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Hydrotheek

Record nummer 102127
Titel Model for unsaturated flow above a shallow water-table, applied to a regional sub-surface flow problem
toon extra info.
P.J.M. de Laat
Auteur(s) Laat, P.J.M. de
Uitgever Wageningen : Pudoc, Centre for Agricultural Publishing and Documentation
Jaar van uitgave 1980
Pagina's 126 p
Annotatie(s) Proefschrift Wageningen
Ook verschenen als handelsuitgave
ISBN 9022007251
Tutor(s) Molen, Prof. Dr. Ir. W.H. van der
Promotiedatum 1980-02-22
Proefschrift nr. 792
Samenvatting door auteur toon abstract
A mathematical model is developed to simulate transient unsaturated flow above a shallow water-table. The unsaturated zone, here extending from just below the phreatic level to soil surface, is schematized into a root zone and a subsoil. In the root zone the gradient of the hydraulic potential is assumed equal to zero. Vertical flow in the subsoil is described by a combination of steady-state situations corresponding to the upper and lower boundary flux, respectively. Transient flow is solved by a sequence of steady-state situations, subject to boundary flux conditions at the soil surface and from below the water table. The solution uses time increments of the order of days and is efficient in terms of computer costs.
To verify the model for an actual field situation, it is linked at the upper boundary to a model for evapotranspiration and at the lower boundary to a model for two-dimensional horizontal saturated flow. The resulting quasi three-dimensional model is applied to a field-size flow problem. Results agree closely with observed water-table elevations. The composite model is further used to predict consequences of groundwater extraction.

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Trefwoorden (cab) hydraulisch geleidingsvermogen / hydrodynamica / infiltratie / modellen / poreus medium / simulatie / simulatiemodellen / bodemwater
Rubrieken Bodemfysica
Publicatie type Proefschrift
Taal Engels
Toelichting Voor het numeriek oplossen van stromingsvergelijkingen worden eindige elementen- en eindige differentiemethoden gebruikt. De eindige elementenmethode biedt voordelen bij het oplossen van gecompliceerde verzadigde-onverzadigde stromingsproblemen en in gevallen waarbij het gebruik van een onregelmatig netwerk wenselijk is. De methode wordt pas sinds kort toegepast voor het oplossen van stromingsproblemen in poreuze media.
Toelichting (Engels) The present study is part of a comprehensive research project carried out by the 'Commissie Waterhuishouding Gelderland'
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