Irrigation demand and supply, given projections of climate and land-use change, in Yolo County, California

Mehta, Vishal K.; Haden, Van R.; Joyce, Brian; Purkey, David; Jackson, Louise E.

doi:10.1016/j.agwat.2012.10.021

Cited by 99 publications

(53 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although human water use still accounts for a small proportion of total water on and below the surface (see Oki and Kanae, 2006), total human withdrawals currently include around 26 % of terrestrial evaporation and 54 % of the accessible surface runoff that is geographically and temporally available (Postel et al, 1996). There are already major water scarcity issues across highly populated regions of the globe (e.g., Falkenmark, 2013;Schiermeier, 2014), which raise fundamental concerns about how future demand should be supplied, particularly considering climate change (e.g., Arnell, 1999Arnell, , 2004Tao et al, 2003;Döll, 2009;Taylor et al, 2013; Hanasaki et al, 2013a, b;Wada et al, 2013;Milano et al, 2013;Mehta et al, 2013;Schewe et al, 2014). Such important threats to water security necessitate a detailed understanding of water availability and demand in time and space; and therefore largescale models are required for impact assessments.…”

Section: Modeling Human-water Interactionsmentioning

confidence: 99%

On inclusion of water resource management in Earth system models – Part 1: Problem definition and representation of water demand

Nazemi

Wheater

2015

Hydrol. Earth Syst. Sci.

164

101

View full text Add to dashboard Cite

Abstract. Human activities have caused various changes to the Earth system, and hence the interconnections between human activities and the Earth system should be recognized and reflected in models that simulate Earth system processes. One key anthropogenic activity is water resource management, which determines the dynamics of human-water interactions in time and space and controls human livelihoods and economy, including energy and food production. There are immediate needs to include water resource management in Earth system models. First, the extent of human water requirements is increasing rapidly at the global scale and it is crucial to analyze the possible imbalance between water demands and supply under various scenarios of climate change and across various temporal and spatial scales. Second, recent observations show that human-water interactions, manifested through water resource management, can substantially alter the terrestrial water cycle, affect land-atmospheric feedbacks and may further interact with climate and contribute to sea-level change. Due to the importance of water resource management in determining the future of the global water and climate cycles, the World Climate Research Program's Global Energy and Water Exchanges project (WRCP-GEWEX) has recently identified gaps in describing humanwater interactions as one of the grand challenges in Earth system modeling (GEWEX, 2012). Here, we divide water resource management into two interdependent elements, related firstly to water demand and secondly to water supply and allocation. In this paper, we survey the current literature on how various components of water demand have been included in large-scale models, in particular land surface and global hydrological models. Issues of water supply and allocation are addressed in a companion paper. The available algorithms to represent the dominant demands are classified based on the demand type, mode of simulation and underlying modeling assumptions. We discuss the pros and cons of available algorithms, address various sources of uncertainty and highlight limitations in current applications. We conclude that current capability of large-scale models to represent human water demands is rather limited, particularly with respect to future projections and coupled landatmospheric simulations. To fill these gaps, the available models, algorithms and data for representing various water demands should be systematically tested, intercompared and improved. In particular, human water demands should be considered in conjunction with water supply and allocation, particularly in the face of water scarcity and unknown future climate. Background and scope Large-scale modeling -an introduction to land-surface and global hydrological modelsThe Earth system is an integrated system that unifies the physical processes at the Earth's surface. These processes include a wide range of feedbacks and interactions between and within the atmosphere, land and oceans and cover the global cycles of climate, water and carbon that sup...

show abstract

Section: Modeling Human-water Interactionsmentioning

confidence: 99%

On inclusion of water resource management in Earth system models – Part 1: Problem definition and representation of water demand

Nazemi

Wheater

2015

Hydrol. Earth Syst. Sci.

164

101

View full text Add to dashboard Cite

show abstract

“…It combines bio-physical factors influencing the water runoff, such as climate, groundwater hydrology, and land cover with socioeconomic factors such as land use, infrastructure, and water management priorities [17,20]. WEAP has been successfully used for the simulation of climate, land use, and population growth changes [18,19,29].…”

Section: Weapmentioning

confidence: 99%

Future of Water Supply and Demand in the Middle Drâa Valley, Morocco, under Climate and Land Use Change

Johannsen

Hengst

Goll

et al. 2016

Water

View full text Add to dashboard Cite

Abstract:Regions of scarce fresh water resources, such as the Middle East and North Africa, are facing great challenges already today, and even more in the future, due to climatic and socioeconomic changes. The Middle Drâa valley in Morocco is one of many semi-arid to arid mountainous areas struggling with increasing water scarcity threatening self-sufficient husbandry. In order to maintain people's livelihoods water management needs to be adapted. The Water Evaluation And Planning System (WEAP) software has been widely used to examine complex water systems in the water resource planning sector all around the world and proved to be a helpful asset to show the various interactions of water supply and demand. This paper presents the application of WEAP on the Middle Draâ valley's water demand and supply, including several socioeconomic and land use scenarios under one basic climate change scenario. The climate scenario shows a significant decrease in available water resources up to 2029 while all socioeconomic scenarios show an increase in water demand. In years of droughts groundwater is used for irrigation, leading to increasingly depleted aquifers. The aquifers are recharged by percolation losses from irrigation and by river bed infiltration the latter of which is stronger in the northern oases than in the southern oases due to water withdrawal rules. A drastic reduction of irrigated agricultural area is the only solution to guarantee sustainable water use.

show abstract

“…Though predicted changes in the total amount of precipitation are currently equivocal, modeling studies consistently show that climate change will significantly increase potential evapotranspiration in California's specialty crop growing regions, and that changing irrigation practices can partly but not wholly compensate (Purkey et al 2008;Joyce et al 2011;Mehta et al 2013). These analyses generally use a high degree of aggregation (e.g., grouping all annual crops together), so the effect of changes in water supply and demand for each particular crop remain to be explored in more detail.…”

Section: Previous Work On Specialty Crops and Climate Changementioning

confidence: 99%

Vulnerability of California specialty crops to projected mid-century temperature changes

et al. 2017

View full text Add to dashboard Cite

Increasing global temperatures are likely to have major impacts on agriculture, but the effects will vary by crop and location. This paper describes the temperature sensitivity and exposure of selected specialty crops in California. We used literature synthesis to create several sensitivity indices (from 1 to 4) to changes in winter minimum and summer maximum temperature for the top 14 specialty crops. To estimate exposure, we used seasonal period change analysis of mid-century minimum and maximum temperature changes downscaled to county level from CMIP5 models. We described crop vulnerability on a county basis as (crop sensitivity index × county climate exposure × area of crop in county); individual crop vulnerabilities were combined to create an aggregate index of specialty crop vulnerability by county. We also conducted analyses scaled by crop value rather than area, and normalized to Climatic Change

show abstract

Irrigation demand and supply, given projections of climate and land-use change, in Yolo County, California

Cited by 99 publications

References 36 publications

On inclusion of water resource management in Earth system models – Part 1: Problem definition and representation of water demand

On inclusion of water resource management in Earth system models – Part 1: Problem definition and representation of water demand

Future of Water Supply and Demand in the Middle Drâa Valley, Morocco, under Climate and Land Use Change

Vulnerability of California specialty crops to projected mid-century temperature changes

Contact Info

Product

Resources

About