Partially penetrating wells in a Dupuit type fresh/salt finite-element model
van der Eem, J.P. (1989). Partially penetrating wells in a Dupuit type fresh/salt finite-element model. Natuurwet. Tijdschr. 70(1-4): 210-219
In: Natuurwetenschappelijk Tijdschrift. L. Walschot/Natuur- en Geneeskundige Vennootschap: Gent. ISSN 0770-1748, more
Also appears in:
De Breuck, W.; Walschot, L. (Ed.) (1989). Proceedings of the 10th Salt-Water Intrusion Meeting Ghent (Belgium), 16-20 May 1988. Natuurwetenschappelijk Tijdschrift, 70(1-4). Natuurwetenschappelijk Tijdschrift: Gent. 408 pp., more
For calculation of the regional position of the (sharp) interface between fresh and saline water, finite-element models with a Dupuit-Forchheimer assumption can be used. The resistance to vertical flow in an aquifer is assumed zero in such models. When, however, a partially penetrating well is abstracting (or infiltrating) water in the fresh-water zone directly on top of the salt-water layer, then the assumption can lead to a largely overestimated upconing (or depressing) of the interface. In order to get a more realistic impression of the position of the interface around the well, it is possible to compute the local vertical resistance analytically, and to take the results into account in the finite-element computations.The adapted finite-element model was tested using semi-analytical, two-dimensional solutions obtained with the vortex method. Indeed the adaption reduced the movement of the interface and showed results that agreed well with the vortex-solution. Still some differences were found, which can be explained. Finally, a semi-three-dimensional computation was made for the position of the interface at a deep-well infiltration system with one line of infiltration wells centred between lines of abstraction wells.
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