Ekolosko modelovanje-Vezbe-Fakultet za primenjenu ekologiju, Vežbe' predlog Primena ekoloskog modelovanja. Univerzitet u Beogradu
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Ekolosko modelovanje-Vezbe-Fakultet za primenjenu ekologiju, Vežbe' predlog Primena ekoloskog modelovanja. Univerzitet u Beogradu

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Microsoft Word - PEM VEŽBA I

VEŽBA I-a

Initial time = 0 Final tine = 100 Time step = 1 Units of time = Month

Population 8,000

6,000

4,000

2,000

0 0 10 20 30 40 50 60 70 80 90 100

Time (Month) Population : Current

VEŽBA I-b

Ispitati kako različite vrednosti parametara Inflow Rate i Outflow Rate utiču na nivo vode u rezervoarau.

Rezultat za Inflow Rate = 1/10 i Outflow Rate = 1/5

Water content 60

50

40

30

20 0 10 20 30 40 50 60 70 80 90 100

Time (Hour)

Li te

rs

Water content : Current

Juan Martín García – Theory and Practical Exercises of System Dynamics 195

INITIAL TIME = 2000 FINAL TIME = 2050 TIME STEP = 1

Units for time = year

STOCKS adults = +maturity-old age-deaths of adults

Initial value: 500000

Units: persons

young people =+births-maturity-deaths of young people

Initial value: 400000

Units: persons

elderly people = +old age-natural deaths

Initial value: 100000

Units: persons

FLOWS

maturity= young people/Period of maturity

Units: persons/year

deaths of adults= adults*Adult mortality rate

Units: persons/year

deaths of young people= young people*Young people mortality rate

Units: persons/year

natural deaths=elderly people/Final period

Units: persons/year

births= adults*Birth rate

Units: persons/year

old age=adults/Period of aging

Units: persons/year

Juan Martín García – Theory and Practical Exercises of System Dynamics 196

AUXILIARY VARIABLES

Period of maturity= 20

Units: year

Number of years it takes young people to become adults

Period of aging= 50

Units: year

Number of years it takes adults to become elderly people

Final period=10

Units: year

Number of years in the life of elderly people

Adult mortality rate= 0.02

Units: 1/year

Young people mortality rate= 0.025

Units: 1/year

Percentage of young people that die before becoming adults

Birth rate=0.06

Units: 1/year

Total population= adults+young people+elderly people

Units: persons

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