DDT Models

described in chapter 22 in the 2nd Edition
and in Chapter 12 of the 1st Edition


DDT Model from Fig 12.10 of the 1st Edition. This is a Stella file, constructed in Ver 9.1 for Windows.
It works best if you save the file to your computer before trying to open.

DDT Model from Fig. 12.14 of the 1st Edition . This is a Stella file, constructed in Ver 9.1 for Windows.
It works best if you save the file to your computer before trying to open.

If you don't have Stella, Ver 9.1 for Windows, you could build the models from scratch based on the
diagrams in the 1st edition and the equations provided below.

Stella equations for Randers' Model of DDT in the Environment
Build this model and run the model with DT set to 0.02 years.
You should be able to verify the results in Figure 12.13 and in Table 12.2 of the 1st Edition.

Stella equations for the Revised Model of DDT in the Environment
This is the model shown in Figure 12.14 of the 1st Edition.
you may run this model with a higher value of DT (i.e., 0.125 years).
You should be able to verify the results in Figure 12.15 and in Table 12.2 of the 1st Edition.