Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0022-1694 |
EISSN | 1879-2707 |
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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