Contribution of indicator geostatistics and mathematical morphology to the characterisation of aquifer heterogeneities in the vicinities of waste disposal sites

Abstract:

In order to study groundwater flow and contaminant transport it is very important to model the aquifer heterogeneities in terms of the spatial distribution of its hydrostatigraphic units. These units can vary strongly in thickness and can also be geometrically anisotropic and present different features concerning its neighbourhood relationships. In order to take into account these spatial features, a non parametric geostatistics is applied to a binary coded lithological data. The information extracted from the variograms of these indicator variables can then be used to characterise the mutual arrangements between the different stratigraphic units, namely the neighbourhood relationships. In a 2nd phase, a particular emphasis is given to the characterisation of 3D contiguity between the stratigraphic units. Here the use of Mathematical Morphology tools can help to identify important features, establishing the graph of neighbourhood relationships. This 3D aquifer model can then be used to evaluate the ability of the model to pbkp_redict the uncertainty of the diffusion of the contaminant dispersion plume in the vicinities of waste disposal sites. The model is tested in a real case study in the aquifer system of Tejo.

Año de publicación:

1997

Keywords:

Fuente:

scopus