OPTIMA: optimisation strategyThe optimisation of the WRM water resources model scenarios is a central component in OPTIMA.
The start point is defined by
The baseline scenario is extended to include a very basic economic evaluation of costs and benefits of water supply and demands met.
The basic WRM model has been extended with tools and functions for a basic economic assessment in terms of distributed:
The economic criteria are part of the overall scenario results, and a detailed economic summary provides a sectoral assessment. This basic economic assessment provides the basis for Optimization: given a set of objectives and constraints, as well as instruments (policy measures, management alternatives, or structural, technological change) the optimization model will find the most efficient combination of measure or instruments to meet the constrain ts and further the objectives.
A multi-stage, multi-objective, multi-criteria optimization approach is used, based on the full node by node daily resolution of the dynamic simulation model, implemented as a combination of heuristics, local gradient search, a genetic programming framework, a discrete mult-criteria method combining a satisficing screening level to generate feasible and non-dominated pareto efficient solutions for a subsequent interactive discrete multi-criteria (reference point) approach to identify effcient compromise solutions.
A similar hybrid approach is under development for the STREAM water quality model.
The baseline scenario should be presented to, and discussed with, the stakeholders for each case study to incorporate their comments and suggestions as an important step towards acceptance of the eventual results.
The baseline scenario is now extended for optimisation by
For INSTRUMENTS, there is an on-line Water Technologies Data Base that includes both generic and location specific instruments from which initial and default values can be extracted when editing an optimization scenario:
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