SCE

Revision as of 12:30, 27 October 2007

This component performs a model calibration. It finds optimal parameter values by using the SCE (Shuffle Complex Evolution) algorithm for optimization. (Duan et al., 1992) For applications, the calibration - model is inserted into the context of the SCE component. After that the parameters, their feasible range, and the optimization criterion are specified. It is possible to maximize and minimize the criterion during optimization. The process is influenzed by the number of complexes. A higher number of complexes increases the chance of finding the global optimum, but increases computing time also. In most cases this value lies between 2 and 10.

XML

<contextcomponent class="jams.components.optimizer.SCE.SCE" name="SCE">
           <var name="dirName" context="J2000g" attribute="workspaceDir"/>
           <var name="parameterIDs" value="Snow.ddf;Snow.t_thres;InitSoilWater.FCAdaptation;SoilWater.latVertDist;GroundWater.k"/>
           10.0];[-10.0>10.0];[0>10.0];[0.0>10.0];[1.0>10.0]"/>
           <var name="effMethodName" value="e2"/>
           <var name="effValue" context="J2000g" attribute="e2"/>
           <var name="MaximizeEff" value="1"/>
           <var name="NumberOfComplexes" value="5"/>
           <var name="sceFileName" value="sce_out.par"/>
           <var name="enable" value="1"/>

           [..] insert model here [..]
</contextcomponent>

Position

<model>
├─<SCE Context>
│      └─<Catchment Context/>
│              ├─<InitCatchmentContext/>
│              ├─<InitHRUContext/>
│              ├─<TemporalContext</>
│              │     ├─<HRUContext/>
│              │     └─<ReachContext/>
│              └─<EntityOutputContext>
└─</model>

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