Geologic controls on the chemical behaviour of nitrate in riverside alluvial aquifers, Korea

Joong Hyuk Min, Seong Taek Yun, Kangjoo Kim, Hyoung Soo Kim, Dong Ju Kim

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

To investigate the origin and behaviour of nitrate in alluvial aquifers adjacent to Nakdong River, Korea, we chose two representative sites (Wolha and Yongdang) having similar land-use characteristics but different geology. A total of 96 shallow groundwater samples were collected from irrigation and domestic wells tapping alluvial aquifers. About 63% of the samples analysed had nitrate concentrations that exceeded the Korean drinking water limit (44.3 mg 1-1 NO3 -), and about 35% of the samples had nitrate concentrations that exceeded the Korean groundwater quality standard for agricultural use (88.6 mg 1-1 NO3 -). Based on nitrogen isotope analysis, two major nitrate sources were identified: synthetic fertilizer (about 4‰ δ15N) applied to farmland, and animal manure and sewage (15-20‰ δ15N) originating from upstream residential areas. Shallow groundwater in the farmland generally had higher nitrate concentrations than those in residential areas, due to the influence of synthetic fertilizer. Nitrate concentrations at both study sites were highest near the water table and then progressively decreased with depth. Nitrate concentrations are also closely related to the geologic characteristics of the aquifer. In Yongdang, denitrification is important in regulating nitrate chemistry because of the availability of organic carbon from a silt layer (about 20 m thick) below a thin, sandy surface aquifer. In Wolha, however, conservative mixing between farmland-recharged water and water coming from a village is suggested as the dominant process. Mixing ratios estimated based on the nitrate concentrations and the δ15N values indicate that water originating from the village affects the nitrate chemistry of the shallow groundwater underneath the farmland to a large extent.

Original languageEnglish
Pages (from-to)1197-1211
Number of pages15
JournalHydrological Processes
Volume17
Issue number6
DOIs
Publication statusPublished - 2003 Apr 30

Fingerprint

aquifer
nitrate
agricultural land
groundwater
village
chemical
fertilizer
nitrogen isotope
mixing ratio
water
denitrification
water table
manure
silt
sewage
organic carbon
drinking water
geology
irrigation
land use

Keywords

  • Aquifer geology
  • Denitrification
  • Nitrate pollution
  • Nitrogen isotope
  • Riverside alluvial aquifer

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Geologic controls on the chemical behaviour of nitrate in riverside alluvial aquifers, Korea. / Min, Joong Hyuk; Yun, Seong Taek; Kim, Kangjoo; Kim, Hyoung Soo; Kim, Dong Ju.

In: Hydrological Processes, Vol. 17, No. 6, 30.04.2003, p. 1197-1211.

Research output: Contribution to journalArticle

@article{098d1bb7e04341dd91db467961cca9c5,
title = "Geologic controls on the chemical behaviour of nitrate in riverside alluvial aquifers, Korea",
abstract = "To investigate the origin and behaviour of nitrate in alluvial aquifers adjacent to Nakdong River, Korea, we chose two representative sites (Wolha and Yongdang) having similar land-use characteristics but different geology. A total of 96 shallow groundwater samples were collected from irrigation and domestic wells tapping alluvial aquifers. About 63{\%} of the samples analysed had nitrate concentrations that exceeded the Korean drinking water limit (44.3 mg 1-1 NO3 -), and about 35{\%} of the samples had nitrate concentrations that exceeded the Korean groundwater quality standard for agricultural use (88.6 mg 1-1 NO3 -). Based on nitrogen isotope analysis, two major nitrate sources were identified: synthetic fertilizer (about 4‰ δ15N) applied to farmland, and animal manure and sewage (15-20‰ δ15N) originating from upstream residential areas. Shallow groundwater in the farmland generally had higher nitrate concentrations than those in residential areas, due to the influence of synthetic fertilizer. Nitrate concentrations at both study sites were highest near the water table and then progressively decreased with depth. Nitrate concentrations are also closely related to the geologic characteristics of the aquifer. In Yongdang, denitrification is important in regulating nitrate chemistry because of the availability of organic carbon from a silt layer (about 20 m thick) below a thin, sandy surface aquifer. In Wolha, however, conservative mixing between farmland-recharged water and water coming from a village is suggested as the dominant process. Mixing ratios estimated based on the nitrate concentrations and the δ15N values indicate that water originating from the village affects the nitrate chemistry of the shallow groundwater underneath the farmland to a large extent.",
keywords = "Aquifer geology, Denitrification, Nitrate pollution, Nitrogen isotope, Riverside alluvial aquifer",
author = "Min, {Joong Hyuk} and Yun, {Seong Taek} and Kangjoo Kim and Kim, {Hyoung Soo} and Kim, {Dong Ju}",
year = "2003",
month = "4",
day = "30",
doi = "10.1002/hyp.1189",
language = "English",
volume = "17",
pages = "1197--1211",
journal = "Hydrological Processes",
issn = "0885-6087",
publisher = "John Wiley and Sons Ltd",
number = "6",

}

TY - JOUR

T1 - Geologic controls on the chemical behaviour of nitrate in riverside alluvial aquifers, Korea

AU - Min, Joong Hyuk

AU - Yun, Seong Taek

AU - Kim, Kangjoo

AU - Kim, Hyoung Soo

AU - Kim, Dong Ju

PY - 2003/4/30

Y1 - 2003/4/30

N2 - To investigate the origin and behaviour of nitrate in alluvial aquifers adjacent to Nakdong River, Korea, we chose two representative sites (Wolha and Yongdang) having similar land-use characteristics but different geology. A total of 96 shallow groundwater samples were collected from irrigation and domestic wells tapping alluvial aquifers. About 63% of the samples analysed had nitrate concentrations that exceeded the Korean drinking water limit (44.3 mg 1-1 NO3 -), and about 35% of the samples had nitrate concentrations that exceeded the Korean groundwater quality standard for agricultural use (88.6 mg 1-1 NO3 -). Based on nitrogen isotope analysis, two major nitrate sources were identified: synthetic fertilizer (about 4‰ δ15N) applied to farmland, and animal manure and sewage (15-20‰ δ15N) originating from upstream residential areas. Shallow groundwater in the farmland generally had higher nitrate concentrations than those in residential areas, due to the influence of synthetic fertilizer. Nitrate concentrations at both study sites were highest near the water table and then progressively decreased with depth. Nitrate concentrations are also closely related to the geologic characteristics of the aquifer. In Yongdang, denitrification is important in regulating nitrate chemistry because of the availability of organic carbon from a silt layer (about 20 m thick) below a thin, sandy surface aquifer. In Wolha, however, conservative mixing between farmland-recharged water and water coming from a village is suggested as the dominant process. Mixing ratios estimated based on the nitrate concentrations and the δ15N values indicate that water originating from the village affects the nitrate chemistry of the shallow groundwater underneath the farmland to a large extent.

AB - To investigate the origin and behaviour of nitrate in alluvial aquifers adjacent to Nakdong River, Korea, we chose two representative sites (Wolha and Yongdang) having similar land-use characteristics but different geology. A total of 96 shallow groundwater samples were collected from irrigation and domestic wells tapping alluvial aquifers. About 63% of the samples analysed had nitrate concentrations that exceeded the Korean drinking water limit (44.3 mg 1-1 NO3 -), and about 35% of the samples had nitrate concentrations that exceeded the Korean groundwater quality standard for agricultural use (88.6 mg 1-1 NO3 -). Based on nitrogen isotope analysis, two major nitrate sources were identified: synthetic fertilizer (about 4‰ δ15N) applied to farmland, and animal manure and sewage (15-20‰ δ15N) originating from upstream residential areas. Shallow groundwater in the farmland generally had higher nitrate concentrations than those in residential areas, due to the influence of synthetic fertilizer. Nitrate concentrations at both study sites were highest near the water table and then progressively decreased with depth. Nitrate concentrations are also closely related to the geologic characteristics of the aquifer. In Yongdang, denitrification is important in regulating nitrate chemistry because of the availability of organic carbon from a silt layer (about 20 m thick) below a thin, sandy surface aquifer. In Wolha, however, conservative mixing between farmland-recharged water and water coming from a village is suggested as the dominant process. Mixing ratios estimated based on the nitrate concentrations and the δ15N values indicate that water originating from the village affects the nitrate chemistry of the shallow groundwater underneath the farmland to a large extent.

KW - Aquifer geology

KW - Denitrification

KW - Nitrate pollution

KW - Nitrogen isotope

KW - Riverside alluvial aquifer

UR - http://www.scopus.com/inward/record.url?scp=0037995578&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037995578&partnerID=8YFLogxK

U2 - 10.1002/hyp.1189

DO - 10.1002/hyp.1189

M3 - Article

VL - 17

SP - 1197

EP - 1211

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

IS - 6

ER -