Tutorial 3-Creating the model objects

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In this lesson we will create the objects required for the turnover model. In the same way as in Tutorial 2-Creating a compartment model, you will use the Model window? to create blocks in the Interaction matrix.

Creating blocks

1. Open the Model window?.

2. Create the following objects, by right-clicking in the matrix and selecting objects from the pop-up menu. You can see the positions of the different objects in the picture below.

Name	Type	Full name	Symbol	Image
Source	Source	Atmospheric Source		"media/Atmoshpere.jpg"
Upper_Soil	Compartment	Upper soil layer	AUpper	"media/Soil 3.jpg"
Lower_Soil	Compartment	Lower soil layer	ALower	"media/Soil.gif"
Sink	Sink			"sources/Drain.jpg"
Deposition	Transfer	Deposition transfer rate
Upper_to_Lower	Transfer Coefficient	Perculation transfer rate coefficient
Lower_to_Sink	Transfer Coefficient	Perculation transfer rate coefficient

Creating parameters

Rather than specifying the initial conditions and transfer rate coefficients directly, we will create parameters for these values. This approach makes it possible to perform probabilistic analysis, sensitivity analysis and parameter optimization. It also makes it easier to enter and review the values.

1. Open the Blocks window. The table lists the seven blocks of the model. Enter the following value (initial condition/expression) for the Blocks. All the “Unknown values” are Parameters.

Name	Value
Deposition	"input"
Lower_Soil	"ic"
Lower_to_Sink	"TC"
Upper_Soil	"ic"
Upper_to_Lower	"TC"

Next

• Creating vector and matrix parameters (3/4)

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• Using index lists

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