Identifying Agricultural Managed Aquifer Recharge Locations to Benefit Drinking Water Supply in Rural Communities

Identifying Agricultural Managed Aquifer Recharge Locations to Benefit Drinking Water Supply in Rural Communities
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确定农业管理的含水层补给地点,以改善农村社区的饮用水供应

DOI:
10.1029/2020wr028811
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发表时间:
2021
影响因子:
5.4
通讯作者:
Dahlke, Helen E.
Dahlke, Helen E.
中科院分区:
地球科学1区
文献类型:
--
作者:
Marwaha, Nisha;Kourakos, George;Levintal, Elad;Dahlke, Helen E.

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加州南部的中央谷是世界上最高产的农业区之一。然而,几十年来地下水的使用超过了可持续的产量,使农村社区极易受到饮用水供应短缺和污染的影响。随着国家法规开始解决这些问题,需要设计适应性和适当的管理系统,以提高农村社区的复原力。在农村社区附近的农业用地(Ag-MAR)上有针对性地管理含水层补给就是这样一种战略,它有可能稳定地下水位,保持或改善国内供水威尔斯井的地下水质量。在这里,我们提出了一个基于地理信息系统的多准则决策分析,结合生物物理数据(土壤,土地利用和地表水输送)与地下水建模和粒子跟踪,以确定合适的农业地块多效益地下水补给井捕获区内的288个农村社区。使用脆弱性指数对地下水供应的变化进行优先排序,该指数来自井的依赖和故障,杀虫剂的应用,地面沉降和社会经济数据。我们的分析在288个社区中的149个社区的水井捕获区内确定了2,998个适合Ag-MAR的地块,其中144个社区主要依赖地下水作为饮用水。大多数确定的Ag-MAR地块服务于被列为对地下水供应变化具有极端或非常高的脆弱性的社区。我们的研究产生了对导致社区脆弱性和对饮用水供应变化的恢复力的因素的新理解,并可用于讨论帮助实现稳定和高质量供水的行动。
The southern Central Valley of California is one of the most productive agricultural regions in the world. Yet, decades of groundwater use beyond sustainable yield have left rural communities highly vulnerable to shortages and contamination of their drinking water supply. As state regulation begins to address these issues, a need exists to design adaptive and appropriate management systems to increase resilience of rural communities. Targeted managed aquifer recharge on agricultural land (Ag‐MAR) near rural communities is one such strategy that could potentially stabilize groundwater tables and maintain or improve groundwater quality in domestic supply wells. Here we present a geographic information system‐based multicriteria decision analysis that combines biophysical data (soils, land use, and surface water conveyance) with groundwater modeling and particle tracking to identify suitable agricultural land parcels for multibenefit groundwater recharge within well capture zones of 288 rural communities. Parcels are prioritized using a vulnerability index to change in groundwater supply, derived from well reliance and failures, pesticide applications, land subsidence, and socio‐economic data. Our analysis identifies 2,998 suitable land parcels for Ag‐MAR within the well capture zones of 149 of the 288 communities, of which 144 rely mainly on groundwater for drinking water. The majority of identified Ag‐MAR parcels serve communities ranked as having extreme or very high vulnerability to changes in groundwater supply. Our research produces new understanding of factors contributing to community vulnerability and resilience to changes in drinking water supply and can be used to discuss actions to help achieve a stable and high‐quality water supply.
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