Sensitivity analyses of a pumping test in a fresh-salt water aquifer: 1. Concentration changes
Van Meir, N.; Lebbe, L.; Oude Essink, G.H.P. (2000). Sensitivity analyses of a pumping test in a fresh-salt water aquifer: 1. Concentration changes, in: Sadurski, A. (Ed.) Hydrogeology of the Coastal Aquifers: Proceedings of the 16th Salt Water Intrusion Meeting, Miedzyzdroje-Wolin Island (Poland) 12-15 June 2000. pp. 1-12
In: Sadurski, A. (Ed.) (2000). Hydrogeology of the Coastal Aquifers: Proceedings of the 16th Salt Water Intrusion Meeting, Międzyzdroje-Wolin Island (Poland) 12-15 June 2000. Nicolaus Copernicus University: Torun. ISBN 83-231-1286-X. 188 pp., more
A density dependent groundwater flow model, MOCDENS3D (Oude Essink, 1998) is used to simulate the upconing of a fresh-salt water interface. The conceptual model is based on geological and hydrogeological information as found in the central part of the Belgian Coastal Plain. The modelled area is 1600 m2 and the deposits are 40 m thick. This area is divided into 80 columns and 80 rows each with a length and width of 0.5 m. There are 20 layers with varying thickness. The upconing was simulated without any stability problems or significant numerical dispersion, although it required substantial computer memory and computing time. These results were then used for sensitivity analyses. Considering the variation of salt water concentration in the vicinity of the fresh-salt water interface the most sensitive parameter is the vertical conductivity, followed by the horizontal conductivity and in decreasing order of sensitivity: the porosity, the specific elastic storage and the longitudinal dispersivity. The transverse dispersivity has such a small sensitivity that it becomes an unidentifiable parameter.
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