UNSTEADY GROUNDWATER FLOW OVER SLOPING BEDS BY FINITE ELEMENTS
Abstract
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 CONDITI ...
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