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Evolution of the Spherical Cavity Radius Generated Around a Subsurface Drip Emitter : Volume 7, Issue 2 (18/03/2010)

By Gil, M.

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Book Id: WPLBN0004005441
Format Type: PDF Article :
File Size: Pages 24
Reproduction Date: 2015

Title: Evolution of the Spherical Cavity Radius Generated Around a Subsurface Drip Emitter : Volume 7, Issue 2 (18/03/2010)  
Author: Gil, M.
Volume: Vol. 7, Issue 2
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Sánchez, R., Rodríguez-Sinobas, L., Gil, M., & Juana, L. (2010). Evolution of the Spherical Cavity Radius Generated Around a Subsurface Drip Emitter : Volume 7, Issue 2 (18/03/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Irrigation Hydraulics Research Group, Technical University of Madrid, E.T.S.I. Agrónomos, Ciudad Universitaria s/n, 28040 Madrid, Spain. The emitter discharge in subsurface drip irrigation can be affected by soil properties. A positive pressure develops at the emitter outlet where a spherical cavity is assumed to form. In steady-state conditions, the pressure in the soil relates to soil hydraulic properties, the emitter discharge, and the cavity radius. This pressure in the soil is very sensitive to the cavity radius. In this paper, the development of the cavity around the emitter outlet was measured for various emitter discharges in laboratory tests carried out in containers with uniform loamy soils. A trend between soil pressure and emitter discharge was established that illustrates the performance of buried emitters in the field. Its application to the prediction of water distribution in subsurface drip irrigation units and its effect on the estimation of irrigation performance is also shown.

Summary
Evolution of the spherical cavity radius generated around a subsurface drip emitter

Excerpt
Ben-gal, A., Lazorovitch, N., and Shani, U.: Subsurface drip irrigation in gravel filled cavities, Vadose Zone J., 3, 1407–1413, 2004.; Day, P. R.: Particle fractionation and particle-size analysis, in: Methods of soil analysis. Part I: Agronomy, edited by: Black, C. A., 9, 545–567, 1965.; Gardner, W. R.: Some steady state solutions of unsaturated moisture flow equations with application to evaporation from a water table, Soil Sci., 85, 228–232,1958.; Gil, M., Rodríguez-Sinobas, L., Sánchez, R., Juana, L., and Losada, A.: Efecto del suelo en el caudal del gotero en riego subsuperficial. Determinación de caudales máximos, XXV Congreso Nacional de Riegos, Pamplona (España), 2007.; Gil, M., Rodríguez-Sinobas, L., Juana, L., Sánchez, R., and Losada, A.: Emitter discharge variability of subsurface drip irrigation in uniform soils. Effect on water application uniformity, Irrig. Sci., 26, 451–458, 2008.; Karmeli, D. and Keller, J.: Trickle irrigation design, Rain Bird Sprinkler Manufact. Corp. Glendora, CA, 1975.; Lazarovitch, N., Simunek, J., and Shani, U.: System dependent boundary conditions for water flow from a subsurface source, Soil Sci. Soc. Am. J., 69, 46–50, 2005.; Lazarovitch, N., Shani, U., Thompson, T. L., and Warrick, A. W.: Soil hydraulic properties affecting discharge uniformity of gravity-fed subsurface drip irrigation, J. Irrig. Drain Eng., 132, 531–536, 2006.; Patel, N. and Rajput, T. B. S.: Dynamics and modeling of soil water under subsurface drip irrigated onion, Agric. Water Manage., 95(12), 1335–1349, 2008.; Philip, J. R.: What happens near a quasi-linear point source?, Water Resour. Res., 28, 47–52, 1992.; Rodriguez-Sinobas L., Gil, M., Sánchez, R., and Juana, L.: Water distribution in subsurface drip irrigation Systems. I: Simulation, J. Irrig. Drain Eng., 135(6), 721–728, 2009a.; Rodriguez-Sinobas, L., Gil, M., Sánchez, R., and Juana, L.: Water distribution in subsurface drip irrigation Systems. II: Field evaluation, J. Irrig. Drain Eng., 135(6), 729–738, 2009b.; Shani, U. and Or, D.: In situ method for estimating subsurface unsaturated hydraulic conductivity, Water Resour. Res., 21, 1863–1870, 1995.; Shani, U., Xue, S., Gordin-Katz, R., and Warrick, A. W.: Soil-limiting from Subsurface Emitters. I: Pressure Measurements, J. Irrig. Drain Eng., 122, 291–295, 1996.; Van Genuchten, M. Th.: A closed-form equation for predicting the hydraulic conductivity of unsaturated soils, Soil Sci. Soc. Am. J., 44, 892–898, 1980.; Warrick, A. W. and Shani, U.: Soil-limiting flow from subsurface emitters. II: Effect on uniformity, J. Irrig. Drain. Eng., 122, 296–300, 1996.

 

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