Modelling trickle irrigation: Comparison of analytical and numerical models for estimation of wetting front position with time

F.J. Cook, P. Fitch, P.J. Thorburn, P.B. Charlesworth, Keith Bristow

Research output: Book chapter/Published conference paperConference paperpeer-review

Abstract

Irrigation practices that are profligate in their use of water have come under closer scrutinyby water managers and the public. Trickle irrigation has the propensity to increase water use efficiencybut only if the system is designed to meet the soil and plant conditions. Recently we have provided asoftware tool, WetUp, to calculate the wetting patterns from trickle irrigation emitters. WetUp uses ananalytical solution to calculate the wetted perimeter for both buried and surface emitters. Thisanalytical solution has a number of assumptions, one of which is that the hydraulic conductivity (k) atthe wetting front is a specific value. Here we compare the wetting patterns calculated with a 2-dimensional numerical model, HYDRUS2D, for solving the flow into typical soils with the analyticalsolution. The results show that the wetting patterns are similar. Difficulties were experienced withgetting stable solutions with HYDRUS2D for soils with low hydraulic conductivities.
Original languageEnglish
Title of host publicationIntegrative Modelling of Biophysical, Social and Economic Systems for Resource Management Solutions
EditorsD.A. Post
Place of PublicationAustralia
PublisherModelling and Simulation Society of Australia and New Zealand
Pages212-217
Number of pages6
ISBN (Electronic)174052098X
Publication statusPublished - 2003
EventMODSIM 2003 International Congress on Modelling and Simulation. - Townsville, Queensland, Australia
Duration: 14 Jul 200317 Jul 2003

Conference

ConferenceMODSIM 2003 International Congress on Modelling and Simulation.
CountryAustralia
Period14/07/0317/07/03

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