System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
Exercise 6 simulates a whale poplutation with a minimum reproductive capacity
Clone of System Zoo Z109 ex 6: Whale population
Replicate a Z501 Supply chain model in InsightMaker, Replication 1 from Bossel, System Zoo 3.
Variables are indicated in Italics, small capitals are used dor parameters, state variables shown as boxs, united os measurement are shown in [square bracket].
XN 18 - Z501 Supply chain
System Zoo Z412 Tourism Dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Clone of REM 221 - Z412 Tourism Dynamics
System Zoo Z102: System state and state change from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z102: System state and state change
Adapted from Hartmut Bossel's "System Zoo 3 Simulation Models, Economy, Society, Development."
Population model where the population is summarized in four age groups (children, parents, older people, old people). Used as a base population model for dealing with issues such as employment, care for the elderly, pensions dynamics, etc.
Clone of Z602 Population with four age groups
System Zoo Z103: Exponential growth and decay from System Zoo 1 by Hartmut Bossel
Bossel: Z103 Exponential growth and decay
System Zoo Z106b: Simple population dynamics from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z106b: Simple population dynamics
System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
Exercise 6 simulates a whale poplutation with a minimum reproductive capacity
Clone of System Zoo Z109 ex 6: Whale population
Insight Maker model based on the Z415 System Zoo model originally developed in Vensim.
Clone of System Zoo Z415 Resource Extraction and Recycling
Bossel: Z301 Regional Water Balance
System Zoo Z101: Single integration from System Zoo 1 by Hartmut Bossel
AA_Zoo Z101: SIN_input
System Zoo Z106: Simple population dynamics from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z106: Simple population dynamics
System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
Bossel: Z109 Logistic growth with constant harvest
Fisheries model from Hartmut Bossel "System Zoo 3 Simulation Models: Climate Ecosystems, Resources"
Clone of System Zoo 409
Insight Maker model based on the Z415 System Zoo model originally developed in Vensim.
Clone of System Zoo Z415 Resource Extraction and Recycling
Adapted from:
System Zoo Z409 Fishery dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Fisheries represent an interaction between ecological and economic systems. All else being equal, fish populations can sustain fishing indefinitely if extraction rates are below renewal rates, but above this, catch starts to fall with increasing fishing effort. Economic pressure makes it difficult to stay below those limits.
It is necessary for fishers to meet their costs to keep fishing over time, so a minimum profit must be met; as more people join the fishery, there is less available for each person fishing. Unmanaged fisheries are often over-exploited so that catch is much lower than it could be. Proper management often means putting limits on people - limiting the number of boats or number of fish that can be caught.
REM 221 - Z409 Fishery dynamics (adapted)
System Zoo Z105: Time-dependent growth from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z105: Time-dependent growth
System Zoo Z409 Fishery dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Fishing is a classic example for use of a renewable resource. Unless overfished, fish populations If is hardly by fishing, then the fish population will persist at a constant size corresponding to its specific ecological envi ronment If the stock is overfished, the juvenile generation becomes too small to fully replace the adult generation. If overfishing continues. the population cannot recover and will collapse in short time. Even if fish catch stops now/, it could take decades until the fish population recovers to its original size if it hasn't become extinct meanwhile. In many of the world overtlshing has led, and still leads, to the complete collapse of formerly huge tlsh populations: herring in the North Sea, codtlsh in the Northern Atlantic. tuna, whales to name only a few. With the collapse of fish stocks came the collapse of the t1shing industry in many regions. Employment and
incomes disappeared: whole regions (like Newfoundland) lost their economic base.
Bossel: Z409 Fishery dynamics
System Zoo Z104: Exponential delay from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z104: Exponential delay
Acest model este adaptat după reprezentarea lui Harmut Bossel, în lucrarea "System Zoo 3 Simulation Models, Economy, Society, Development."
Utilizarea modelului ne poate ajuta pentru a vizualiza evolutia populatiei pe grupe de varsta sau pentru a gestiona probleme cum ar fi ocuparea forței de muncă.
Clone of Z602 Population with four age groups
System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
Exercise 6 simulates a whale poplutation with a minimum reproductive capacity
Clone of System Zoo Z109 ex 6: Whale population
System Zoo Z302 - Global carbon circulation from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
By photosynthesis and decomposition of organic matter (stand litter and humus) and by respiration of plants and animals large amounts of carbon dioxide are constantly being removed from and returned to the atmosphere. These gigantic C02 flowswere in equilibrium over millions of years. Annual C02 gains and losses of the atmosphere balanced rather exactly, so that the atmospheric C02 level hardly changed. Since the beginning of industrialization this dynamic equilibrium between the reservoirs of atmosphere and (living and dead) biomass has been disturbed by the burningof fossil fuels and the deforestation of large areas. Every year more C02 now reaches the atmosphere than is taken out by photosynthesis. This leads to an increasing fraction of the greenhouse gas C02 in the atmosphere a major cause of gradual temperature increase and of climate change.
Bossel: Z302 - Global carbon circulation
Stage 2 Model - Population
