ΑΣΤΑΘΗΣ ΡΟΗ ΤΟΥ ΥΠΟΓΕΙΟΥ ΝΕΡΟΥ ΣΕ ΚΕΚΛΙΜΕΝΑ ΥΔΡΟΦΟΡΑ ΣΤΡΩΜΑΤΑ ΜΕ ΠΕΠΕΡΑΣΜΕΝΑ ΣΤΟΙΧΕΙΑ

STUDY OF THE SOLUTION OF UNSTEADY TWO-DIMENSIONAL GROUNDWATER FLOW OVER SLOPINGBEDS BY A FINITE ELEMENT MODEL. THE GOVERNING EQUATIONS HAVE BEEN OBTAINED BY TWO WAYS. FIRST, THE DIFFERENTIAL EQUATION BASED ON THE ASSUMPTION OF NEARLY HORIZONTAL FLOW IS DERIVED, VALID FOR SMALL ANGLES OF INCLINATION. NEXT, THE EQUATION BASED ON THE ASSUMPTION THAT THE STREAMLINES ARE NEARLY PARALLEL TO THE SLOPING BED, IS PRESENTED. A FINITE ELEMENT METHOD, USING THE GALERKIN TECHNIQUE WITH TRIANGULAR ELEMENT IS USED TO INTEGRATE THE DIFFERENTIAL EQUATION IN SPACE. THE RESULTING MATRIX EQUATION IS INTEGRATED IN TIME USING A FINITE DIFFERENCESCHEME. THE MODEL CAN BE APPLIED IN A VARIETY OF PROBLEMS AND BOUNDARY CONDITIONS. THUS, THE AQUIFER CAN BE PHREATIC OR CONFINED, OR A COMBINATION OF THE TWO, LEAKY OR NON- LEAKY, UNDER TRANSIENT OR STEADY STATE CONDITIONS. PUMPING AND RECHARGE WELLS, SPRINGS, DRAINS, EVAPOTRANSPIRATION, LATERAL INFLOWS AND OUTFLOWS, STREAMS, LAKES AND NUMEROUS OTHER BOUNDARY CONDITIONS ARE ACCOUNTED FOR. EXAMPLES ARE PRESENTED TO ESTABLISH THE VALIDITY AND ACCURACY OF THE MODEL BY COMPARISON TO ANALYTICAL SOLUTIONS AND EXPERIMENTAL RESULTS. IN THESE EXAMPLES THERESULTS OF THE TWO OBTAINED DIFFERENTIAL EQUATIONS ARE ALSO COMPARED FOR DIFFERENT CASES AND BED SLOPES.

Grantor dc:publisher

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

Year dc:date

1990

Authors dc:creator

• Καλαϊτζίδου-Πάϊκου, Νίκη
• Kalaidzidou-Paikou, Niki

• Finite elements
• GROUNDWATERFLOW
• SLOPING AQUIFERS
• UNSTEADY FLOW
• ΑΣΤΑΘΗΣ ΡΟΗ
• ΚΕΚΛΙΜΕΝΟΙ ΥΔΡΟΦΟΡΕΙΣ
• Πεπερασμένα στοιχεία
• Νερά, Υπόγεια
• Γεωπονικές Επιστήμες και Κτηνιατρική
• Agricultural and Veterinary Sciences
• Γεωπονία, Δασολογία και Αλιεία
• Agriculture, Forestry and Fisheries

Language dc:language

gre

Identifier

10.12681/eadd/1239

OAI identifier oai:identifier

oai:10442/1239