Persistent Link:
http://hdl.handle.net/10150/191699
Title:
Error analysis of evapotranspiration measurements
Author:
Hartman, Robert Kent.
Issue Date:
1980
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Model, site, sampling and instrumentation requirements for the Bowen ratio energy budget method were evaluated to provide guidelines for proper application. An error analysis procedure was developed to evaluate system performance and identify potential areas of improvement. The procedures were applied to two sets of field data to identify the measurement errors. Bowen ratio energy budget measurements were made over an extensive stand of mesquite (Prosopis pubescens) in the San Pedro River valley near Mammoth, Arizona in May, 1978 and over a kochea (Kochea scoparia) pasture adjacent to the Pecos River near Roswell, New Mexico in July, 1979. Mean daily evapotranspiration over the mesquite stand was about 5 mm. The error analysis indicated mean half-hour 95 percent confidence intervals for latent and sensible energy of 0.48 ± 0.09 and 0.21 ± 0.09 cal/cm²/min respectively, with a majority of the error originating in the Bowen ratio measurement. Diode circuitry and calibration procedures were improved for the July 1979 study. The mean daily evapotranspiration over the kochea pasture was about 3 mm. The 95 percent confidence intervals on the mean half-hour estimates of latent and sensible energy were 0.27 ± 0.01 and 0.23 ± 0.01 cal/cm²/min respectively. The increased measurement precision was attributed to the improvements made in the system.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Evapotranspiration -- Measurement.; Phreatophytes.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Renewable Natural Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Gay, Lloyd W.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleError analysis of evapotranspiration measurementsen_US
dc.creatorHartman, Robert Kent.en_US
dc.contributor.authorHartman, Robert Kent.en_US
dc.date.issued1980en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractModel, site, sampling and instrumentation requirements for the Bowen ratio energy budget method were evaluated to provide guidelines for proper application. An error analysis procedure was developed to evaluate system performance and identify potential areas of improvement. The procedures were applied to two sets of field data to identify the measurement errors. Bowen ratio energy budget measurements were made over an extensive stand of mesquite (Prosopis pubescens) in the San Pedro River valley near Mammoth, Arizona in May, 1978 and over a kochea (Kochea scoparia) pasture adjacent to the Pecos River near Roswell, New Mexico in July, 1979. Mean daily evapotranspiration over the mesquite stand was about 5 mm. The error analysis indicated mean half-hour 95 percent confidence intervals for latent and sensible energy of 0.48 ± 0.09 and 0.21 ± 0.09 cal/cm²/min respectively, with a majority of the error originating in the Bowen ratio measurement. Diode circuitry and calibration procedures were improved for the July 1979 study. The mean daily evapotranspiration over the kochea pasture was about 3 mm. The 95 percent confidence intervals on the mean half-hour estimates of latent and sensible energy were 0.27 ± 0.01 and 0.23 ± 0.01 cal/cm²/min respectively. The increased measurement precision was attributed to the improvements made in the system.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshEvapotranspiration -- Measurement.en_US
dc.subject.lcshPhreatophytes.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairGay, Lloyd W.en_US
dc.contributor.committeememberFogel, Martin M.en_US
dc.contributor.committeememberHekman, Jr., Louis H.en_US
dc.identifier.oclc212888184en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.