- Title
- Representation of plot‐scale soil heterogeneity in dual‐domain effective flow and transport models with mass exchange
- Creator
- Filipović, Vilim; Coquet, Yves; Gerke, Horst
- Date
- 2019
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/190130
- Identifier
- vital:17559
- Identifier
-
https://doi.org/10.2136/vzj2018.09.0174
- Identifier
- ISSN:1539-1663
- Abstract
- Core Ideas The heterogeneity of soil hydraulic properties can be described with effective parameters. Increasing model complexity can be used to represent plot‐scale soil heterogeneity. One‐dimensional dual‐domain flow models are used to reproduce 2D preferential transport. Local subscale variability effects are included as mass transfer in an effective model. Agricultural soils are characterized by a structure that is strongly dependent on farming practices like tillage and trafficking. These practices can create compacted zones in the soil, thus initiating preferential flow. Two‐ or three‐dimensional models can be used to account for the spatial variability of the soil hydraulic and transport properties. Since it is challenging to obtain such data, it is logical to find simpler approaches. Our objective was to design a one‐dimensional (1D) modeling approach that effectively accounts for plot‐scale soil structure variability. A 1D dual‐permeability model was tested in which compacted soil was represented by a matrix domain and uncompacted soil by a fracture domain and eventually by assuming an additional immobile water region (MIM) in the fracture domain representing compacted clods embedded within the uncompacted soil. Models (1D) were compared with two‐dimensional single‐porosity (2D_SP) modeling results for water flow and Br− transport based on a previously performed field tracer experiment. Results indicated good agreement between 1D dual‐domain approaches (1D_DPERM and 1D_DPERM_MIM) and the 2D_SP representative model simulation results with high model efficiency and with respect to the field observations. This implied that a 1D vertical model description was sufficient to represent plot‐scale variability if smaller scale soil structure heterogeneities could be accounted for as effective parameters in dual‐domain models. Variation in the mass transfer term had a large effect on the vertical Br− profile distribution. The parameters describing the sizes and shapes of the domains were most relevant for estimating mass transfer between soil structural features in heterogeneous agricultural fields. Still, the calibration of the upscaling approach of two‐domain interactions in larger scale models remains challenging.
- Publisher
- Madison: The Soil Science Society of America, Inc
- Relation
- Vadose zone journal Vol. 18, no. 1 (2019), p. 1-14
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- https://creativecommons.org/licenses/by-nc-nd/4.0/
- Rights
- Copyright authors
- Rights
- Open Access
- Subject
- Agricultural land; Agricultural practices; Agricultural sciences; Calibration; Compacted soils; Domains; Flow velocity; Heterogeneity; Hydraulic properties; Hydraulics; Life Sciences; Mass transfer; Model testing; Modelling; Parameters; Permeability; Porosity; Preferential flow; Properties; Scale models; Simulation; Soil; Soil compaction; Soil permeability; Soil porosity; Soil properties; Soil structure; Soil study; Soil testing; Spatial variations; Tillage; Tracers; Transport; Transport properties; Two dimensional models; Variability; Vertical distribution; Water flow; 3707 Hydrology; 4106 Soil sciences
- Full Text
- Reviewed
- Funder
- Project SLOPE_FLOW under Grant Contract 57217986) and PHC COGITO 2015/2017 bilateral research agreement (Contract 33049VJ/37472QB) between France and Croatia
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