Estimation of Hydraulic Diffusivity in Stream-Aquifer System
Publication: Journal of Irrigation and Drainage Engineering
Volume 125, Issue 2
Abstract
The Laplace transform of convolution equation, which relates aquifer response to boundary perturbation, expresses explicitly the hydraulic diffusivity in terms of the Laplace transform parameter, changes in stream stage, and fluctuations of piezometric level at a point near the stream. Hydraulic diffusivity has been estimated using the Laplace transform approach. The diffusivity has also been determined from observed response of an aquifer and the boundary perturbation using the Marquardt method, a least-squares optimization technique. If the observed data are free from random error, the diffusivity can be estimated accurately using the Laplace transform approach. Unlike the least-squares optimization method, the Laplace transform technique automatically gives less weight to the latter part of the aquifer response and thereby to the random error contained in it. Discrete kernel coefficients have been derived, using which the water level rise in an aquifer that can be predicted for any variation in stream stage.
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Information & Authors
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Published In
Journal of Irrigation and Drainage Engineering
Volume 125 • Issue 2 • March 1999
Pages: 74 - 81
History
Received: May 15, 1997
Published online: Mar 1, 1999
Published in print: Mar 1999
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