This model explains the primary production of phytoplankton, forced by light and nutrients over a year period.
Primary Production Phytoplankton Environment
This model explains the primary production of phytoplankton, forced by light and nutrients over a year period.


Primary Producton Model with Phytoplankton as State Variable
Afonso Pinto
From Jay Forrester 1971 Book  World Dynamics , the earlier, simpler version of the  World 3   Limits to Growth  Model. adapted from Mark Heffernan's ithink version at  Systemswiki . An element of Perspectives: The Foundation of Understanding and Insights for Effective Action. Register at  http://w
Perspectives Limits To Growth Environment

From Jay Forrester 1971 Book World Dynamics, the earlier, simpler version of the World 3 Limits to Growth Model. adapted from Mark Heffernan's ithink version at Systemswiki.

An element of Perspectives: The Foundation of Understanding and Insights for Effective Action. Register at http://www.systemswiki.org/

Model of World Dynamics
Robert Scott
32 7 months ago
Examining the population growth of a species and how reproductive technology influences its population as an endangered species.
Ecosystems Environment Endangered Animals
Examining the population growth of a species and how reproductive technology influences its population as an endangered species.
Clone of Sea Turtles
William Holt
M.Sc. in Environmental Engineering SIMA 2018 New University of Lisbon, Portugal  Model to represent oyster individual growth by simulating feeding and metabolism. Model (i) partitions metabolic costs into feeding and fasting catabolism; (ii) adds allometry to clearance rate; (iii) adds temperature
Environment Aquaculture
M.Sc. in Environmental Engineering SIMA 2018
New University of Lisbon, Portugal

 Model to represent oyster individual growth by simulating feeding and metabolism. Model (i) partitions metabolic costs into feeding and fasting catabolism; (ii) adds allometry to clearance rate; (iii) adds temperature dependence to clearance rate; (iv) illustrates how coupled model requires a substantial volume of water (a single oyster typically clears 20-30 m3 of water in one growth cycle)
Clone of SIMA 2018 coupled primary production and oysters
Marta Carrega
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards . Air Pollution is causing 4,000 premature deaths per year , including health costs over US$8 billion. The System Dynamics Causal Loop Diagram developed herein shows an initial study o
Air Pollution Environment Heating
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards. Air Pollution is causing 4,000 premature deaths per year, including health costs over US$8 billion.

The System Dynamics Causal Loop Diagram developed herein shows an initial study of the dynamics among the variables that influences the accumulation of PM in the air, in particular the case of Temuco, in the South of Chile. In Temuco, 97% of the PM inventories comes from the combustion of low quality firewood, which in turns is being burned due to its low price and cultural habits/tradition.
Clone of Air Pollution Dynamics - Firewood Combustion
Valentin Keller
Interactions between wolves and livestock depending on abundance
Ecology Environment Agriculture
Interactions between wolves and livestock depending on abundance
Wolves and Cattle
Chris Gutierrez
4
This is step 2 in making a climate model based on our insights of how trees actively contribute to the cooling capcacity of the Earth.​ In this step we divide the incoming energy from the sun to the land and to the oceaan. With Our-Green-Spine we have discovered new insights how trees / fore
Environment Climate Water Forest Cooling Greenhouse GHG
This is step 2 in making a climate model based on our insights of how trees actively contribute to the cooling capcacity of the Earth.​

In this step we divide the incoming energy from the sun to the land and to the oceaan.


With Our-Green-Spine we have discovered new insights how trees / forest / green structures are part of the managing system of controlling the temperature of our Earth via their cooling capacity by using water and influencing the water cycle. We want to translate our insights in a climate model. People who to join us please send an email to marcel.planb@gmail.com.
Thanks, Marcel de Berg
Model 2 Distributing in coming Sun over land and ocean
Marcel de Berg
6
Insight diagram
Environment Sustainability Microplastic Health Marine
Clone of Clone of Group 1 Project
Cassidy Mellott
Integrated Climate Model
Environment Climate Weather
Integrated Climate Model
Integrated Climate Model
Guy Lakeman
This model describes nitrogen cycling in a dune-lake system in the Northland region of New Zealand. It is based on stock and flow diagrams where each orange oval represents an input, while each blue box represents a stock. Each arrow represents a flow. Flows reduce the stock at which they start and
Management Leaching Environment Lake Nutrient Cycling

This model describes nitrogen cycling in a dune-lake system in the Northland region of New Zealand. It is based on stock and flow diagrams where each orange oval represents an input, while each blue box represents a stock. Each arrow represents a flow. Flows reduce the stock at which they start and add to the stock at which they end.

Clone of Story of nitrogen dynamics in a shallow lake
Caleb Jacob Coffey
Our final beer game!
Beer Game Environment
Our final beer game!
Clone of Beer Game Verweij, Lufen, Rmk, Cerniauskaite
team123
Simple mass balance model for lakes, based on the Vollenweider equation: dMw/dt = Min - sMw - Mout The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
Lakes And Reservoirs Environment Eutrophication
Simple mass balance model for lakes, based on the Vollenweider equation:

dMw/dt = Min - sMw - Mout

The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.
Clone of Vollenweider model
Monique Beyer
This model describes the flow of energy from generation to consumption for neighborhoods in the metro Atlanta area. It also calculates the cost of energy production and the number of years it will take to recover that cost.
Micro Grid Smart Grid Environment Solar
This model describes the flow of energy from generation to consumption for neighborhoods in the metro Atlanta area. It also calculates the cost of energy production and the number of years it will take to recover that cost.
Clone of Microgrid with storage
Jeb Eddy
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards . Air Pollution is causing 4,000 premature deaths per year , including health costs over US$8 billion. The System Dynamics Causal Loop Diagram developed herein shows an initial study o
Air Pollution Environment Heating
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards. Air Pollution is causing 4,000 premature deaths per year, including health costs over US$8 billion.

The System Dynamics Causal Loop Diagram developed herein shows an initial study of the dynamics among the variables that influences the accumulation of PM in the air, in particular the case of Temuco, in the South of Chile. In Temuco, 97% of the PM inventories comes from the combustion of low quality firewood, which in turns is being burned due to its low price and cultural habits/tradition.
Clone of Air Pollution Dynamics - Firewood Combustion
QUT
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards . Air Pollution is causing 4,000 premature deaths per year , including health costs over US$8 billion. The System Dynamics Causal Loop Diagram developed herein shows an initial study o
Heating Environment Air Pollution
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards. Air Pollution is causing 4,000 premature deaths per year, including health costs over US$8 billion.

The System Dynamics Causal Loop Diagram developed herein shows an initial study of the dynamics among the variables that influences the accumulation of PM in the air, in particular the case of Temuco, in the South of Chile. In Temuco, 97% of the PM inventories comes from the combustion of low quality firewood, which in turns is being burned due to its low price and cultural habits/tradition.
Clone of Air Pollution Dynamics - Firewood Combustion
Christina Cheung
Based on Paul Martin's YouTube Video Systems mapping vs2
Health Care Resilience Governance Environment

Based on Paul Martin's YouTube Video Systems mapping vs2

Landscape Governance
Geoff McDonnell
for more information, contact Dr. Ann Stapleton at: stapletona@uncw.edu Description: A simple model for breeding plants from generation to generation, with one "yield" variable (e.g. height) and 4 combinations of plants from the parents. Simulation tracks the frequencies of each combination
Plants Environment Breeding Biology
for more information, contact Dr. Ann Stapleton at: stapletona@uncw.edu

Description:

A simple model for breeding plants from generation to generation, with one "yield" variable (e.g. height) and 4 combinations of plants from the parents. Simulation tracks the frequencies of each combination in each generation as well as the overall average height by generation.

Adjust all sliders before beginning simulation. Make sure the A1A2 parameters are equal to the A2A1 parameters.
Clone of Plant Breeding Simulation
Jeb Eddy
My AP Environmental Homework for the Cats Over Borneo Assignment
Environment Food Chain
My AP Environmental Homework for the Cats Over Borneo Assignment
Taiga Food Web
Robbie Marshall
3
Bathtub SFD
Environment Bathtub

Bathtub SFD

Clone of MLP Bathtub Insight with outflow depending on water level
Edward T Konz
Insight diagram
Environment Brown APES
Food Web APES
Gabriel Wies
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards . Air Pollution is causing 4,000 premature deaths per year , including health costs over US$8 billion. The System Dynamics Causal Loop Diagram developed herein shows an initial study o
Air Pollution Heating Environment
In Chile, 60% of its population are exposed to levels of Particulate Matter (PM) above international standards. Air Pollution is causing 4,000 premature deaths per year, including health costs over US$8 billion.

The System Dynamics Causal Loop Diagram developed herein shows an initial study of the dynamics among the variables that influences the accumulation of PM in the air, in particular the case of Temuco, in the South of Chile. In Temuco, 97% of the PM inventories comes from the combustion of low quality firewood, which in turns is being burned due to its low price and cultural habits/tradition.
Clone of Air Pollution Dynamics - Firewood Combustion
Andrew Kidd
Examining the ecosystem of the sea turtle and how that influences its population as an endangered species.
Endangered Animals Ecosystems Environment
Examining the ecosystem of the sea turtle and how that influences its population as an endangered species.
Clone of Sea Turtles
Simon
STEM-SM combines a simple ecosystem model (modified version of VSEM; Hartig et al. 2019) with a soil moisture model (Guswa et al. (2002) leaky bucket model). Outputs from the soil moisture model influence ecosystem dynamics in three ways.  (1) The ratio of actual transpiration to maximum evapotran
GEG5224 Ecosystem Ecology Environment Carbon Productivity Decomposition Evapotranspiration Water Soil moisture
STEM-SM combines a simple ecosystem model (modified version of VSEM; Hartig et al. 2019) with a soil moisture model (Guswa et al. (2002) leaky bucket model). Outputs from the soil moisture model influence ecosystem dynamics in three ways. 
(1) The ratio of actual transpiration to maximum evapotranspiration (T/ETmax) modifies gross primary productivity (GPP).
(2) Degree of saturation of the soil (Sd) modifies the rate of soil heterotrophic respiration.
(3) Water limitation of GPP (by T/ETmax) and of soil nutrient availability (approximated by Sd) combine with leaf area limitation (approximated by fraction of incident photosynthetically-active radiation that is absorbed) to modify the allocation of net primary productivity to aboveground and belowground parts of the vegetation.

Ecosystem dynamics in turn influence flows of water in to and out of the soil moisture stock. The size of the aboveground biomass stock determines fractional vegetation cover, which modifies interception, soil evaporation and transpiration by plants.

References:
Guswa, A.J., Celia, M.A., Rodriguez-Iturbe, I. (2002) Models of soil moisture dynamics in ecohydrology: a comparative study. Water Resources Research 38, 5-1 - 5-15.

Hartig, F., Minunno, F., and Paul, S. (2019). BayesianTools: General-Purpose MCMC and SMC Samplers and Tools for Bayesian Statistics. R package version 0.1.7. https://CRAN.R-project.org/package=BayesianTools

Clone of Simple Terrestrial Ecosystem Model - Soil Moisture (STEM-SM)
Liv K
This is to support a discussion on money flows and growth. Money as a lubricant for the flow of embodied energy in human systems. See also A Prosperous Way Down website
Environment Economics Money
This is to support a discussion on money flows and growth. Money as a lubricant for the flow of embodied energy in human systems.
See also A Prosperous Way Down website
Clone of Odum Money and Energy Flows
Pagandai V Pannir Selvam