30
2. Modeling in STELLA
WHALES
MORTALITY RATE
REPRODUCTION RATE
FIGURE 2.12
Next, define a new converter called MORTALITY RATE and set it to .03.
Specify the outflow as
MORTALITY = MORTALITY RATE • WHALES
(4)
after making the appropriate connections with information arrows. Your
model should now look like Figure 2.12.
Run your model again. The time profile of the whale population in your
system is seen in Figure 2.13.
3: WHALES
2: WHALES
1: WHALES
1: 2000.00
1-- 1....
/
1: 1000.00
1.-:2=3
-......
3
2
2
3
3
1:
40.00
0.00
0.00
10.00
20.00
Years
30.00
FIGURE 2.13