Applying HYDRUS to flow in a Sodic clay soil with solution composition–dependent hydraulic conductivity

Reading, Lucy P., Baumgartl, Thomas, Bristow, Keith L. and Lockington, David A. (2012) Applying HYDRUS to flow in a Sodic clay soil with solution composition–dependent hydraulic conductivity. Vadose Zone Journal, 11 2: . doi:10.2136/vzj2011.0137


Author Reading, Lucy P.
Baumgartl, Thomas
Bristow, Keith L.
Lockington, David A.
Title Applying HYDRUS to flow in a Sodic clay soil with solution composition–dependent hydraulic conductivity
Journal name Vadose Zone Journal   Check publisher's open access policy
ISSN 1539-1663
Publication date 2012-05
Sub-type Article (original research)
DOI 10.2136/vzj2011.0137
Volume 11
Issue 2
Total pages 10
Place of publication Madison, WI United States
Publisher Soil Science Society of America
Collection year 2013
Language eng
Formatted abstract
Management of sodic soils under irrigation often requires application of chemical amelio-rants to improve permeability combined with leaching of excess salts. Modeling irrigation, soil treatments, and leaching in these sodic soils requires a model that can adequately represent the physical and chemical changes in the soil associated with the amelioration process. While there are a number of models that simulate reactive solute transport, UNSATCHEM and HYDRUS-1D are currently the only models that also include an ability to simulate the impacts of soil chemistry on hydraulic conductivity. Previous researchers have successfully applied these models to simulate amelioration experiments on a sodic loam soil. To further gauge their applicability, we extended the previous work by comparing HYDRUS simulations of sodic soil amelioration with the results from recently published laboratory experiments on a more reactive, repacked sodic clay soil. The general trends observed in the laboratory experiments were able to be simulated using HYDRUS. Differences between measured and simulated results were attributed to the limited flexibility of the function that represents chemistry-dependent hydraulic conductivity in HYDRUS. While improvements in the function could be made, the present work indicates that HYDRUS-UNSATCHEM captures the key changes in soil hydraulic properties that occur during sodic clay soil amelioration and thus extends the findings of previous researchers studying sodic loams.
Keyword Transport Model
Drip Irrigation
Cation Exchange
Salt Solutions
Porous media
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Created: Thu, 17 Jan 2013, 11:07:15 EST by Julie Hunter on behalf of School of Civil Engineering