Evaluation of evaporation-pan networks

David A. Chin, Sifang Zhao

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

A methodology to assess the relative merits of using evaporation-pan networks and semiempirical functions to estimate reference-crop evapotranspiration (ET) is presented. Estimation-error variance is proposed as a basis for comparison. In the case of pan networks, ordinary kriging and universal kriging are viable options for determining estimation-error variance. In the case of semiempirical ET functions, a formulation is developed that expresses the estimation-error variance in terms of the uncertainties in extrapolating meteorological data from measurement locations. The proposed methodology is demonstrated within a 44,000 km2 area of southern Florida. The results show that universal kriging is the preferred method for estimating reference-crop ET from pan measurements, and the Penman-Monteith method is the preferred estimation method from meteorological data. The pan-based universal kriging approach yields a lower estimation-error variance than the Penman-Monteith function, indicating that pan-based estimates of reference-crop evapotranspiration are preferable to semiempirical evapotranspiration functions in south Florida.

Original languageEnglish (US)
Pages (from-to)338-346
Number of pages9
JournalJournal of Irrigation and Drainage Engineering
Volume121
Issue number5
DOIs
StatePublished - Sep 1995

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Water Science and Technology
  • Agricultural and Biological Sciences (miscellaneous)

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