HYDRO-ISOTOPE MIXING CELL MODEL FORASSESSING FLUXES IN COMPLEX AQUIFERSUNDERGOING TRANSIENT HYDROCHEMICALAND ISOTOPIC EVOLUTION

摘要

The aim of this study was to develop a fl ow model that will enable identifi cation ofthe hydraulic parameters and quantitative calculation of groundwater fl uxes in a complexand transient hydrogeological system in which the piezometric heads and the spatialdistribution of solutes varies with time. In such a system the boundaries and hydrologicalconditions along the boundaries are not suffi ciently clear or distinct, and there is a lack ofhydrogeological and hydrochemical information. Thus it is diffi cult to construct, solve andcalibrate a hydrological model based on the continuity equation. The algorithm proposedin this study is therefore based on a more simplistic approach in which the fl ow domainis subdivided into pseudo-homogeneous fl ow cells forming a multi-compartmental fl owmodel. The creation of the multi-compartmental structure is based on spatial distributionof dissolved ions and isotopes in a transient hydrological system.