Estimating evapotranspiration for a temperate salt marsh, Newcastle, Australia

C. E. Hughes, J. D. Kalma, Philip John Binning, G. R. Willgoose, M. Vertzonis

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Evapotranspiration was studied at a salt marsh site in the Hunter River estuary, NSW, Australia, during 1996-8. Estimates of actual evapotranspiration if,) were obtained for three sites using the eddy correlation method. These values were compared with results obtained with the Penman anti Penman-Monteith equations, and with Fan evaporation. The Penman-Monteith method was found to be most reliable in estimating daily and hourly evapotranspiration. Surface resistance values averaging 12 s m(-1) were derived from the eddy correlation estimates. Recent tidal flooding and rainfall were found to decrease surface resistance and increase E,IE, ratios. Estimates of evapotranspiration obtained using the Penman-Monteith method were shown to be sensitive to changes in surface resistance, canopy height and the method used to estimate net radiation from incoming solar radiation. These results underline the importance of accurately estimating such parameters based on site-specific data rather than relying on empirical equations, which are derived primarily for crops and forests. Copyright (C) 2001 John Wiley & Sons, Ltd.
Keyword: surface resistance,Penman-Monteith,salt marsh,eddy correlation,evapotranspiration
Original languageEnglish
JournalHydrological Processes
Volume15
Issue number6
Pages (from-to)957-975
ISSN0885-6087
DOIs
Publication statusPublished - 2002
Externally publishedYes

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