Perturbations parameters

Perturbation parameters are added or deleted using the Append ‘+’ or Delete ‘-’ buttons above the overview table.

Perturbation parameters

ID. Identification name of the perturbation.

Apply perturbation to. The type of boundary item to which the perturbation is applied. Depending on the modules included in the simulation (in the Mod­ules page), the types may be:

·         Water level

·         Discharge

·         Q/h relation

·         Global wind field

·         Distributed wind velocity

·         Distributed wind direction

·         Input to catchment

·         Output from catchment

·         AD/WQ component

AD / WQ component. The component from the Advection-Dispersion mod­ule or the state variable from the Water Quality module, when the perturba­tion is applied to AD/WQ component.

Item. Depending on the type of boundary item to which the perturbation is applied, the selected item can be:

·         Choice between wind velocity or wind direction, when the perturbation is applied to the global wind field

·         Choice between rainfall, evaporation or temperature, when the perturba­tion is applied to an input to catchment

·         Choice between runoff or net precipitation, when the perturbation is applied to an output from catchment

Boundary ID. The ID of the standard boundary condition, or the ID of the dis­tributed wind velocity or direction, to which the perturbation is applied. Bound­ary ID’s are extracted from the list of defined boundaries and it is therefore required to defined boundary conditions prior to defining perturbations.

Catchment name. The name of the catchment to which the perturbation is applied, when it’s applied to an input to catchment or output from catchment.

Standard deviation. The standard deviation which is applied for this pertur­bation. This list is populated with items specified in the Standard deviation tab, and filtered on Data type. Note that when the perturbation is applied to a Q/h relation, the corresponding standard deviation must have a data Water level.

Update in rainfall-runoff model. Activating this option will also update the rainfall-runoff simulation.