. R. 1993. Handbook of Hydrology. McGraw-Hill.

Penman, H. L. 1948. "Natural Evaporation from Open Water, Bare Soil and Grass," Proceedings of the Royal Society, London, Vol. 193, pp. 120-145.

Ponce, V. M. 1989. Engineering Hydrology: Principles and Practices. Prentice Hall, Englewood Cliffs, New Jersey.

Ponce, V. M. 2014. Engineering Hydrology: Principles and Practices. Online text.

Shuttleworth, J. W. and J. S. Wallace, 1985. Evaporation of sparse crops-an energy combination theory. Quarterly Journal of the Royal Meteorological Society, Vol. III, pp. 839-885, January.

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