Abstract
Abstract The present paper contributes to the development and discussion on fuzzy cognitive map (FCM)-based theory for inventive problem solving (TRIZ) for sustainable sediment management in reservoirs. FCM combines aspects of fuzzy logic, neural networks, semantic networks, expert systems, and nonlinear dynamical systems. TRIZ is a constructive methodology that includes practically reproducible models and methods that allow the development of new inventions as well as the teaching of the process, the models, and the methods of creating inventions. A proposed approach in this paper is an improvement methodology that is designed to bring about rapid improvements/changes to processes by defining and implementing the changes that can be quickly identified and easily implemented, thereby reducing the cost and time to bring about improvement and change in reservoirs. Results of this study provide a road map for how to introduce FCM and TRIZ into local sustainable sediment management with consideration of technical and executive requirements, economic factors, social welfare, and environmental impacts.
Highlights
The reduced rate of dam construction throughout the world combined with storage loss due to reservoir sedimentation currently results in more storage being lost annually than is added
Consideration of technical and executive requirements, economic factors, social welfare, and environmental impacts should be the used combination of alternatives to extend the useful life of reservoirs
To assist in the development of a sediment management plan based on both public participation and expert knowledge, we propose the use of fuzzy cognitive maps (FCMs) as a semi-quantitative model tool that provides a structured, simple, and inexpensive way to model overall fluvial systems through a soft evaluation of the relationship between different concepts and factors interpreted by stakeholders
Summary
The reduced rate of dam construction throughout the world combined with storage loss due to reservoir sedimentation currently results in more storage being lost annually than is added. This problem is further exacerbated by population growth, which results in a sharply declining storage volume per capita. Based on the literature and existence experiences, a list of alternatives for sediment management in dam reservoirs can be categorized as follows (Khakzad & Elfimov 2014a). (1) Reducing sediment inflows: watershed management, upstream check structures, reservoir bypass, off-channel storage. (2) Managing sediments within the reservoir: operating rules, tactical dredging. The cost and applicability of each strategy will vary from one site to another and study of sites will create appreciation of the complexity of sediment problems and the way in which they can be controlled (Khakzad & Elfimov 2014b, 2015)
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