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Error and uncertainty with the determination of the soil water retention function and saturated hydraulic conductivity for soil water modelling
conference contribution
posted on 2023-05-23, 06:46 authored by Marcus HardieMarcus Hardie, Lisson, S, Richard DoyleRichard Doyle, Cotching, WSimulation 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.
History
Publication title
Proceedings of the 5th Joint Soil Science Australia and New Zealand Society of Soil Science ConferenceEditors
LL Burkitt and LA SparrowPagination
755-758ISBN
978-0-646-59142-1Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Australian Society of Soil Science IncorporatedPlace of publication
Hobart, TasmaniaEvent title
5th Joint Soil Science Australia and New Zealand Society of Soil Science ConferenceEvent Venue
Hobart, TasmaniaDate of Event (Start Date)
2012-12-02Date of Event (End Date)
2012-12-07Rights statement
Copyright 2012 Australian Society of Soil Science IncorporatedRepository Status
- Restricted