Lysimeter study of evapotranspiration of cattails and comparison of three estimation methods

A lysimeter was designed and installed in a cattail marsh as part of the Everglades Nutrient Removal project in South Florida (26 degrees 38' N, 80 degrees 25' W) to measure evapotranspiration (ET) of cattails (Typha domingensis). The fully automated lysimeter with a surface area of 9.8 m2...

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Bibliographic Details
Published inTransactions of the ASAE Vol. 38; no. 1
Main Authors Abtew, W. (South Florida Water Management District, West Palm Beach, FL.), Obeysekera, J
Format Journal Article
LanguageEnglish
Published 01.01.1995
Subjects
ENERGIA SOLAR
ENERGIE SOLAIRE
EVAPOTRANSPIRACION
EVAPOTRANSPIRATION
FLORIDA
FLORIDE
LISIMETROS
LYSIMETRE
MARISMA
MATEMATICAS
MATHEMATIQUE
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
PRAIRIE MARECAGEUSE
TYPHACEAE
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Summary:A lysimeter was designed and installed in a cattail marsh as part of the Everglades Nutrient Removal project in South Florida (26 degrees 38' N, 80 degrees 25' W) to measure evapotranspiration (ET) of cattails (Typha domingensis). The fully automated lysimeter with a surface area of 9.8 m2 was located inside the marsh to measure cattail ET in a marsh environment with sufficient fetch and minimum oasis effect on the lysimeter. The average measured ET rate was 3.9 mm per day for the period of 12 February to 19 December 1993. The Penman-Monteith equation was applied to estimate daily ET using physically based resistance parameter estimates and high resolution weather data. Also, average albedo (0.17) was computed for the vegetation for possible future computation of net radiation from solar radiation data. The Penman combination model was applied with new wind function coefficients developed for the study site and the Priestley-Taylor model was applied with an estimated average coefficient (a) value of 1.18. Seven-day mean of measured and estimated data were compared The Penman-Monteith method had the least error of estimation of 0.39 mm day-1 with an r2 value of 0.89 while the Penman combination equation had an error of estimation of 0.57 mm day-1 with r2 value of 0.86 and a least intercept of 0.03 mm. The Priestley-Taylor method with an a value of 1.18 had standard error of estimate 0.53 mm day-1 with an r2 value of 0.79. The Priestley-Taylor method has the potential to estimate ET in south Florida when climatic data is limited. More data is needed to evaluate each equation to estimate ET of wetland features in humid areas such as south Florida
Bibliography:M40
F60
U10
9561449
ISSN:0001-2351
2151-0059
DOI:10.13031/2013.27820