Use of an autocalibration to evaluate the consistency of a data-set in relation to geochemical model formulations
Ouboter, M.R.L.; De Rooij, N.M. (1990). Use of an autocalibration to evaluate the consistency of a data-set in relation to geochemical model formulations, in: ModelCARE 90: Calibration and reliability in groundwater modelling. IAHS-AISH publication, 195: pp. 195-202
A groundwater system is often characterized by a large chemical complexity. Values of pH, cation exchange capacity, and cationic composition of the exchange complex can vary in time and space. The values of the model parameters controlling cation adsorption seem to be dependent on the system. In many geochemical models, a system definition is derived from a database containing fixed numbers. The modeling of a groundwater system with a database-derived system definition may, in some cases, be impossible. The optimal parameter set should be found before starting the modelling of the groundwater system. To obtain the optimal parameter set, a geochemical model (CHARON) was adapted for an autocalibration application. The principal of autocalibration lies in the minimalization of the differences of calculated and laboratory values. Using a method of autocalibration a parameter set can be derived which is able to represent field data. The method was used to determine the model parameters for two data sets. The results of the model application successfully described the adsorption of heavy metals (i.e., cadmium) to suspended solids in a surface water system by reproducing the measured values in the two data sets.
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