Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aa5fb2 |
The use and re-use of unsustainable groundwater for irrigation: a global budget | |
Grogan, Danielle S.1; Wisser, Dominik1,2; Prusevich, Alex1; Lammers, Richard B.1; Frolking, Steve1 | |
2017-03-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2017 |
卷号 | 12期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Germany |
英文摘要 | Depletion of groundwater aquifers across the globe has become a significant concern, as groundwater is an important and often unsustainable source of irrigation water. Simultaneously, the field of water resource management has seen a lively debate over the concepts and metrics used to assess the downstream re-use of agricultural runoff, with most studies focusing on surface water balances. Here, we bring these two lines of research together, recognizing that depletion of aquifers leads to large amounts of groundwater entering surface water storages and flows by way of agricultural runoff. While it is clear that groundwater users will be impacted by reductions in groundwater availability, there is a major gap in our understanding of potential impacts downstream of groundwater pumping locations. We find that the volume of unsustainable groundwater that is re-used for irrigation following runoff from agricultural systems is nearly as large as the volume initially extracted from reservoirs for irrigation. Basins in which the volume of irrigation water reused is equal to or greater than the volume of water initially used (which is possible due to multiple re-use of the same water) contain 33 million hectares of irrigated land and are home to 1.3 billion people. Some studies have called for increasing irrigation efficiency as a solution to water shortages. We find that with 100% irrigation efficiency, global demand for unsustainable groundwater is reduced by 52%, but not eliminated. In many basins, increased irrigation efficiency leads to significantly decreased river low flows; increasing irrigation efficiency to 70% globally decreases total surface water supplies by. similar to 600 km 3 yr-(1). These findings illustrate that estimates of aquifer depletion alone underestimate the importance of unsustainable groundwater to sustaining surface water systems and irrigated agriculture. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000397541000001 |
WOS关键词 | WATER-USE ; SURFACE-WATER ; EFFICIENCY ; PRODUCTIVITY ; DEPLETION ; STRESS |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35444 |
专题 | 气候变化 |
作者单位 | 1.Univ New Hampshire, Inst Study Earth & Space, Inst Study Oceans & Space, Durham, NH 03824 USA; 2.Zentrum Entwicklungsforschung, Ctr Dev Res ZEF, Walter Flex Str 3, D-53113 Bonn, Germany |
推荐引用方式 GB/T 7714 | Grogan, Danielle S.,Wisser, Dominik,Prusevich, Alex,et al. The use and re-use of unsustainable groundwater for irrigation: a global budget[J]. ENVIRONMENTAL RESEARCH LETTERS,2017,12(3). |
APA | Grogan, Danielle S.,Wisser, Dominik,Prusevich, Alex,Lammers, Richard B.,&Frolking, Steve.(2017).The use and re-use of unsustainable groundwater for irrigation: a global budget.ENVIRONMENTAL RESEARCH LETTERS,12(3). |
MLA | Grogan, Danielle S.,et al."The use and re-use of unsustainable groundwater for irrigation: a global budget".ENVIRONMENTAL RESEARCH LETTERS 12.3(2017). |
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