Reference & User Manual
|Last modified on: Thursday, 20-May-10 19:32 CEST|
Optimization: InstrumentsInstruments represent possible strategies, technological solutions, projects, i.e., mechanisms that can be applied to a given node to modify its behaviour; Instruments have associated costs, and change the behaviour of the node. Depending on the type, they can modify various node characteristics such as costs, water demand, losses, flows, allocation rules, etc.
Instruments are selected from the Water Technologies data base. Their specific parameter are adapted for the node specific situation.
Instrument Selection and Configuration
The selection and configuration mechanism for INSTRUMENTS is described with the optimization scenario. Instruments can be applied to various degrees between a minimum and a maximum application rate specified for any instrument/node combination. The probability of selecting and configuring and instrument can be scaled with a weight factor.
Instruments can be applied
Instruments are grouped by the class of nodes (node types) they can be applied to. Applicable NODE TYPES are:
INSTRUMENTS for DEMAND NODESInstruments for DEMAND NODES are currently available in the water technology data base for the domains: demand (generic), agriculture, and domestic.
In the optimization, they affect the following four model parameters or processes with a multiplier:
INSTRUMENTS for START NODESInstruments for START NODES simply define a multiplier for the (in)flow to the basin. This is only applicable for START NODES of the subtypes:
The only exception is water harvesting where the flow is calculated dynamically from precipitation data (given an effective collection area and a collection efficiency parameter). A water harvesting technology specifies a maximum collection area and a collection efficiency together with a minimum and maximum application or installation rate and the associated economic (investment and operating cost together with the reference unit).
INSTRUMENTS for RESERVOIR NODESInstruments for RESERVOIR NODES can affect losses (evaporation or seepage) on existing reservoirs, change the dead storage (e.g., by dredging) or they provide an alternative (additional) reservoir alltogether. This isrepresented by the followoing parameters:
INSTRUMENTS for DIVERSIONSInstruments for DIVERSION NODES can affect any or all of:
INSTRUMENTS for RECHARGE NODESThe only type of instrument for a recharge node can affcte
INSTRUMENTS for TREATMENT NODESInstruments for the tretament node apply mainly to the STREAM water quality models scneraios; The integratiob of WRM and STREAM for optimization is still under development. However, parameters affect (together wth the associated cost factors of investment and operating costs) include: