Model to increase the lateral line length of drip irrigation systems
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://elibrary.asabe.org/azdez.asp?JID=5&AID=41982&CID=dall2012&T=2 http://hdl.handle.net/11449/73936 |
Resumo: | Non-pressure compensating drip hose is widely used for irrigation of vegetables and orchards. One limitation is that the lateral line length must be short to maintain uniformity due to head loss and slope. Any procedure to increase the length is appropriate because it represents low initial cost of the irrigation system. The hypothesis of this research is that it is possible to increase the lateral line length combining two points: using a larger spacing between emitters at the beginning of the lateral line and a smaller one after a certain distance; and allowing a higher pressure variation along the lateral line under an acceptable value of distribution uniformity. To evaluate this hypothesis, a nonlinear programming model (NLP) was developed. The input data are: diameter, roughness coefficient, pressure variation, emitter operational pressure, relationship between emitter discharge and pressure. The output data are: line length, discharge and length of the each section with different spacing between drippers, total discharge in the lateral line, multiple outlet adjustment coefficient, head losses, localized head loss, pressure variation, number of emitters, spacing between emitters, discharge in each emitter, and discharge per linear meter. The mathematical model developed was compared with the lateral line length obtained with the algebraic solution generated by the Darcy-Weisbach equation. The NLP model showed the best results since it generated the greater gain in the lateral line length, maintaining the uniformity and the flow variation under acceptable standards. It had also the lower flow variation, so its adoption is feasible and recommended. |
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Model to increase the lateral line length of drip irrigation systemsEmission uniformityEmitters spacingOptimizationTrickle irrigationAdjustment coefficientAlgebraic solutionDarcy-Weisbach equationDistribution uniformityDrip irrigation systemsFlow variationsHead lossInitial costsInput datasIrrigation systemsLinear metersNon-pressure compensatingNonlinear programming modelOutput dataPressure variationsRoughness coefficientTwo-pointMathematical modelsIrrigationNon-pressure compensating drip hose is widely used for irrigation of vegetables and orchards. One limitation is that the lateral line length must be short to maintain uniformity due to head loss and slope. Any procedure to increase the length is appropriate because it represents low initial cost of the irrigation system. The hypothesis of this research is that it is possible to increase the lateral line length combining two points: using a larger spacing between emitters at the beginning of the lateral line and a smaller one after a certain distance; and allowing a higher pressure variation along the lateral line under an acceptable value of distribution uniformity. To evaluate this hypothesis, a nonlinear programming model (NLP) was developed. The input data are: diameter, roughness coefficient, pressure variation, emitter operational pressure, relationship between emitter discharge and pressure. The output data are: line length, discharge and length of the each section with different spacing between drippers, total discharge in the lateral line, multiple outlet adjustment coefficient, head losses, localized head loss, pressure variation, number of emitters, spacing between emitters, discharge in each emitter, and discharge per linear meter. The mathematical model developed was compared with the lateral line length obtained with the algebraic solution generated by the Darcy-Weisbach equation. The NLP model showed the best results since it generated the greater gain in the lateral line length, maintaining the uniformity and the flow variation under acceptable standards. It had also the lower flow variation, so its adoption is feasible and recommended.Faculdade de Ciências Agronômicas UNESP - Univ. Estadual Paulista, R. José Barbosa de Barros, 1780, 18607-037, Botucatu, SPFaculdade de Ciências Agronômicas UNESP - Univ. Estadual Paulista, R. José Barbosa de Barros, 1780, 18607-037, Botucatu, SPUniversidade Estadual Paulista (Unesp)Saad, João Carlos Cury [UNESP]Ludwig, Rafael [UNESP]2014-05-27T11:27:21Z2014-05-27T11:27:21Z2012-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject4628-4638application/pdfhttp://elibrary.asabe.org/azdez.asp?JID=5&AID=41982&CID=dall2012&T=2American Society of Agricultural and Biological Engineers Annual International Meeting 2012, v. 6, p. 4628-4638.http://hdl.handle.net/11449/739362-s2.0-848717791082-s2.0-84871779108.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012info:eu-repo/semantics/openAccess2024-04-30T14:03:00Zoai:repositorio.unesp.br:11449/73936Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-30T14:03Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Model to increase the lateral line length of drip irrigation systems |
title |
Model to increase the lateral line length of drip irrigation systems |
spellingShingle |
Model to increase the lateral line length of drip irrigation systems Saad, João Carlos Cury [UNESP] Emission uniformity Emitters spacing Optimization Trickle irrigation Adjustment coefficient Algebraic solution Darcy-Weisbach equation Distribution uniformity Drip irrigation systems Flow variations Head loss Initial costs Input datas Irrigation systems Linear meters Non-pressure compensating Nonlinear programming model Output data Pressure variations Roughness coefficient Two-point Mathematical models Irrigation |
title_short |
Model to increase the lateral line length of drip irrigation systems |
title_full |
Model to increase the lateral line length of drip irrigation systems |
title_fullStr |
Model to increase the lateral line length of drip irrigation systems |
title_full_unstemmed |
Model to increase the lateral line length of drip irrigation systems |
title_sort |
Model to increase the lateral line length of drip irrigation systems |
author |
Saad, João Carlos Cury [UNESP] |
author_facet |
Saad, João Carlos Cury [UNESP] Ludwig, Rafael [UNESP] |
author_role |
author |
author2 |
Ludwig, Rafael [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Saad, João Carlos Cury [UNESP] Ludwig, Rafael [UNESP] |
dc.subject.por.fl_str_mv |
Emission uniformity Emitters spacing Optimization Trickle irrigation Adjustment coefficient Algebraic solution Darcy-Weisbach equation Distribution uniformity Drip irrigation systems Flow variations Head loss Initial costs Input datas Irrigation systems Linear meters Non-pressure compensating Nonlinear programming model Output data Pressure variations Roughness coefficient Two-point Mathematical models Irrigation |
topic |
Emission uniformity Emitters spacing Optimization Trickle irrigation Adjustment coefficient Algebraic solution Darcy-Weisbach equation Distribution uniformity Drip irrigation systems Flow variations Head loss Initial costs Input datas Irrigation systems Linear meters Non-pressure compensating Nonlinear programming model Output data Pressure variations Roughness coefficient Two-point Mathematical models Irrigation |
description |
Non-pressure compensating drip hose is widely used for irrigation of vegetables and orchards. One limitation is that the lateral line length must be short to maintain uniformity due to head loss and slope. Any procedure to increase the length is appropriate because it represents low initial cost of the irrigation system. The hypothesis of this research is that it is possible to increase the lateral line length combining two points: using a larger spacing between emitters at the beginning of the lateral line and a smaller one after a certain distance; and allowing a higher pressure variation along the lateral line under an acceptable value of distribution uniformity. To evaluate this hypothesis, a nonlinear programming model (NLP) was developed. The input data are: diameter, roughness coefficient, pressure variation, emitter operational pressure, relationship between emitter discharge and pressure. The output data are: line length, discharge and length of the each section with different spacing between drippers, total discharge in the lateral line, multiple outlet adjustment coefficient, head losses, localized head loss, pressure variation, number of emitters, spacing between emitters, discharge in each emitter, and discharge per linear meter. The mathematical model developed was compared with the lateral line length obtained with the algebraic solution generated by the Darcy-Weisbach equation. The NLP model showed the best results since it generated the greater gain in the lateral line length, maintaining the uniformity and the flow variation under acceptable standards. It had also the lower flow variation, so its adoption is feasible and recommended. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-12-01 2014-05-27T11:27:21Z 2014-05-27T11:27:21Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://elibrary.asabe.org/azdez.asp?JID=5&AID=41982&CID=dall2012&T=2 American Society of Agricultural and Biological Engineers Annual International Meeting 2012, v. 6, p. 4628-4638. http://hdl.handle.net/11449/73936 2-s2.0-84871779108 2-s2.0-84871779108.pdf |
url |
http://elibrary.asabe.org/azdez.asp?JID=5&AID=41982&CID=dall2012&T=2 http://hdl.handle.net/11449/73936 |
identifier_str_mv |
American Society of Agricultural and Biological Engineers Annual International Meeting 2012, v. 6, p. 4628-4638. 2-s2.0-84871779108 2-s2.0-84871779108.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
American Society of Agricultural and Biological Engineers Annual International Meeting 2012 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
4628-4638 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965467860795392 |