Water - GCAM: Difference between revisions
Jump to navigation
Jump to search
Note: The documentation of GCAM is 'under review' and is not yet 'published'!
No edit summary |
No edit summary |
||
| Line 8: | Line 8: | ||
== Demand for Water == | == Demand for Water == | ||
Water demand is calculated for six major sectors: agriculture, electricity generation, industrial manufacturing, primary energy production, livestock, and municipal uses. For each sector, up to four types of water demand are represented. Types of water include | Water demand is calculated for six major sectors: agriculture, electricity generation, industrial manufacturing, primary energy production, livestock, and municipal uses. For each sector, up to four types of water demand are represented. Types of water include | ||
* water withdrawals: water diverted or withdrawn from a surface water or groundwater source (Vickers 2001). | * water withdrawals: water diverted or withdrawn from a surface water or groundwater source ([https://jgcri.github.io/gcam-doc/demand_water.html#vickers2001 Vickers 2001]). | ||
* water consumption: water use that permanently withdraws water from its source; water that is no longer available because it has evaporated, been transpired by plants, incorporated into products or crops, consumed by people or livestock, or otherwise removed from the immediate water environment (Vickers 2001). | * water consumption: water use that permanently withdraws water from its source; water that is no longer available because it has evaporated, been transpired by plants, incorporated into products or crops, consumed by people or livestock, or otherwise removed from the immediate water environment ([https://jgcri.github.io/gcam-doc/demand_water.html#vickers2001 Vickers 2001]). | ||
* biophysical water consumption: total water required for crop evapo-transpiration; the sum of “blue” and “green” water in Mekonnen and Hoekstra 2011 | * biophysical water consumption: total water required for crop evapo-transpiration; the sum of “blue” and “green” water in [https://jgcri.github.io/gcam-doc/demand_water.html#mekonnen2011 Mekonnen and Hoekstra 2011] | ||
* seawater: water from the oceans, including brackish estuaries, that is withdrawn for cooling thermo-electric power plants, or used in primary energy production. | * seawater: water from the oceans, including brackish estuaries, that is withdrawn for cooling thermo-electric power plants, or used in primary energy production. | ||
Revision as of 18:45, 17 June 2022
Note: The documentation of GCAM is 'under review' and is not yet 'published'!| Corresponding documentation | |
|---|---|
| Previous versions | |
| No previous version available | |
| Model information | |
| Model link | |
| Institution | Pacific Northwest National Laboratory, Joint Global Change Research Institute (PNNL, JGCRI), USA, https://www.pnnl.gov/projects/jgcri. |
| Solution concept | General equilibrium (closed economy)GCAM solves all energy, water, and land markets simultaneously |
| Solution method | Recursive dynamic solution method |
| Anticipation | GCAM is a dynamic recursive model, meaning that decision-makers do not know the future when making a decision today. After it solves each period, the model then uses the resulting state of the world, including the consequences of decisions made in that period - such as resource depletion, capital stock retirements and installations, and changes to the landscape - and then moves to the next time step and performs the same exercise. For long-lived investments, decision-makers may account for future profit streams, but those estimates would be based on current prices. For some parts of the model, economic agents use prior experience to form expectations based on multi-period experiences. |
Supply of Water
Three distinct sources of fresh water are modeled, renewable water (surface and ground), non-renewable groundwater, and desalinated water. Renewable water is water that is replenished naturally by surface runoff and subsurface infiltration and release. Non-renewable groundwater is fossil groundwater resources or groundwater where abstraction exceeds recharge. Renewable water and non-renewable groundwater are separately modeled for each basin. Desalinated water is available as an additional source of freshwater within each basin and for alternative end-use demands for water. See Supply of Water for a full description.
Demand for Water
Water demand is calculated for six major sectors: agriculture, electricity generation, industrial manufacturing, primary energy production, livestock, and municipal uses. For each sector, up to four types of water demand are represented. Types of water include
- water withdrawals: water diverted or withdrawn from a surface water or groundwater source (Vickers 2001).
- water consumption: water use that permanently withdraws water from its source; water that is no longer available because it has evaporated, been transpired by plants, incorporated into products or crops, consumed by people or livestock, or otherwise removed from the immediate water environment (Vickers 2001).
- biophysical water consumption: total water required for crop evapo-transpiration; the sum of “blue” and “green” water in Mekonnen and Hoekstra 2011
- seawater: water from the oceans, including brackish estuaries, that is withdrawn for cooling thermo-electric power plants, or used in primary energy production.
For more information, see Demand for Water.
Water Module Details
For more information on water in GCAM including on basin-to-region and basin-to-sector mappings and water markets, visit the detailed water page.