Laplace Transform Analytic Element Method: A Semi-analytic Solution for Transient GroundwaterFlow Simulation - Softcover

Kuhlman, Kristopher

Softcover

ISBN 10: 3639074319 ISBN 13: 9783639074314

Publisher: VDM Verlag, 2008

Synopsis

The Laplace transform analytic element method(LT-AEM), applies the traditionally steady-stateanalytic element method (AEM) to theLaplace-transformed diffusion equation (Furman andNeuman, 2003). This strategy preserves the accuracyand elegance of the AEM while extending the method totransient phenomena. The approach taken hereutilizes eigenfunction expansion to derive analyticsolutions to the modified Helmholtz equation, thenback-transforms the LT-AEM results with a numericalinverse Laplace transform algorithm. Thetwo-dimensional elements derived here include thepoint, circle, line segment, ellipse, and infiniteline, corresponding to polar, elliptical andCartesian coordinates. Each element is derived forthe simplest useful case, an impulse response due toa confined, transient, single-aquifer source. Theextension of these elements to include effects due toleaky, unconfined, multi-aquifer, wellbore storage,and inertia is shown for a few simple elements (pointand line), with ready extension to other elements. General temporal behavior is achieved usingconvolution between these impulse and general timefunctions; convolution allows the spatial andtemporal components of an element to be handledindependently.

About this title

About the Author

Kris obtained a BS degree in Geological Engineering from ColoradoSchool of Mines. He worked for the hydrological consulting firmGEOSCIENCE Support Services in Los Angeles before obtaining hisPhD in Hydrology from the University of Arizona, under theadvisement of Shlomo P. Neuman. Kris now works at SandiaNational Laboratories.

Edition details

• Publisher: VDM Verlag
• Publication date: 2008
• ISBN 10: 3639074319
• ISBN 13: 9783639074314
• Binding: Paperback
• Language: English
• Number of pages: 172