Residence times of groundwater and nitrate transport in coastal aquifer systems: Daweijia area, northeastern China

The Science of the Total Environment
D M HanXianfang Song

Abstract

Groundwater within the coastal aquifer systems of the Daweijia area in northeastern China is characterized by a large of variations (33-521mg/L) in NO3(-) concentrations. Elevated nitrate concentrations, in addition to seawater intrusion in the Daweijia well field, both attributable to anthropogenic activities, may impact future water-management practices. Chemical and stable isotopic (δ(18)O, δ(2)H) analysis, (3)H and CFCs methods were applied to provide a better understanding of the relationship between the distribution of groundwater mean residence time (MRT) and nitrate transport, and to identify sources of nitrate concentrations in the complex coastal aquifer systems. There is a relatively narrow range of isotopic composition (ranging from -8.5 to -7.0‰) in most groundwater. Generally higher tritium contents observed in the wet season relative to the dry season may result from rapid groundwater circulation in response to the rainfall through the preferential flow paths. In the well field, the relatively increased nitrate concentrations of groundwater, accompanied by the higher tritium contents in the wet season, indicate the nitrate pollution can be attributed to domestic wastes. The binary exponential and piston-flow mixi...Continue Reading

Citations

Sep 25, 2016·The Science of the Total Environment·Mouna MalkiRedouane Choukr-Allah
Jul 2, 2020·Environmental Science and Pollution Research International·Zekang HeShengtian Yang
Oct 16, 2021·The Science of the Total Environment·Dongmei Han, Matthew J Currell

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