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System modelling with STELLA: An introduction

A general overview of how and why you might model with STELLA.

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STELLA: An Introduction
Example:
Mass Balance of Ceramic Filters in Uganda
Kyle Monahan | Tufts University
1-23-2016
STELLA – Overview
TELI-G | Tufts University | Spring 2016
• Visually based system modeling software
• Social sciences (psych, anthro); Policy (GHG, energy); Envi Sci
(ecology, geochem)
• General form:
• Especially good for:
• Dynamic systems
• Social & Science
Deforestation Models w/ Social
ENVR | E-147 | International Environmental Governance
Climate Models
ENVR | E-147 | International Environmental Governance
Lake Models
ENVR | E-147 | International Environmental Governance
STELLA – Overview
TELI-G | Tufts University | 1-17-2015
• Visually based system modeling software
• Social sciences (psych, anthro); Policy (GHG, energy); Envi Sci
(ecology, geochem)
• General form:
• Especially good for:
• Dynamic systems
• Social & Science
TELI-G | Tufts University | Spring 2016

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System modelling with STELLA: An introduction

  • 1. STELLA: An Introduction Example: Mass Balance of Ceramic Filters in Uganda Kyle Monahan | Tufts University 1-23-2016
  • 2. STELLA – Overview TELI-G | Tufts University | Spring 2016 • Visually based system modeling software • Social sciences (psych, anthro); Policy (GHG, energy); Envi Sci (ecology, geochem) • General form: • Especially good for: • Dynamic systems • Social & Science
  • 3. Deforestation Models w/ Social ENVR | E-147 | International Environmental Governance
  • 4. Climate Models ENVR | E-147 | International Environmental Governance
  • 5. Lake Models ENVR | E-147 | International Environmental Governance
  • 6. STELLA – Overview TELI-G | Tufts University | 1-17-2015 • Visually based system modeling software • Social sciences (psych, anthro); Policy (GHG, energy); Envi Sci (ecology, geochem) • General form: • Especially good for: • Dynamic systems • Social & Science TELI-G | Tufts University | Spring 2016
  • 7. STELLA – Overview TELI-G | Tufts University | 1-17-2015 Stocks flows connectors Links Sector frames Graph table Erase Copy View the math behind the model Edit the values in stocks and flows Visualize the system in this tab (start here) Interact with the simulation – add buttons, etc TELI-G | Tufts University | Spring 2016
  • 8. STELLA – Overview TELI-G | Tufts University | 1-17-2015 • Many systems can be modeled: TELI-G | Tufts University | Spring 2016 • We can increase a stock by: • Decreasing the outflow • Use less oil • Increasing the inflow • Find more oil (Meadows, 2008) Remember – look at the dynamic of the system as a whole – the function of the system is key!
  • 9. STELLA – How to start TELI-G | Tufts University | 1-17-2015 • Define system boundaries • Remember – list your components (e.g. Antje) • List the assumptions • As you connect components • Causal diagram; feedbacks • Adapt your model iteratively TELI-G | Tufts University | Spring 2016
  • 10. STELLA – Example TELI-G | Tufts University | 1-17-2015TELI-G | Tufts University | Spring 2016
  • 11. STELLA – Goals for Today TELI-G | Tufts University | 1-17-2015 • Today, we’re making a mass flow (m3) diagram for ceramic filters (an example) • General thoughts: System boundaries? Functional unit? Flows and stocks? End output? Life cycle/time boundaries? • You can apply these to your own work as well! TELI-G | Tufts University | Spring 2016
  • 12. STELLA – Goals for Today TELI-G | Tufts University | 1-17-2015 • We’ll go through a simple system and see the outputs given • While I do this – think about how you could apply this to your work • Feel free to ask questions, now and during the practice period TELI-G | Tufts University | Spring 2016
  • 13. STELLA – Resources TELI-G | Tufts University | 1-17-2015 • iSee systems Tutorials – great for specifics on what buttons do: http://www.iseesystems.com/community/downloads/tutorials/ModelB uilding.aspx • Carleton College - good for general model ideas: http://serc.carleton.edu/introgeo/mathstatmodels/StellaHow.html • Getting Started With STELLA (ThoughtMap) - good high level overview: http://www.thoughtmap.com/storage/files/Getting%20Started%20with%20iThink %20and%20STELLA.pdf TELI-G | Tufts University | Spring 2016
  • 14. STELLA – Resources TELI-G | Tufts University | 1-17-2015 • Also will email out all of the STELLA files I’ve used – from chemical equilibrium of phosphorus in lakes to population growth dynamics • You can use these as examples • Also .stm files are sometimes added to papers (see citations) TELI-G | Tufts University | Spring 2016
  • 15. STELLA TELI-G | Tufts University | 1-17-2015 Let’s make a model! TELI-G | Tufts University | Spring 2016

Editor's Notes

  1. Image source: http://www.movetobostonmass.com/images/town1.jpg
  2. http://www.visualnews.com/2013/05/10/7-shocking-google-earth-gifs-of-human-impact-on-earth/ Paper: Costanza, Robert, and Sara Gottlieb. "Modelling ecological and economic systems with STELLA: Part II." Ecological Modelling 112.2 (1998): 81-84.
  3. http://www.visualnews.com/2013/05/10/7-shocking-google-earth-gifs-of-human-impact-on-earth/ Zhang, Jiarui, et al. "A model for the contribution of macrophyte-derived organic carbon in harvested tidal freshwater marshes to surrounding estuarine and oceanic ecosystems and its response to global warming." Ecological Modelling294 (2014): 105-116.
  4. http://www.visualnews.com/2013/05/10/7-shocking-google-earth-gifs-of-human-impact-on-earth/ Pollman, Curtis D., and R. Thomas James. "A simple model of internal loading of phosphorus in Lake Okeechobee." Lake and Reservoir Management 27.1 (2011): 15-27.
  5. Source: http://www.sarracenia.com/astronomy/remotesensing/primer0120.html