The rate at which groundwater moves through an aquifer is not usually directly measurable, and thus it must be estimated from knovm relationships among measurable parameters. The discussion of groimdwater flow [Pg.225]

A technique for determination of effective aquifer surface area in contact with percolating ground water has been presented. The method utilizes laboratory-determined chemical kinetic dissolution data with geologic, hydrologic, and ground-water-quality data to yield an estimate of effective aquifer surface area, a parameter not obtained by other techniques. [Pg.791]

Important issues in groundwater model validation are the estimation of the aquifer physical properties, the estimation of the pollutant diffusion and decay coefficient. The aquifer properties are obtained via flow model calibration (i.e., parameter estimation see Bear, 20), and by employing various mathematical techniques such as kriging. The other parameters are obtained by comparing model output (i.e., predicted concentrations) to field measurements a quite difficult task, because clear contaminant plume shapes do not always exist in real life. [Pg.63]

Hints and Help Assume, as a first approximation, that water temperature is a conservative, nonretarded parameter. You can then interpret the fw value calculated for PCE as a retardation factor relative to water temperature. Then you may try to estimate the retardation of water temperature. To do so it may be helpful to assume, as a rough estimate, an average value for the specific heat of the solids in the aquifer, cp, of 1 J g- K-. [Pg.1181]

Rouen D, Scher H, Blunt M (1997) On the structure and flow processes in the capillary fringe of phreatic aquifers. Transp Porous Media 28 159-180 Rose CW (1993) The transport of adsorbed chemicals in eroded sediments. In Russo D, Dagan G (eds) Water flow and solute transport in soils. Springer, Heidelberg, pp 180-199 Rosenberry DO, Winter TC (1997) Dynamics of water-table fluctuations in an upland between two prairie-pothole wetlands in North Dakota. J Hydrol 191 266-289 Russo D (1997) On the estimation of parameters of log-unsaturated conductivity covariance from solute transport data. Adv Water Resour 20 191-205 Russo D, Toiber-Yasur 1, Laufer A, Yaron B (1998) Numerical analysis of field scale transport of bromacU. Adv Water Resour 21 637-647 [Pg.400]

© 2019 chempedia.info