Dynamic Fuzzy Modeling of Storm Water Infiltration in Urban Fractured Aquifers
Publication: Journal of Hydrologic Engineering
Volume 7, Issue 5
Abstract
In an urban fractured-rock aquifer in the Mt. Eden area of Auckland, New Zealand, disposal of storm water is via “soakholes” drilled directly into the top of the fractured basalt rock. The dynamic response of the groundwater level due to the storm water infiltration shows characteristics of a strongly time-varying system. A dynamic fuzzy modeling approach, which is based on multiple local models that are weighted using fuzzy membership functions, has been developed to identify and predict groundwater level fluctuations caused by storm water infiltration. The dynamic fuzzy model is initialized by the fuzzy clustering algorithm and optimized by the gradient-descent algorithm in order to effectively derive the multiple local models—each of which is associated with a locally valid model that represents the groundwater level state as a response to different intensities of rainfall events. The results have shown that even if the number of fuzzy local models derived is small, the fuzzy modeling approach developed provides good prediction results despite the highly time-varying nature of this urban fractured-rock aquifer system. Further, it allows interpretable representations of the dynamic behavior of the groundwater system due to storm water infiltration.
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Information & Authors
Information
Published In
Journal of Hydrologic Engineering
Volume 7 • Issue 5 • September 2002
Pages: 380 - 391
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jul 24, 2001
Accepted: Jan 18, 2002
Published online: Aug 15, 2002
Published in print: Sep 2002
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