Hydrogeologic facies models to delineate large-scale spatial trends in glacial and glaciofluvial sediments

Caractérisation hydrogéologique des hydrofaciès dans le paléodelta de la rivière Valin au Saguenay /

“…Selon Anderson (1989), un hydrofaciès peut être défini comme un milieu anisotrope qui se caractérise par sa dimension, sa géométrie et ses propriétés hydrogéologiques, principalement la conductivité hydraulique, dont la valeur peut varier de plusieurs ordres de grandeur. Donc, un hydrofaciès peut se caractériser par une gamme (un intervalle) déterminée de valeurs de conductivité hydraulique.…”

Stochastic modelling of groundwater flow and solute transport in aquifers

“…As one approach to the problem of quantifying uncertainty in solute transport in porous media using stochastic methods, I suggest the following steps (1) groundwater hydrologists should utilize the principles of stratigraphy, sedimentology, and structural geology to delineate large-scale geologic units or structures which may contain the likely paths along which groundwater travels (Williams, 1988;Anderson, 1989). (2) 'Enough' data should be collected to characterize the hydrologic properties of as many geologic units as possible so that the general flow regime in those units can be defined.…”

“…In a basin-scale aquifer, the hydraulic conductivity field is likely to be non-stationary because of changes in depositional environments which may contain heterogeneities of a variety of scales (e.g. Anderson, 1989). How to incorporate such a (Dagan, 1987) feature in the approach remains to be explored.…”

“…Furthermore, since models based on the effective parameters predict the bulk behaviour of aquifers, the discrepancy between the bulk behaviour and the behaviour observed at scales much smaller the REV must be addressed. The stochastic perturbation-spectrum method to be discussed in the following paragraphs provides a means to resolve these problems although debate on the concept of the effective parameter continues (see Smith and Freeze, 1979;Anderson, 1989).…”

Measurement of anisotropic hydraulic conductivity in unconsolidated sands: A case study from a shoreface deposit, Oyster, Virginia

“…In sedimentary deposits, structures such as grain fabric, bedding, and laminations have been shown to affect the magnitude of hydraulic conductivity (K) as well as its anisotropy [Mast and Potter, 1963]. However, the effects of these small-scale features on the magnitude and anisotropy of hydraulic conductivity have not been studied in detail [Anderson, 1989]. An important objective of this paper is to demonstrate a method for measuring anisotropic hydraulic conductivity at the scale of bedding structures in unconsolidated sediment.…”