Emitter discharge variability of subsurface drip irrigation in uniform soils: effect on water-application uniformity

Gil Rodríguez, María and Rodríguez Sinobas, Leonor and Juana Sirgado, Luis and Sánchez Calvo, Raúl and Losada Villasante, Alberto (2008). Emitter discharge variability of subsurface drip irrigation in uniform soils: effect on water-application uniformity. "Irrigation Science", v. 26 (n. 6); pp. 451-458. ISSN 0342-7188. https://doi.org/10.1007/s00271-008-0116-1.

Description

Title: Emitter discharge variability of subsurface drip irrigation in uniform soils: effect on water-application uniformity
Author/s:
  • Gil Rodríguez, María
  • Rodríguez Sinobas, Leonor
  • Juana Sirgado, Luis
  • Sánchez Calvo, Raúl
  • Losada Villasante, Alberto
Item Type: Article
Título de Revista/Publicación: Irrigation Science
Date: September 2008
ISSN: 0342-7188
Volume: 26
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Emitter discharge of subsurface drip irrigation (SDI) decreases as a result of the overpressure in the soil water at the discharge orifice. In this paper, the variation in dripper discharge in SDI laterals is studied. First, the emitter coefficient of flow variation CVq was measured in laboratory experiments with drippers of 2 and 4 L/h that were laid both on the soil and beneath it. Additionally, the soil pressure coefficient of variation CVhs was measured in buried emitters. Then, the irrigation uniformity was simulated in SDI and surface irrigation laterals under the same operating conditions and uniform soils; sandy and loamy. CVq was similar for the compensating models of both the surface and subsurface emitters. However, CVq decreased for the 2-L/h non-compensating model in the loamy soil. This shows a possible self-regulation of non-compensating emitter discharge in SDI, due to the interaction between effects of emitter discharge and soil pressure. This resulted in the irrigation uniformity of SDI non-compensating emitters to be greater than surface drip irrigation. The uniformity with pressure-compensating emitters would be similar in both cases, provided the overpressures in SDI are less than or equal to the compensation range lower limit.

More information

Item ID: 2844
DC Identifier: http://oa.upm.es/2844/
OAI Identifier: oai:oa.upm.es:2844
DOI: 10.1007/s00271-008-0116-1
Official URL: http://www.springerlink.com/content/xj40l8827201/?p=30feadde62c843b0a01f4f6873c55f54&pi=10
Deposited by: Memoria Investigacion
Deposited on: 15 Apr 2010 09:40
Last Modified: 20 Apr 2016 12:29
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