Artificial pumping errors in the Kool-Parker scaling model of soil moisture hysteresis

Werner, A. D. and Lockington, D. A. (2006) Artificial pumping errors in the Kool-Parker scaling model of soil moisture hysteresis. Journal of Hydrology, 325 1-4: 118-133.


Author Werner, A. D.
Lockington, D. A.
Title Artificial pumping errors in the Kool-Parker scaling model of soil moisture hysteresis
Journal name Journal of Hydrology  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Publication date 2006
Sub-type Article
DOI 10.1016/j.jhydrol.2005.10.012
Volume number 325
Issue number 1-4
ISSN 0022-1694
Start page 118
End page 133
Total pages 16
Editor C Neal (Editor-in-Chief)
M Sophocleous (Editor-in-Chief)
R Krzysztofowicz (Editor-in-Chief)
Place of publication Amsterdam
Publisher Elsevier Science Bv
Collection year 2006
Language eng
Subject C1
290800 Civil Engineering
770400 Coastal and Estuarine Environment
Abstract Hysteresis models that eliminate the artificial pumping errors associated with the Kool-Parker (KP) soil moisture hysteresis model, such as the Parker-Lenhard (PL) method, can be computationally demanding in unsaturated transport models since they need to retain the wetting-drying history of the system. The pumping errors in these models need to be eliminated for correct simulation of cyclical systems (e.g. transport above a tidally forced watertable, infiltration and redistribution under periodic irrigation) if the soils exhibit significant hysteresis. A modification is made here to the PL method that allows it to be more readily applied to numerical models by eliminating the need to store a large number of soil moisture reversal points. The modified-PL method largely eliminates any artificial pumping error and so essentially retains the accuracy of the original PL approach. The modified-PL method is implemented in HYDRUS-1D (version 2.0), which is then used to simulate cyclic capillary fringe dynamics to show the influence of removing artificial pumping errors and to demonstrate the ease of implementation. Artificial pumping errors are shown to be significant for the soils and system characteristics used here in numerical experiments of transport above a fluctuating watertable. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Hysteresis
Water Retention Curve
Vadose Zone
Hydraulic Conductivity
Capillary Hysteresis
Porous-media
Flow
Dynamics
Engineering, Civil
Geosciences, Multidisciplinary
Water Resources
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 08:26:35 EST