Analysis of furrow irrigation uniformity as affected by furrow spacing.

Persistent Link:
http://hdl.handle.net/10150/185190
Title:
Analysis of furrow irrigation uniformity as affected by furrow spacing.
Author:
Silva, Euzebio Medrado da.
Issue Date:
1990
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:
This research examines the effects of furrow spacing on irrigation uniformity and efficiency. Laboratory and field experiments were conducted to obtain information on soil physical characteristics, furrow infiltration and water advance data in order to validate the theoretical results. A furrow infiltration model based on Richards' equation and a finite element technique is developed and used to predict infiltrated depths in the transverse and longitudinal directions relative to the furrow centerline and furrow inlet, respectively. The model predicted measured furrow infiltration in the field from the third irrigation but failed to do so for the first and second irrigations. Simulations of furrow irrigation in a hypothetical soil with various furrow spacings showed that cumulative infiltration is not affected by furrow spacing until the lateral wetting front reaches the imaginary vertical boundary located midway between two furrows. An analysis of uniformity and efficiency from predicted water distribution profiles from field irrigated furrows are conclusive in that the use of longitudinal water distribution profile alone is not enough to assess the performance of furrow irrigation. The transverse distribution of infiltrated depths which is a function of furrow spacing must be included in the analysis.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Engineering.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Agriculture and Biosystems; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Hart, W.E.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleAnalysis of furrow irrigation uniformity as affected by furrow spacing.en_US
dc.creatorSilva, Euzebio Medrado da.en_US
dc.contributor.authorSilva, Euzebio Medrado da.en_US
dc.date.issued1990en_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.abstractThis research examines the effects of furrow spacing on irrigation uniformity and efficiency. Laboratory and field experiments were conducted to obtain information on soil physical characteristics, furrow infiltration and water advance data in order to validate the theoretical results. A furrow infiltration model based on Richards' equation and a finite element technique is developed and used to predict infiltrated depths in the transverse and longitudinal directions relative to the furrow centerline and furrow inlet, respectively. The model predicted measured furrow infiltration in the field from the third irrigation but failed to do so for the first and second irrigations. Simulations of furrow irrigation in a hypothetical soil with various furrow spacings showed that cumulative infiltration is not affected by furrow spacing until the lateral wetting front reaches the imaginary vertical boundary located midway between two furrows. An analysis of uniformity and efficiency from predicted water distribution profiles from field irrigated furrows are conclusive in that the use of longitudinal water distribution profile alone is not enough to assess the performance of furrow irrigation. The transverse distribution of infiltrated depths which is a function of furrow spacing must be included in the analysis.en_US
dc.description.notep. 290 missing from paper original and microfilm version.-
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectEngineering.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineAgriculture and Biosystemsen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHart, W.E.en_US
dc.contributor.committeememberSlack, D.C.en_US
dc.contributor.committeememberYitayew, Mulunehen_US
dc.contributor.committeememberWarrick, A.W.en_US
dc.identifier.proquest9103051en_US
dc.identifier.oclc709777807en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.