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| Titre : |
Evaporation from a pine forest - using the aerodynamic method and bowen ratio method.
|
| Auteur(s) : |
R. Vogt, Auteur (et co-auteur)
L. Jaeger, Auteur (et co-auteur) |
| Type de document : | Tiré à part |
| Sujets : | Allemagne ; Pinus sylvestris ; Évaporation ; Forêt ; Méthode ; Relation plante eau |
| Résumé : |
We found a clear dependence of the zero plane displacement, d, and the roughness length, z0, on wind speed; d decreased with increasing wind speed and z0 increased with wind speed. Evaporation was 736 mm using the aerodynamic method; with the water balance we obtained a value of 826 mm during the monitoring period. The latter value is probably 5-10% too high because of a possible loss through percolation. The aerodynamic method is very sensitive to the value of d. A 10% difference in d leads to a corresponding difference in the evaporation estimate. Additional calculations to compare the results with the Haude formula and the Priestley-Taylor equation confirmed that they should be applied only for «potential evapotranspiration» estimates. The water balance calculated by means of the p[...] We found a clear dependence of the zero plane displacement, d, and the roughness length, z0, on wind speed; d decreased with increasing wind speed and z0 increased with wind speed. Evaporation was 736 mm using the aerodynamic method; with the water balance we obtained a value of 826 mm during the monitoring period. The latter value is probably 5-10% too high because of a possible loss through percolation. The aerodynamic method is very sensitive to the value of d. A 10% difference in d leads to a corresponding difference in the evaporation estimate. Additional calculations to compare the results with the Haude formula and the Priestley-Taylor equation confirmed that they should be applied only for «potential evapotranspiration» estimates. The water balance calculated by means of the profile method is suitable for examinations of empirical evapotranspiration formulae. |
| Editeur(s) : | Elsevier |
| Date de publication : | 1990 |
| Format : | pp. 39-54 / graph., tabl., réf. |
| Note(s) : |
Extrait de Agricultural and Forest Meteorology - Vol.50 - n°1-2 |
| Langue(s) : | Anglais |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=146870 |
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