Fuzzy Rule-Based Hydrologic Models for Performance Assessment of Nuclear Waste Disposal Sites
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 11
Abstract
In this paper we describe an approach that is based on fuzzy logic (FL) to solve the groundwater flow equation in the presence of uncertain parameters. An appropriate set of fuzzy rules was developed to represent groundwater flow in saturated and unsaturated systems. These rules were derived from mathematical models based on experience and the physics of the underlying problem. This resulted in a FL-based methodology that is conceptually consistent with the process of incorporating soft/qualitative data during performance assessment efforts, and materialized in the form of a numerical code. The software fuzzy logic flow simulator is tested and applied with reasonable success to one-dimensional (1D) unsaturated flow, and 1D and two-dimensional (2D) homogeneous and heterogeneous, saturated flow systems. was also enhanced to provide estimates of the uncertainty associated with the centroid-based defuzzified predictions. Comparisons with a conventional, finite-difference numerical simulator are presented for synthetic problems and a real test case from the Waste Isolation Pilot Plant disposal site in southeastern New Mexico.
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Published In
Journal of Hydrologic Engineering
Volume 14 • Issue 11 • November 2009
Pages: 1240 - 1248
Copyright
© 2009 ASCE.
History
Received: Jan 2, 2008
Accepted: Mar 17, 2009
Published online: Oct 15, 2009
Published in print: Nov 2009
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