modelArable_Land_Dynamics
Arable land dynamics
Information
This model quantifies the land that is being used to produce food, i.e., the arable land. The model contains three state variables, representing the potential arable land, i.e., land that could be developed to grow crop, but so far hasn't been developed; the arable land that is currently being used for agriculture; and finally, the land that is being used for urban development and industry (including mining). Some of the potential arable land is getting developed over time, whereas some of the arable land is being lost either to urban development or to erosion.The arable land is measured in units of hectares.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | arable_land_init | 0.9e9 | Initial arable land |
| Real | avg_life_land_norm | 1000 | Normal life span of land |
| Real | inherent_land_fert | 600 | Inherent land fertility |
| Real | pot_arable_land_init | 2.3e9 | Initial potential arable land |
| Real | pot_arable_land_tot | 3.2e9 | Total potential arable land |
| Real | social_discount | 0.07 | Social discount |
| Real | t_land_life_time | 4000 | Land life time |
| Real | urban_ind_land_init | 8.2e6 | Initial urban and industrial land |
| Real | urb_ind_land_dev_time | 10 | Urban and industrial land development time |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | land_yield | Land yield | |
| Modelica.Blocks.Interfaces.RealInput | marg_prod_agr_inp | Development of marginally producing land | |
| Modelica.Blocks.Interfaces.RealInput | population | Population | |
| Modelica.Blocks.Interfaces.RealInput | ind_out_pc | Per capita annual industrial output | |
| Modelica.Blocks.Interfaces.RealInput | tot_agric_invest | Total investment in the agricultural sector | |
| Modelica.Blocks.Interfaces.RealOutput | arable_land | Arable land | |
| Modelica.Blocks.Interfaces.RealOutput | urban_ind_land | Land occupied by human dwellings and industry | |
| Modelica.Blocks.Interfaces.RealOutput | fr_inp_al_land_dev | Fraction of capital invested in agriculture allocated to the devlopment of arable land |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Rates.RRate | Land_Devel_Rt | p.289 of Dynamics of Growth in a Finite World | |
| Levels.Level2b | Arable_Land | p.279 of Dynamics of Growth in a Finite World | |
| Rates.RRate | Land_Rem_Urb_Ind_Use | p.322 of Dynamics of Growth in a Finite World | |
| Rates.RRate | Land_Erosion_Rt | p.318 of Dynamics of Growth in a Finite World | |
| Sources.Sink | sink | ||
| Levels.Level1b | Pot_Arable_Land | p.279 of Dynamics of Growth in a Finite World | |
| Levels.Level1a | Urban_Ind_Land | p.322 of Dynamics of Growth in a Finite World | |
| Utilities.Land_Devel_Rt | Land_Dev_Rt | p.289 of Dynamics of Growth in a Finite World | |
| Utilities.Land_Rem_Urb_Ind_Use | Land_Rem_UI_Use | p.322 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Division | Land_Er_Rt | p.318 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Gain | Avg_Life_Land | p.316 of Dynamics of Growth in a Finite World | |
| Functions.Tabular | Dev_Cost_Per_Hect | p.291 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Gain | Gain1 | p.291 of Dynamics of Growth in a Finite World | |
| Utilities.Marg_Prod_Land_Dev | Marg_Prod_Land_Dev | p.312 of Dynamics of Growth in a Finite World | |
| Functions.Tabular | Fr_Inp_Al_Land_Dev | p.311 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Division | Div1 | p.311 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Gain | Land_Fr_Cult | p.278 of Dynamics of Growth in a Finite World | |
| Auxiliary.Prod_2 | Urb_Ind_Land_Req | p.321 of Dynamics of Growth in a Finite World | |
| Functions.Tabular | Urb_Ind_Land_PC | p.321 of Dynamics of Growth in a Finite World | |
| Utilities.S_Land_Life_Mlt_Yield | S_Land_Life_Mlt_Yield | p.317 of Dynamics of Growth in a Finite World | |
| Functions.Tabular | P_Land_Life_Mlt_Yield_1 | p.317 of Dynamics of Growth in a Finite World | |
| Functions.Tabular | P_Land_Life_Mlt_Yield_2 | p.318 of Dynamics of Growth in a Finite World | |
| Modelica.Blocks.Math.Gain | Gain2 | p.317 of Dynamics of Growth in a Finite World |