blockArable_Land_Dynamics

Arable land dynamics
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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

TypeNameDefaultDescription
Realarable_land_init900000000.0Initial arable land
Realavg_life_land_norm1000Normal life span of land
Realinherent_land_fert600Inherent land fertility
Realpot_arable_land_init2300000000.0Initial potential arable land
Realpot_arable_land_tot3200000000.0Total potential arable land
Realsocial_discount0.07Social discount
Realt_land_life_time4000Land life time
Realurban_ind_land_init8200000.0Initial urban and industrial land
Realurb_ind_land_dev_time10Urban and industrial land development time

Connectors

TypeNameDefaultDescription
SystemDynamics.Interfaces.MassInPortland_yieldLand yield
SystemDynamics.Interfaces.MassInPortmarg_prod_agr_inpDevelopment of marginally producing land
SystemDynamics.Interfaces.MassInPortpopulationPopulation
SystemDynamics.Interfaces.MassInPortind_out_pcPer capita annual industrial output
SystemDynamics.Interfaces.MassInPorttot_agric_investTotal investment in the agricultural sector
SystemDynamics.Interfaces.MassOutPortarable_landArable land
SystemDynamics.Interfaces.MassOutPorturban_ind_landLand occupied by human dwellings and industry
SystemDynamics.Interfaces.MassOutPortfr_inp_al_land_devFraction of capital invested in agriculture allocated to the devlopment of arable land

Components

TypeNameDefaultDescription
SystemDynamics.Rates.RRateLand_Devel_Rtp.289 of Dynamics of Growth in a Finite World
SystemDynamics.Levels.Level2bArable_Landp.279 of Dynamics of Growth in a Finite World
SystemDynamics.Rates.RRateLand_Rem_Urb_Ind_Usep.322 of Dynamics of Growth in a Finite World
SystemDynamics.Rates.RRateLand_Erosion_Rtp.318 of Dynamics of Growth in a Finite World
SystemDynamics.Sources.Sinksink
SystemDynamics.Levels.Level1bPot_Arable_Landp.279 of Dynamics of Growth in a Finite World
SystemDynamics.Levels.Level1aUrban_Ind_Landp.322 of Dynamics of Growth in a Finite World
SystemDynamics.WorldDynamics.World3.Utilities.Land_Devel_RtLand_Dev_Rtp.289 of Dynamics of Growth in a Finite World
SystemDynamics.WorldDynamics.World3.Utilities.Land_Rem_Urb_Ind_UseLand_Rem_UI_Usep.322 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.DivisionLand_Er_Rtp.318 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.GainAvg_Life_Landp.316 of Dynamics of Growth in a Finite World
SystemDynamics.Functions.TabularDev_Cost_Per_Hectp.291 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.GainGain1p.291 of Dynamics of Growth in a Finite World
SystemDynamics.WorldDynamics.World3.Utilities.Marg_Prod_Land_DevMarg_Prod_Land_Devp.312 of Dynamics of Growth in a Finite World
SystemDynamics.Functions.TabularFr_Inp_Al_Land_Devp.311 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.DivisionDiv1p.311 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.GainLand_Fr_Cultp.278 of Dynamics of Growth in a Finite World
SystemDynamics.Auxiliary.Prod_2Urb_Ind_Land_Reqp.321 of Dynamics of Growth in a Finite World
SystemDynamics.Functions.TabularUrb_Ind_Land_PCp.321 of Dynamics of Growth in a Finite World
SystemDynamics.WorldDynamics.World3.Utilities.S_Land_Life_Mlt_YieldS_Land_Life_Mlt_Yieldp.317 of Dynamics of Growth in a Finite World
SystemDynamics.Functions.TabularP_Land_Life_Mlt_Yield_1p.317 of Dynamics of Growth in a Finite World
SystemDynamics.Functions.TabularP_Land_Life_Mlt_Yield_2p.318 of Dynamics of Growth in a Finite World
Modelica.Blocks.Math.GainGain2p.317 of Dynamics of Growth in a Finite World