HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (3) Citing Articles via Google Scholar Google Scholar Articles by Lazarovitch, N. Articles by Shani, U. Search for Related Content PubMed Articles by Lazarovitch, N. Articles by Shani, U. Agricola Articles by Lazarovitch, N. Articles by Shani, U. Related Collections Soil Physics Water Flow Models

Division S-1—Soil Physics

System-Dependent Boundary Condition for Water Flow from Subsurface Source

N. Lazarovitch^a, J. imnek^b and U. Shani^a,*

^a Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
^b Dep. of Environmental Sciences, University of California, Riverside, CA USA

^* Corresponding author (shuri{at}agri.huji.ac.il).

Infiltration rate of water from a subsurface cavity is affected by many factors, including the pressure in the cavity, its size and geometry, and the hydraulic properties of the surrounding soil. When a predetermined discharge of a subsurface source (e.g., a subsurface emitter) is larger than the soil infiltration capacity, the pressure head in the source outlet increases and becomes positive. The built up pressure may significantly reduce the source discharge rate. The main objective of this work was to develop a boundary condition that describes this process while considering the source characteristics, and to implement this boundary condition into the transient numerical model Hydrus-2D. This new, system-dependent boundary condition allows calculation of the source discharge while considering source properties, inlet pressure, and effects of the soil hydraulic properties. The updated numerical model was verified against existing analytical solutions for simplified steady-state conditions and validated against transient experimental data. Good agreement was found between transient cavity pressures measured in laboratory experiments and those calculated using the updated numerical model. The modified program allows using any analytical model that describes the soil hydraulic properties and source characteristics, simulating both short and long duration infiltration events, as well as considering various geometrical shapes of subsurface sources.

This article has been cited by other articles:

				J. Simunek, M. Th. van Genuchten, and M. Sejna Development and Applications of the HYDRUS and STANMOD Software Packages and Related Codes Vadose Zone J., May 27, 2008; 7(2): 587 - 600. [Abstract] [Full Text] [PDF]

				N. Lazarovitch, A. W. Warrick, A. Furman, and J. Simunek Subsurface Water Distribution from Drip Irrigation Described by Moment Analyses Vadose Zone J., January 24, 2007; 6(1): 116 - 123. [Abstract] [Full Text] [PDF]