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| Titel |
Evaporation characteristics of wetlands: experience from a wetgrassland and a reedbed using eddy correlation measurements |
| VerfasserIn |
M. C. Acreman, R. J. Harding, C. R. Lloyd, D. D. McNeil |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 7, no. 1 ; Nr. 7, no. 1, S.11-21 |
| Datensatznummer |
250004416
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| Publikation (Nr.) |
 copernicus.org/hess-7-11-2003.pdf |
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| Zusammenfassung |
| Measurements of evaporation were made from July to November 1999 using the
eddy correlation method on two wetland types – wet grassland and reedbeds – in south west
England. The evaporative water use of a reed bed exceeded that of the grassland wetland
by 15% (or 50 mm over the 5 months). The evaporation rates at both sites exceed of the
Penman Potential Evaporation estimates calculated for this area. The difference between
sites results from the higher roughness length of the reed bed and the lower effective
surface resistance of the reed/open water assemblage. At the grassland site, a significant
relationship between the surface resistance and water table level has been demonstrated.
The water table at this site is managed to maintain the plant diversity and allow some
agricultural access. This regime specifies a water table below the surface during the
summer period, which results in higher surface resistances and lower evaporation. The
results have important implications for local water resources management, especially where
wetlands are maintained by pumping from rivers or groundwater.
Keywords: wetlands, evaporation, eddy correlation, wet grassland, reedbed, vapour
pressure, water table level |
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