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Error and uncertainty with the determination of the soil water retention function and saturated hydraulic conductivity for soil water modelling

Citation

Hardie, M and Lisson, S and Doyle, R and Cotching, W, Error and uncertainty with the determination of the soil water retention function and saturated hydraulic conductivity for soil water modelling, Proceedings of the 5th Joint Soil Science Australia and New Zealand Society of Soil Science Conference, 2-7 December 2012, Hobart, Tasmania, pp. 755-758. ISBN 978-0-646-59142-1 (2012) [Refereed Conference Paper]


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Copyright Statement

Copyright 2012 Australian Society of Soil Science Incorporated

Official URL: http://www.soilscience2012.com/

Abstract

Simulation of soil water movement in Richards’ equation based soil-water models requires knowledge of the soil water retention function and saturated hydraulic conductivity. Traditionally these parameters have been determined by desorption which is costly and time consuming. In this study we compared VGM parameter values determined by desorption with two rapid approaches, laboratory evaporative flux and inverse solution of in situ cumulative infiltration from tension infiltrometers. Methodology had a profound effect on all VGM parameters except n. Methodology influenced saturated hydraulic conductivity values which varied by up to four orders of magnitude. Both rapid assessment procedures were improved by knowledge of the residual water content èr or moisture content at -1500 kPa. In water repellent or vertic soils differences in VGM values resulted in a lack of confidence in all procedures.

Item Details

Item Type:Refereed Conference Paper
Keywords:HYDRUS, disk permeameter, soil water retention function, soil-water model, inverse solution
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Soil Physics
Objective Division:Environment
Objective Group:Soils
Objective Field:Soils not elsewhere classified
Author:Hardie, M (Mr Marcus Hardie)
Author:Lisson, S (Dr Shaun Lisson)
Author:Doyle, R (Dr Richard Doyle)
Author:Cotching, W (Dr Bill Cotching)
ID Code:77871
Year Published:2012
Deposited By:Agricultural Science
Deposited On:2012-06-02
Last Modified:2014-08-19
Downloads:1 View Download Statistics

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