Titre :
|
Hydrology models DRAINMOD and SWIM applied to large soil lysimeters with artificial drainage
|
Auteurs :
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G. Barkle ;
T. Brown ;
D. Painter ;
AL Et
|
Type de document :
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article/chapitre/communication
|
Année de publication :
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1998
|
Format :
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p. 783-797
|
Langues:
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= Anglais
|
Catégories :
|
EAUX SOUTERRAINES EAU DANS LE SOL
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Mots-clés:
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LYSIMETRIE
;
MODELE DE SIMULATION
;
HUMIDITE DU SOL
;
PROFIL HYDRIQUE
;
SURFACE PHREATIQUE
;
DRAINAGE SOUTERRAIN
|
Résumé :
|
Two hydrological models, which used different methods to determine the soil water distribution in a soil profile, were evaluated against 4 years of data from large soil lysimeters. SWIM determines soil water distribution from a finite difference implementation of the Richards' equation. DRAINMOD uses a soil-specific relationship between the air volume in a profile and the watertable height to locate the depth to the saturated zone. An 'equilibrium' relationship between soil water tension and depth is then assumed to distribute the soil water in the unsaturated zone. Predicted values and measured values for drainage and watertable heights were compared for 3 drainage treatments. The drainage in the lysimeters was achieved by installing an outlet tube on the slowly permeable layer at 0.75 m from the soil surface. The conventional drainage treatment allowed gravity drainage to occur directly from this drainage outlet tube. The other 2 drainage treatments employed controlled drainage, where a step (or weir) is installed in the outlet tube. No drainage can occur from the lysimeters until the water table within the lysimeters reaches the step height. Two different step heights provided 2 controlled drainage treatments.
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Source :
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Australian Journal of Soil Research, vol.36
|