Sensitivity analyses of pumping test in salt-fresh water aquifer: 2. Drawdown and joint confidence regions
Lebbe, L.; Van Meir, N. (2000). Sensitivity analyses of pumping test in salt-fresh water aquifer: 2. Drawdown and joint confidence regions, 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. 1-10
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., meer
Using an inverse numerical model HYPARIDEN it is examined if the planned observation wells provide sufficient data to infer the vertical and horizontal conductivities along with the specific elastic storage. Utilising an axial-symmetric numerical model the drawdowns which would occur in the planned observation well are generated and an error is added. With the inverse numerical model the optimal values of the three hydraulic parameters are deduced along with a number of statistical parameters. The relations between these statistical parameters and the approximate joint confidence region are given. It is shown that the planned observation wells will generate a well-posed problem for the identification of the hydraulic parameters. From the drawdown data the horizontal conductivity can be inferred with the highest accuracy, the vertical conductivity with the smallest accuracy. By the adding the concentration sensitivities, as calculated with the MOCDENS3D model, the hydraulic parameter identification problem becomes even better posed. The concentration data describing the rise of the fresh-salt water transition zone provide valuable data for the inference of the vertical conductivities and so enrich the parameter identification problem.
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