Comparison of riparian evapotranspiration estimates based on a water balance approach and sap flow measurements

R. D. Mac Nish, C. L. Unkrich, Evelyn Smythe, D. C. Goodrich, Thomas Maddock

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Estimates of evapotranspiration (ET) from riparian vegetation along a 122m reach of the San Pedro River using both a water balance approach and by scaling up sap flow measurements are compared. A sensitivity analysis was performed on the components of the water balance to assess the effects of measurement errors on estimates of ET using this method. It was concluded that by reducing the error in three key components to less than 5%, riparian ET could be estimated to an accuracy of 20-25% using the water balance method. The analysis also indicated that random measurement errors up to 10% in the water balance measurements would explain the difference between the water balance and sap flow ET estimates. Demonstrating agreement given reasonable error bounds provides confidence in the accuracy of both methods. (C) 2000 Elsevier Science B.V.

Original languageEnglish (US)
Pages (from-to)271-279
Number of pages9
JournalAgricultural and Forest Meteorology
Volume105
Issue number1-3
DOIs
StatePublished - Nov 20 2000

Keywords

  • Evapotranspiration
  • Groundwater
  • Riparian
  • San Pedro River
  • Sap flow
  • Water balance

ASJC Scopus subject areas

  • Forestry
  • Global and Planetary Change
  • Agronomy and Crop Science
  • Atmospheric Science

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