Water: Difference between revisions
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m (Text replace - "Crop and grassland model" to "Crop and grass") |
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|FrameworkElementType=state component | |FrameworkElementType=state component | ||
|Status=On hold | |Status=On hold | ||
|IMAGEComponent=Agriculture and land use; C cycle and natural vegetation dynamics; Crop and | |IMAGEComponent=Agriculture and land use; C cycle and natural vegetation dynamics; Crop and grass; Forest management; Human development; Energy supply and demand; | ||
|ExternalModel= | |ExternalModel= | ||
|KeyReference=Rost et al., 2008; Gerten et al., 2004; Biemans et al., 2011; Biemans, 2012; | |KeyReference=Rost et al., 2008; Gerten et al., 2004; Biemans et al., 2011; Biemans, 2012; | ||
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==Links to other parts of the model, input and output== | ==Links to other parts of the model, input and output== | ||
The hydrological model of IMAGE is closely linked to the model on natural vegetation, crop and carbon cycles (see [[C cycle and natural vegetation dynamics]]; [[Crop and | The hydrological model of IMAGE is closely linked to the model on natural vegetation, crop and carbon cycles (see [[C cycle and natural vegetation dynamics]]; [[Crop and grass]]), because all those submodels are represented in LPJmL, which is a global hydrology and vegetation model ([[Sitch et al., 2003]]; [[Bondeau et al., 2007]]). | ||
An overview of data exchanges with other IMAGE modules is given below. Data on annual land cover and land use are used as input into LPJmL, including information on the location of irrigated areas and types of crops. This influences the amounts of water that evaporate and run off, as well as the amount of water needed for those irrigated areas. Vice versa, information on water availability as calculated by LPJmL is taken into account by the land allocation model to find suitable locations for the expansion of irrigated areas. Climate is used as an input into LPJmL to determine reference evapotranspiration, and the precipitation input to the water balance ([[Gerten et al., 2004]]). The crop model, which is also part of LPJmL ([[Crop and | An overview of data exchanges with other IMAGE modules is given below. Data on annual land cover and land use are used as input into LPJmL, including information on the location of irrigated areas and types of crops. This influences the amounts of water that evaporate and run off, as well as the amount of water needed for those irrigated areas. Vice versa, information on water availability as calculated by LPJmL is taken into account by the land allocation model to find suitable locations for the expansion of irrigated areas. Climate is used as an input into LPJmL to determine reference evapotranspiration, and the precipitation input to the water balance ([[Gerten et al., 2004]]). The crop model, which is also part of LPJmL ([[Crop and grass]]), calculates irrigation water demand based on crop characteristics, soil moisture and climate. If the amount of water available for irrigation is limited, the crop model calculates the reduction in crop yield due to water stress. | ||
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Revision as of 17:21, 11 December 2013
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Key policy issues
- What is the combined effect of climate change and socio-economic development on water demand and availability, and on associated agricultural production?
- What is the potential of adaptation measures to reduce water stress and water-related crop production losses?
- How can water demand be reduced and still provide the adequate service levels to the sectors with the highest demand?