DOI: 10.5194/hess-18-1339-2014
Scopus记录号: 2-s2.0-84898051736
论文题名: Irrigation efficiency and water-policy implications for river basin resilience
作者: Scott C ; A ; , Vicuña S ; , Blanco-Gutiérrez I ; , Meza F ; , Varela-Ortega C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 4 起始页码: 1339
结束页码: 1348
语种: 英语
Scopus关键词: Ecosystems
; Groundwater
; Irrigation
; Public policy
; Surface waters
; Watersheds
; Economic productivity
; Estuarine ecosystems
; Groundwater pumping
; Hydrological variability
; Irrigation efficiency
; Surface water and groundwaters
; Unintended consequences
; Water storage capacity
; Water management
; environmental policy
; environmental protection
; freshwater
; hydrological change
; irrigation system
; river basin
; salinity
; surface water
; water availability
; water demand
; water planning
; water resource
; water storage
; water use
; Chile
; Spain
; United States
英文摘要: Rising demand for food, fiber, and biofuels drives expanding irrigation withdrawals from surface water and groundwater. Irrigation efficiency and water savings have become watchwords in response to climate-induced hydrological variability, increasing freshwater demand for other uses including ecosystem water needs, and low economic productivity of irrigation compared to most other uses. We identify three classes of unintended consequences, presented here as paradoxes. Ever-tighter cycling of water has been shown to increase resource use, an example of the efficiency paradox. In the absence of effective policy to constrain irrigated-area expansion using "saved water", efficiency can aggravate scarcity, deteriorate resource quality, and impair river basin resilience through loss of flexibility and redundancy. Water scarcity and salinity effects in the lower reaches of basins (symptomatic of the scale paradox) may partly be offset over the short-term through groundwater pumping or increasing surface water storage capacity. However, declining ecological flows and increasing salinity have important implications for riparian and estuarine ecosystems and for non-irrigation human uses of water including urban supply and energy generation, examples of the sectoral paradox. This paper briefly considers three regional contexts with broadly similar climatic and water-resource conditions - central Chile, southwestern US, and south-central Spain - where irrigation efficiency directly influences basin resilience. The comparison leads to more generic insights on water policy in relation to irrigation efficiency and emerging or overdue needs for environmental protection. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78277
Appears in Collections: 气候变化事实与影响
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作者单位: University of Arizona, School of Geography and Development, Udall Center for Studies in Public Policy, Tucson, AZ, United States; Pontificia Universidad Católica de Chile, Centro Interdisciplinario de Cambio Global, Santiago, Chile; Universidad Politécnica de Madrid, Department of Agricultural Economics and Social Sciences, Madrid, Spain
Recommended Citation:
Scott C,A,, Vicuña S,et al. Irrigation efficiency and water-policy implications for river basin resilience[J]. Hydrology and Earth System Sciences,2014-01-01,18(4)