Lynn Gelhar | Massachusetts Institute of Technology (MIT) (original) (raw)

Papers by Lynn Gelhar

L'approche stochastique des écoulements souterrains. Symposium, 1985

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The development and testing of a computer based mathematical model simulating simultaneous transp... more The development and testing of a computer based mathematical model simulating simultaneous transport of heat (or a dissolved solute) and water in a saturated single-phase groundwater flow system are described. The formulation of the underlying flow and transport equations is presented and the discretization of these equations is developed using the standard Galerkin finite element method, and the upstream weighted residual finite element technique. A computer code is developed to solve the discretized equations; instructions for data preparation and use of the code are included. The new upstream weighted residual technique is evaluated by comparing the simulated results with the analytical solution for a plume dispersing from a point source in a uniform flow. These comparisons demonstrate that the upstream weighted residual technique has distinct advantages over the standard Galerkin finite element method in terms of accuracy and computational efficiency.

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The variability of saturated hydraulic conductivity of the aquifer material is now recognized as ... more The variability of saturated hydraulic conductivity of the aquifer material is now recognized as a primary factor controlling the movement and spreading of solutes in ground water. The borehole flowmeter method discussed in this report is a promising field technique for measuring the vertical profile of horizontal hydraulic conductivity on a routine basis. By measuring profiles at different locations, a three-dimensional view of the hydraulic conductivity field is obtained. The flowmeter used in this study, which has a light-weight impeller (spinner) that rotates in responses to water moving vertically up or down the inside of the well, is calibrated in the laboratory to yield volumetric flow. For multiple flow states (i.e., before pumping the well and during pumping of the well, or during pumping at two different discharge rates) the flowmeter is used to obtain profiles of the discharge in the well along the entire screened length. From the vertical flow profiles, the mean radial f...

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The main purpose of the conference was to examine the applicability of geostatistical methods in ... more The main purpose of the conference was to examine the applicability of geostatistical methods in hydrogeological modeling. Discussion focused on geostatistical descriptions of hydrogeological parameters in heterogeneous geological systems; the application of stochastic methodology in hydrogeology, including Monte Carlo simulation and the solution of stochastic differential equations; and methods of model calibration under uncertainty, with a view toward resource management. These topics have implications for both the direct and inverse simulation of ground-water hydraulics and for the transport of contaminants through hydrogeologic systems. (RWR)

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This document describes a comprehensive field study for evaluating the effects of site variabilit... more This document describes a comprehensive field study for evaluating the effects of site variability on flow and transport of contaminants in the unsaturated zone. The field study is designed to measure the variability of key hydraulic properties within the unsaturated zone of an undisturbed field soil. A large trench, 5 m wide x 6.5 m deep x 25 m long, will be used to observe the transport of contaminants. Flow of water-coincident contaminants through the unsaturated zone will be monitored, and comparisons will be made between predicted and field-measured values. In addition, a controlled lysimeter test has been initiated to look at the effects of well-defined layering on transport processes. The stochastic model of Gelhar will be tested using the field and lysimeter test data. In this model, the fluctuations of measured hydraulic parameters are assumed to represent statisically homogeneous random fields. The mean values of these parameters and their covariance functions will provide...

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$Research paper thumbnail of Stochastic analysis of flow and solute transport in a variable-aperture rock fracture$

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ABSTRACT Leaf 195 omitted. Massachusetts Institute of Technology. Dept. of Civil Engineering. The... more ABSTRACT Leaf 195 omitted. Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1974. Ph. D. Vita. Bibliography: leaves 295-306.

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ABSTRACT Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1993... more ABSTRACT Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1993. Includes bibliographical references (leaves 147-151). by Vivek Kappor. Sc.D.

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L'approche stochastique des écoulements souterrains. Symposium, 1985

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$Research paper thumbnail of Stochastic analysis of flow and solute transport in a variable-aperture rock fracture$

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