The simulation was done using Professional DYNAMO 4 (PD4) software. This is to see whether the graph simulated follows the reference mode that the proponents had earlier in chapter 1. First is to provide a script for the software in order to achieve the desired simulation. The code for the script is shown below.
DYN File Script:
NOTE FAREA = Forest Area
L FAREA.K=FAREA.J+DT*(YTREES.J+MTREES.J+DEFOR.JK)
N FAREA=716200
NOTE YTREES= Young Trees
L YTREES.K=YTREES.J+DT*(MTREES.J-YTREES.JK)
N YTREES=0
NOTE TPLANT.K = Trees Planted
L TPLANT.K=TPLANT.J+DT*(PRATE.JK)
N TPLANT=0
NOTE MTREES.K = Mature Trees
L MTREES.K=MTREES.J+DT*(MATUR.JK)
N MTREES=0
NOTE PRATE.KL = Planting Rate
R PRATE.KL=DEFOR.KL
NOTE DEFOR.KL = Deforestation Due to Logging
R DEFOR.KL=K*(-FAREA.K)
C K=0.029
NOTE MATUR.KL = Maturity Rate
R MATUR.KL=DELAY1(PRATE.KL,19.46)
SPEC DT=0.125/SAVPER=.25/LENGTH=50
NOTE Time is in years
SAVE FAREA,YTREES,MTREES,DEFOR DRS Script
PLOT"FOREST AREA"
<FAREA "Forest Area">
<DEFOR "Deforestation Rate">
Using the script above, the proponents simulated the model and showed the result in Figures 4-1, 4-2, and 4-3. In Figure 4-1, it is seen that there is a direct relationship with each other. If the deforestation increases the forest area decreases, it is also observed that the graph for both variables follows an oscillation. The cause of oscillation is shown in Figure 4-2 and 4-3.
Figure 4‑1: Forest Area and Deforestation
Figure 4‑2: Forest Area, Young Trees, Mature Trees
Figure 4-2 shows the cause of oscillation with respect to the forest area, it is mostly because of the trees that were planted. If the mature tree is being depleted, the graph of the forest area follows its curve, this is the same when the mature trees are plenty and it is seen around year 20, since there is a delay before the mature trees grow.
Figure 4‑3: Deforestation, Young Trees, Mature Trees
Figure 4-3 summarizes the oscillations between the deforestation and the trees that were planted. When the number of mature trees is bountiful, the deforestation rate goes up, while if the mature trees are not bountiful the deforestation goes down since they cannot cut the young trees in the forest.
Chapter 4 : Analysis of Data
The simulation was done using Professional DYNAMO 4 (PD4) software. This is to see whether the graph simulated follows the reference mode that the proponents had earlier in chapter 1. First is to provide a script for the software in order to achieve the desired simulation. The code for the script is shown below.DYN File Script:
NOTE FAREA = Forest Area
L FAREA.K=FAREA.J+DT*(YTREES.J+MTREES.J+DEFOR.JK)
N FAREA=716200
NOTE YTREES= Young Trees
L YTREES.K=YTREES.J+DT*(MTREES.J-YTREES.JK)
N YTREES=0
NOTE TPLANT.K = Trees Planted
L TPLANT.K=TPLANT.J+DT*(PRATE.JK)
N TPLANT=0
NOTE MTREES.K = Mature Trees
L MTREES.K=MTREES.J+DT*(MATUR.JK)
N MTREES=0
NOTE PRATE.KL = Planting Rate
R PRATE.KL=DEFOR.KL
NOTE DEFOR.KL = Deforestation Due to Logging
R DEFOR.KL=K*(-FAREA.K)
C K=0.029
NOTE MATUR.KL = Maturity Rate
R MATUR.KL=DELAY1(PRATE.KL,19.46)
SPEC DT=0.125/SAVPER=.25/LENGTH=50
NOTE Time is in years
SAVE FAREA,YTREES,MTREES,DEFOR
DRS Script
PLOT"FOREST AREA"
<FAREA "Forest Area">
<DEFOR "Deforestation Rate">
PLOT "FOREST AREA"
<FAREA "Forest Area">
<YTREES "Young Trees">
<MATUR "Maturity Rate">
PLOT "DEFORESTATION RATE"
<DEFOR "Deforestation Rate">
<YTREES "Young Trees">
<MATUR "Maturity Rate">
Using the script above, the proponents simulated the model and showed the result in Figures 4-1, 4-2, and 4-3. In Figure 4-1, it is seen that there is a direct relationship with each other. If the deforestation increases the forest area decreases, it is also observed that the graph for both variables follows an oscillation. The cause of oscillation is shown in Figure 4-2 and 4-3.
Figure 4-2 shows the cause of oscillation with respect to the forest area, it is mostly because of the trees that were planted. If the mature tree is being depleted, the graph of the forest area follows its curve, this is the same when the mature trees are plenty and it is seen around year 20, since there is a delay before the mature trees grow.
Figure 4-3 summarizes the oscillations between the deforestation and the trees that were planted. When the number of mature trees is bountiful, the deforestation rate goes up, while if the mature trees are not bountiful the deforestation goes down since they cannot cut the young trees in the forest.