Arid
DOI10.1016/j.jhydrol.2015.02.005
Storage and mobilization of natural and septic nitrate in thick unsaturated zones, California
Izbicki, John A.; Flint, Alan L.; O’Leary, David R.; Nishikawa, Tracy; Martin, Peter; Johnson, Russell D.; Clark, Dennis A.
通讯作者Izbicki, John A.
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2015
卷号524页码:147-165
英文摘要

Mobilization of natural and septic nitrate from the unsaturated zone as a result of managed aquifer recharge has degraded water quality from public-supply wells near Yucca Valley in the western Mojave Desert, California. The effect of nitrate storage and potential for denitrification in the unsaturated zone to mitigate increasing nitrate concentrations were investigated. Storage of water extractable nitrate in unsaturated alluvium up to 160 meters (m) thick, ranged from 420 to 6600 kilograms per hectare (kg/ha) as nitrogen (N) beneath undeveloped sites, from 6100 to 9200 kg/ha as N beneath unsewered sites. Nitrate reducing and denitrifying bacteria were less abundant under undeveloped sites and more abundant under unsewered sites; however, delta N-15-NO3, and delta O-18-NO3 data show only about 5-10% denitrification of septic nitrate in most samples although as much as 40% denitrification occurred in some parts the unsaturated zone and near the top of the water table. Storage of nitrate in thick unsaturated zones and dilution with low-nitrate groundwater are the primary attenuation mechanisms for nitrate from septic discharges in the study area. Numerical simulations of unsaturated flow, using the computer program TOUGH2, showed septic effluent movement through the unsaturated zone increased as the number and density of the septic tanks increased, and decreased with increased layering, and increased slope of layers, within the unsaturated zone. Managing housing density can delay arrival of septic discharges at the water table, especially in layered unsaturated alluvium, allowing time for development of strategies to address future water-quality issues. Published by Elsevier B.V.


英文关键词Nitrate Isotopes Unsaturated zone Modeling Bacteria Denitrification
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000354503300013
WOS关键词HYDRAULIC CONDUCTIVITY ; ISOTOPE FRACTIONATION ; MOJAVE DESERT ; GROUND-WATER ; CONTAMINATION ; NITROGEN ; DENITRIFICATION ; NITRIFICATION ; OXYGEN
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188773
作者单位US Geol Survey, Calif Water Sci Ctr, San Diego, CA 92101 USA
推荐引用方式
GB/T 7714
Izbicki, John A.,Flint, Alan L.,O’Leary, David R.,et al. Storage and mobilization of natural and septic nitrate in thick unsaturated zones, California[J]. United States Geological Survey,2015,524:147-165.
APA Izbicki, John A..,Flint, Alan L..,O’Leary, David R..,Nishikawa, Tracy.,Martin, Peter.,...&Clark, Dennis A..(2015).Storage and mobilization of natural and septic nitrate in thick unsaturated zones, California.JOURNAL OF HYDROLOGY,524,147-165.
MLA Izbicki, John A.,et al."Storage and mobilization of natural and septic nitrate in thick unsaturated zones, California".JOURNAL OF HYDROLOGY 524(2015):147-165.
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