Browsing by Author "Andricevic, Roko"

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    Groundwater Monitoring Network: Analysis And Design
    (St. Anthony Falls Hydraulic Laboratory, 1989-06) Andricevic, Roko
    This research presents a methodology for an optimal design of regional groundwater monitoring networks. The design of a monitoring network consists of defining the number, location and measurement frequency of observation wells. The groundwater monitoring program is known to be an expensive, time consuming and uncertain process. Of significant current interest is the problem of developing a sampling plan which will yield information that meets pre-specified criteria set by a decision maker and satisfies budget constraints.
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    Heterogeneity in Hydraulic Conductivity: Its Impact Upon Solute Transport and Correlation Structures
    (St. Anthony Falls Hydraulic Laboratory, 1991-06) Morrison, Deane T.; Andricevic, Roko
    This study presents numerical simulation of conservative solute transport in randomly heterogeneous porous media. Heterogeneity is associated with the hydraulic conductivity field, which is described by three parameters: mean [mu]y, variance[sigma]y, and isotropic correlation length [lambda]y, where Y is the natural logarithm of the hydraulic conductivity. Transport simulations are performed using a particle tracking random walk (PTRW) method which is suitable for treating convection and dispersion processes in a computationally efficient manner. The objectives of this study are three-fold. First, the correlation structures of the velocity and concentration fields are analyzed as a function of the predefined [lambda]y Second, the large-scale, spatial effects of the variable flow field on the developing solute plume are analyzed. Third, nonergodic effects are investigated. The numerical results indicate that in most of the performed simulations nonergodic effects occur. Stochastic theory predictions of longitudinal and transverse mixing differ from the computational results. These differences may be caused by the highly anisotropic velocity correlation structure, which exhibits an apparent hole-effect in the transverse direction,
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    Spatial and Temporal Analysis of Groundwater Recharge with Application to Sampling Design
    (Water Resources Research Center, University of Minnesota, 1995-07) Andricevic, Roko; Foufoula-Georgiou, Efi; Jankovic, Igor
    The most influential process for the groundwater shallow aquifer monitoring is groundwater recharge. This study focuses on defining and quantifying the groundwater recharge as a process primarily resulting from precipitation. The spatial and temporal distribution of the recharge was analyzed through a numerical experiment designed to realistically describe a shallow aquifer case. The spatial and temporal structure of the recharge was examined and quantified as a function of precipitation events and soil heterogeneity. The quantified spatial and temporal distribution of the groundwater recharge then was used to demonstrate its influence on sampling network design. It was found that the temporal variability of the recharge has a major impact on the design of groundwater flow monitoring networks.