干旱区生态环境知识资源中心(Arid): Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells

Arid

DOI	10.1016/j.jconhyd.2019.103521
	Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells
	Bastani, Mehrdad 1; Harter, Thomas 2
通讯作者	Bastani, Mehrdad
来源期刊	JOURNAL OF CONTAMINANT HYDROLOGY
ISSN	0169-7722
EISSN	1873-6009
出版年	2019
卷号	226
英文摘要	Nitrate in drinking water may cause serious health problems for consumers. Agricultural activities are known to be the main source of groundwater nitrate contaminating rural domestic and urban public water supply wells in farming regions. Management practices have been proposed to reduce the amount of nitrate in groundwater, including improved nutrient management practices and pump and fertilize with nitrate-affected irrigation wells. Here, we evaluate the feasibility and long-term impacts of agricultural managed aquifer recharge (AgMAR) in the source area of public water supply wells. A numerical model of nitrate fate and transport was developed for the Modesto basin, part of California's Cehtral Valley aquifer system. The basin is representative of semi-arid agricultural regions around the world with a diversity of crop types, overlying an unconsolidated sedimentary aquifer system. A local public supply well in an economically disadvantaged community surrounded by farmland was the focus of this study. Model scenarios implemented include business as usual, alternative low-impact crops, and Ag-MAR in the source area of the public supply well. Alternative nutrient management and recharge practices act as remediation tools in the area between farmland and the public supply well. Improved agricultural source area management practices are shown to be an effective tool to maintain or even enhance groundwater quality in the targeted supply well while remediating ambient groundwater. Best results are obtained when lowering nitrate load while also increasing recharge in the source area simultaneously. This scenario reduced nitrate in the supply well's drinking water by 80% relative to the business as usual scenario. It also remediated ambient groundwater used by domestic wells between the source area farmlands and the supply well and showed 60% more reduction of nitrate after 60 years of application. Increasing recharge led to shorter initial response time (five years) and showed the most sustainable impact. Our analysis further suggests that Ag-MAR in a highly discontinuous, wide-spread pattern leads to slow water quality response and may not yield sufficient water quality improvements.
英文关键词	Groundwater quality Nitrate pollution Agricultural management practices Contributing recharge area Crop change Groundwater remediation
类型	Article
语种	英语
国家	USA
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000485854600006
WOS关键词	CENTRAL VALLEY ; NITROGEN ; LAND ; CONTAMINATION ; FERTILIZERS ; IMPACTS ; RIVER
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
来源机构	University of California, Davis
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216899
作者单位	1.Univ Calif Davis, Dept Civil & Environm Engn, 1 Shields Ave, Davis, CA 95616 USA; 2.Univ Calif Davis, Dept Land Air & Water Resources, 1 Shields Ave, Davis, CA 95616 USA
推荐引用方式 GB/T 7714	Bastani, Mehrdad,Harter, Thomas. Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells[J]. University of California, Davis,2019,226.
APA	Bastani, Mehrdad,&Harter, Thomas.(2019).Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells.JOURNAL OF CONTAMINANT HYDROLOGY,226.
MLA	Bastani, Mehrdad,et al."Source area management practices as remediation tool to address groundwater nitrate pollution in drinking supply wells".JOURNAL OF CONTAMINANT HYDROLOGY 226(2019).