Fuzzy Rule-Based Hydrologic Models for Performance Assessment of Nuclear Waste Disposal Sites

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 ma...

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Bibliographic Details
Published in:Journal of hydrologic engineering 2009, Vol.14 (11), p.1240-1248
Main Authors: Bagtzoglou, Amvrossios C, Ababou, Rachid, Nedungadi, Ashok, Sagar, Budhi
Format: Article
Language:English
Subjects:
Assessment
Computer programs
Computer simulation
Estimates
Finite difference method
Flow equations
Fuzzy
Fuzzy logic
Fuzzy set theory
Fuzzy sets
Groundwater
Groundwater flow
Heterogeneity
Hydrology
Mathematical analysis
Mathematical models
Methodology
Nuclear waste disposal
Performance assessment
Pilot plants
Radioactive materials
Software
TECHNICAL PAPERS
Two dimensional
Uncertainty
Unsaturated
Waste disposal
Wastes
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Summary: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 ( FLO2 SIM ) 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. FLO2 SIM 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.
ISSN:1084-0699
1943-5584
DOI:10.1061/(ASCE)1084-0699(2009)14:11(1240)