Dynamics - Systems models
6 important questions on Dynamics - Systems models
What is stock (state variable, container, reservoir)?
- initial value
- is updated every time step
- the amout in the stock can influence flows of material in or out of the stock
What is flow (rate variable/flux)?
- is updated every time step
- values can be influenced by amount in the stocks or by auxiliary variables
For example:
- loss of timber due to exploitation
- carbon sequestration
What is the converter (constants/auxiliary variable)?
- connected to flows or other constants using information arrows
- no do contain material
- may change over time: stochastically or deterministically
Examples:
- pro capita mortality rate of a population
- forest regrowth after disturbance
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What is the action connector (information arrow)?
- not to stock
What does the time step depend on?
- Input data: per day, month, year?
- Needed output: quick or slow responses?
- small time steps are more acccurale
- we use DT=1, but check this!
What are the differences between matrix models and systems models?
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
