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Solving varying density groundwater problems with a single density computer program
Maas, C.; Emke, M.J. (1989). Solving varying density groundwater problems with a single density computer program. Natuurwet. Tijdschr. 70(1-4): 143-154
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
Peer reviewed article  

Available in  Authors 

Keywords
    Computer programs
    Properties > Water properties > Density > Water density
    Water > Ground water

Authors  Top 
  • Maas, C.
  • Emke, M.J.

Abstract
    Although the principles of density-effected groundwater flow are nowadays well understood, adequately documented computer codes are still only scarcely available. Fortunately, single density computer programs are adequate enough to solve rather general regional varying density problems. It is shown that both gradually varying densities and sharp interfaces can be handled, provided that displacement of fluids is negligible during the period of observation (this does not imply steady flow! ). Density can then be regarded as a soil property. The essential feature of the method is a suitable transformation of input variables and boundary conditions, which can be performed by a simple preprocessing program. The technique is illustrated by two elementary interface problems with known analytical solutions. Subsequently, this paper presents an application of the method to the catchment area of the Amsterdam Waterworks. All calculations are performed with the original version of the USGS groundwater program MODFLOW, without any adaption of the source code.

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