Quantification of surface energy fluxes from a small water body using scintillometry and eddy covariance

Ryan McGloin, Hamish McGowan, David McJannet, Freeman Cook, Andrey Sogachev, Stewart Burn

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Accurate quantification of evaporation from small water storages is essential for water management and planning, particularly in water-scarce regions. In order to ascertain suitable methods for direct measurement of evaporation from small water bodies, this study presents a comparison of eddy covariance and scintillometry measurements from a reservoir in southeast Queensland, Australia. The work presented expands on a short study presented by McJannet et al. (2011) to include comparisons of eddy covariance measurements and scintillometer-derived predictions of surface energy fluxes under a wide range of seasonal weather conditions. In this study, analysis was undertaken to ascertain whether important theoretical assumptions required for both techniques are valid in the complex environment of a small reservoir. Statistical comparison, energy balance closure, and the relationship between evaporation measurements and key environmental controls were used to compare the results of the two techniques. Reasonable agreement was shown between the sensible heat flux measurements from eddy covariance and scintillometry, while scintillometer-derived estimates of latent heat flux were approximately 21% greater than eddy covariance measurements. We suggest possible reasons for this difference and provide recommendations for further research for improving measurements of surface energy fluxes over small water bodies using eddy covariance and scintillometry. Key Points Source areas for Eddy covariance and scintillometry were on the water surface Reasonable agreement was shown between the sensible heat flux measurements Scintillometer estimates of latent heat flux were greater than eddy covariance
Original languageEnglish
JournalWater Resources Research
Volume50
Issue number1
Pages (from-to)494-513
ISSN0043-1397
DOIs
Publication statusPublished - 2014

Keywords

  • ENVIRONMENTAL
  • LIMNOLOGY
  • WATER
  • QUALITY ASSESSMENT
  • FOOTPRINT ESTIMATION
  • BALANCE CLOSURE
  • BOUNDARY-LAYER
  • LARGE-APERTURE
  • PART I
  • EVAPORATION
  • MODEL
  • LAKE
  • HEAT
  • Eddy covariance
  • scintillometry
  • footprint
  • complex terrain
  • sensible heat flux
  • latent heat flux
  • Evaporation
  • Heat flux
  • Interfacial energy
  • Latent heat
  • Reservoirs (water)
  • Surface waters
  • Water management
  • Complex terrains
  • Sensible heat flux
  • Scintillation
  • Complex terrain
  • Footprint
  • Latent heat flux
  • Scintillometry

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