U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Modeling Water Availability for Irrigation in the US
Published: August 30, 2017
Posted: January 19, 2018

Water available for irrigation will be affected by environmental change as well as increasing demand from other sectors, with consequences for the interaction of complex energy-water-land systems. 

The Science
Environmental change is likely to affect global food production, with some regions under heightened risk to droughts, flooding and other disruption. One powerful countermeasure is irrigation: globally, production on a hectare of irrigated land is 2.7 times that on dry land. The future of irrigation, however, depends on the continued availability of significant volumes of fresh water. Food production now accounts for 70% of global freshwater use, and many areas are already water stressed. Environmental change, together with increased demand from other sectors, could exert further pressure on irrigation capabilities by altering the volume and geographical distribution of available water resources. Warmer temperatures could also increase evapotranspiration, and water demands of irrigated crops.  Researchers from the Massachusetts Institute of Technology have explored the complex dynamics and interdependencies that define this space, with a particular focus on energy, water, and land systems interactions. 

The Impact
Model simulations under a business-as-usual scenario indicate that environmental change and economic development would increase water shortages and reduce irrigated yields in some regions of the US (particularly the Southwest) where irrigation is not sustainable, and for specific crops including cotton and forage. Yields of other crops (maize, soybean, sorghum, wheat) and regions would increase under this projection. These developments would require adaptive measures that range from growing less irrigation-intensive crops to relocating crop production, with implications for land use elsewhere, indicating the need for comprehensive integrated assessment of these complex economy-earth system interactions.

Summary
A critical component of affect the interaction of complex water-energy-land systems is demand for water for irrigation for crop production. A changing environment coupled with increased demand from other sectors, including for energy production, may limit water availability for irrigation, resulting in reduced crop yields. To investigate these complex, multi-sectoral interactions, researchers at the MIT Joint Program on the Science and Policy of Global Change developed a unique and comprehensive method to quantify the impact of water stress on irrigation while accounting for changes in water resources and competing uses from all US economic sectors. Incorporating a crop-yield reduction module and water-resources model (representing 99 river basins) into the MIT Integrated Global System Modeling (IGSM) framework (an integrated assessment model linking a global economic model to an Earth-system model), they assessed the effects of environmental change and economic development on water availability for irrigation in the US as well as subsequent impacts on crop yields by 2050. The researchers found that under a business-as-usual scenario, water shortages and reduce irrigated yields may occur in some regions (particularly the Southwest) where irrigation is not sustainable, and for specific crops (e.g., cotton and forage). Simulations with less environmental change show reduced effects of water stress on irrigated crop yields. Some level of adaptation would likely be feasible, for example, relocating croplands to regions with sustainable irrigation or switching to less irrigation-intensive crops or more water-efficient irrigation technology.

BER PM Contact
Bob Vallario

PI Contact
Elodie Blanc
MIT Joint Program on the Science and Policy of Global Change
eblanc@mit.edu

Funding
This research was funded by the U.S. Department of Energy Office of Science, and other government, industry and foundation sponsors of the MIT Joint Program.

Publication
Blanc, E., J. Caron, C. Fant and E. Monier. 2017. “Is Current Irrigation Sustainable in the United States? An Integrated Assessment of Climate Change Impact on Water Resources and Irrigated Crop Yields,” Earth’s Future, 5(8): 877-892. doi: 10.1002/2016EF000473.

Topic Areas:

  • Research Area: Multisector Dynamics (formerly Integrated Assessment)

Division: SC-23.1 Climate and Environmental Sciences Division, BER

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

May 10, 2019
Quantifying Decision Uncertainty in Water Management via a Coupled Agent-Based Model
Considering risk perception can improve the representation of human decision-making processes in age [more...]

May 09, 2019
Projecting Global Urban Area Growth Through 2100 Based on Historical Time Series Data and Future Scenarios
Study provides country-specific urban area growth models and the first dataset on country-level urba [more...]

May 05, 2019
Calibrating Building Energy Demand Models to Refine Long-Term Energy Planning
A new, flexible calibration approach improved model accuracy in capturing year-to-year changes in bu [more...]

May 03, 2019
Calibration and Uncertainty Analysis of Demeter for Better Downscaling of Global Land Use and Land Cover Projections
Researchers improved the Demeter model’s performance by calibrating key parameters and establi [more...]

Apr 22, 2019
Representation of U.S. Warm Temperature Extremes in Global Climate Model Ensembles
Representation of warm temperature events varies considerably among global climate models, which has [more...]

List all highlights (possible long download time)