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Implementation of a root water extraction module in CATHY: Comparison of four empirical root-density distribution models.

Muma, Mushombe; Gumière, Silvio José; Rousseau, Alain N.; Scudeler, Carlotta; Paniconi, Claudio (2013). Implementation of a root water extraction module in CATHY: Comparison of four empirical root-density distribution models. Procedia Environmental Sciences , vol. 19 . p. 57-66. DOI: 10.1016/j.proenv.2013.06.007.

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Résumé

A root water-extraction module was incorporated into CATHY, a coupled surface-subsurface flow, physically-based, distributed hydrological model, to account for transpiration of annual crops. Four empirical vertical root-density distribution models were used to evaluate the effect of plant transpiration on tile-drain flow and edge-of-field flow. Model 1 uses a uniform distribution for the entire root zone; Model 2, a nonlinear root density distribution function; and Models 3 and 4, two configurations of exponential root water uptake distribution. When comparing simulation results with and without a root water extraction module, we observed that Model 1 produces reasonable reductions in tile-drain and edge-of-field flows. Further analysis indicates that edge-of-field flow is more affected by the root water extraction module than tile-drain flow. Therefore, as the unsaturated zone increases, edge-of-field flow decreases more than tile-drain flow.

Type de document:
Mots-clés libres: CATHY; plant transpiration; root density distribution models; unsaturated zone
Centre: Centre Eau Terre Environnement
Date de dépôt: 06 déc. 2016 21:31
Dernière modification: 29 juin 2017 15:32
URI: http://espace.inrs.ca/id/eprint/3478

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