Contribution of nitrate-nitrogen concentration in groundwater to stream water in an agricultural head watershed.

Abstract:

:This study characterized nitrate-nitrogen (NO3-N) concentrations in groundwater and stream water in an agricultural head watershed in South Korea and identified the pollution load of NO3-N as a result of the groundwater entering streams using field surveys, analyses of chemical constituents, and numerical modeling. The mean NO3-N concentration in groundwater was 7.373 mg/L, which is approximately 1.9 times higher than concentrations found in stream water. The groundwater and stream water samples belonged to the Ca-HCO3 type. The concentration of NO3-N in groundwater tended to increase in the lowland areas downstream. There was seasonal variations of NO3-N in both the groundwater and stream water samples, with increases in concentration during the dry season (January-April) and decreases during the wet season (June-October). The NO3-N load in stream water to that in groundwater (R) was higher during the wet season (September) than the dry season (March), with R distinctly increasing in upstream areas relative to downstream areas, indicating that during the wet season, a large amount of NO3-N is introduced into stream water from groundwater. By analyzing the relationship between groundwater and stream water and through NO3-N transport modeling, it was revealed that in the watershed, the nitrate-N load in stream water is greatly augmented by inputs from groundwater, particularly in the middle and downstream areas.

journal_name

Environ Res

journal_title

Environmental research

authors

Lee CM,Hamm SY,Cheong JY,Kim K,Yoon H,Kim M,Kim J

doi

10.1016/j.envres.2020.109313

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

109313

eissn

0013-9351

issn

1096-0953

pii

S0013-9351(20)30206-1

journal_volume

184

pub_type

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