Identification of groundwater recharge sources and processes in a heterogeneous alluvial aquifer: results from multi‐level monitoring of hydrochemistry and environmental isotopes in a riverside agricultural area in Korea
Identifieur interne : 000E48 ( Istex/Corpus ); précédent : 000E47; suivant : 000E49Identification of groundwater recharge sources and processes in a heterogeneous alluvial aquifer: results from multi‐level monitoring of hydrochemistry and environmental isotopes in a riverside agricultural area in Korea
Auteurs : Byoung-Young Choi ; Seong-Taek Yun ; Bernhard Mayer ; Gi-Tak Chae ; Kyoung-Ho Kim ; Kangjoo Kim ; Yong-Kwon KohSource :
- Hydrological Processes [ 0885-6087 ] ; 2010-01-30.
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- KwdEn :
Abstract
We evaluated sources and pathways of groundwater recharge for a heterogeneous alluvial aquifer beneath an agricultural field, based on multi‐level monitoring of hydrochemistry and environmental isotopes of a riverside groundwater system at Buyeo, Korea. Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO3− and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO3−, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ18O and δ2H values of groundwater were also different between the two zones. Hydrochemical and δ18Oδ2H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO3−. The 3H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ18O and δ2H values and lower d‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. Copyright © 2009 John Wiley & Sons, Ltd.
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DOI: 10.1002/hyp.7488
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Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO3− and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO3−, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ18O and δ2H values of groundwater were also different between the two zones. Hydrochemical and δ18Oδ2H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO3−. The 3H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ18O and δ2H values and lower d‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. 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Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO3− and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO3−, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ18O and δ2H values of groundwater were also different between the two zones. Hydrochemical and δ18Oδ2H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO3−. The 3H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ18O and δ2H values and lower d‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. 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Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO3− and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO3−, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ18O and δ2H values of groundwater were also different between the two zones. Hydrochemical and δ18Oδ2H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO3−. The 3H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ18O and δ2H values and lower d‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. 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number="10"></count><count type="tableTotal" number="1"></count><count type="referenceTotal" number="34"></count></countGroup><titleGroup><title type="main" xml:lang="en">Identification of groundwater recharge sources and processes in a heterogeneous alluvial aquifer: results from multi‐level monitoring of hydrochemistry and environmental isotopes in a riverside agricultural area in Korea</title><title type="short" xml:lang="en">GROUNDWATER RECHARGE IN A HETEROGENEOUS ALLUVIAL AQUIFER</title></titleGroup><creators><creator xml:id="au1" creatorRole="author" affiliationRef="#af1 #af2"><personName><givenNames>Byoung‐Young</givenNames><familyName>Choi</familyName></personName></creator><creator xml:id="au2" creatorRole="author" affiliationRef="#af1 #af3" corresponding="yes"><personName><givenNames>Seong‐Taek</givenNames><familyName>Yun</familyName></personName><contactDetails><email>styun@korea.ac.kr</email></contactDetails></creator><creator xml:id="au3" creatorRole="author" affiliationRef="#af3"><personName><givenNames>Bernhard</givenNames><familyName>Mayer</familyName></personName></creator><creator xml:id="au4" creatorRole="author" affiliationRef="#af4"><personName><givenNames>Gi‐Tak</givenNames><familyName>Chae</familyName></personName></creator><creator xml:id="au5" creatorRole="author" affiliationRef="#af1"><personName><givenNames>Kyoung‐Ho</givenNames><familyName>Kim</familyName></personName></creator><creator xml:id="au6" creatorRole="author" affiliationRef="#af5"><personName><givenNames>Kangjoo</givenNames><familyName>Kim</familyName></personName></creator><creator xml:id="au7" creatorRole="author" affiliationRef="#af6"><personName><givenNames>Yong‐Kwon</givenNames><familyName>Koh</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="af1" countryCode="KR" type="organization"><unparsedAffiliation>Department of Earth and Environmental Sciences, Korea University, Seoul 136–701, Republic of Korea</unparsedAffiliation></affiliation><affiliation xml:id="af2" countryCode="KR" type="organization"><unparsedAffiliation>Korea Environmental Industry & Technology Institute, Seoul 122–706, Republic of Korea</unparsedAffiliation></affiliation><affiliation xml:id="af3" countryCode="CA" type="organization"><unparsedAffiliation>Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, Canada</unparsedAffiliation></affiliation><affiliation xml:id="af4" countryCode="KR" type="organization"><unparsedAffiliation>CO<sub>2</sub> Sequestration Research Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 305–350, Republic of Korea</unparsedAffiliation></affiliation><affiliation xml:id="af5" countryCode="KR" type="organization"><unparsedAffiliation>School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk 573‐701, Republic of Korea</unparsedAffiliation></affiliation><affiliation xml:id="af6" countryCode="KR" type="organization"><unparsedAffiliation>High‐Level Nuclear Waste Disposal Research Center, Korea Atomic Energy Research Institute, Daejeon 305–356, Republic of Korea</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en" type="author"><keyword xml:id="kwd1">heterogeneous alluvial aquifer</keyword><keyword xml:id="kwd2">riverside agricultural field</keyword><keyword xml:id="kwd3">hydrochemistry and environmental isotopes</keyword><keyword xml:id="kwd4">multi‐level monitoring</keyword><keyword xml:id="kwd5">groundwater recharge</keyword><keyword xml:id="kwd6">geologic control</keyword></keywordGroup><fundingInfo><fundingAgency>Korea Science and Engineering Foundation (KOSEF)</fundingAgency><fundingNumber>R01‐2007‐000‐20964‐0</fundingNumber></fundingInfo><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Abstract</title><p>We evaluated sources and pathways of groundwater recharge for a heterogeneous alluvial aquifer beneath an agricultural field, based on multi‐level monitoring of hydrochemistry and environmental isotopes of a riverside groundwater system at Buyeo, Korea. Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO<sub>3</sub><sup>−</sup> and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO<sub>3</sub><sup>−</sup>, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ<sup>18</sup>O and δ<sup>2</sup>H values of groundwater were also different between the two zones. Hydrochemical and δ<sup>18</sup>Oδ<sup>2</sup>H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO<sub>3</sub><sup>−</sup>. The <sup>3</sup>H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ<sup>18</sup>O and δ<sup>2</sup>H values and lower <i>d</i>‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. Copyright © 2009 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Identification of groundwater recharge sources and processes in a heterogeneous alluvial aquifer: results from multi‐level monitoring of hydrochemistry and environmental isotopes in a riverside agricultural area in Korea</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>GROUNDWATER RECHARGE IN A HETEROGENEOUS ALLUVIAL AQUIFER</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Identification of groundwater recharge sources and processes in a heterogeneous alluvial aquifer: results from multi‐level monitoring of hydrochemistry and environmental isotopes in a riverside agricultural area in Korea</title></titleInfo><name type="personal"><namePart type="given">Byoung‐Young</namePart><namePart type="family">Choi</namePart><affiliation>Department of Earth and Environmental Sciences, Korea University, Seoul 136–701, Republic of Korea</affiliation><affiliation>Korea Environmental Industry & Technology Institute, Seoul 122–706, Republic of Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Seong‐Taek</namePart><namePart type="family">Yun</namePart><affiliation>Department of Earth and Environmental Sciences, Korea University, Seoul 136–701, Republic of Korea</affiliation><affiliation>Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, Canada</affiliation><affiliation>Department of Earth and Environmental Sciences, Korea University, Seoul 136–701, Republic of Korea.===</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Bernhard</namePart><namePart type="family">Mayer</namePart><affiliation>Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, Canada</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Gi‐Tak</namePart><namePart type="family">Chae</namePart><affiliation>CO2 Sequestration Research Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 305–350, Republic of Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Kyoung‐Ho</namePart><namePart type="family">Kim</namePart><affiliation>Department of Earth and Environmental Sciences, Korea University, Seoul 136–701, Republic of Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Kangjoo</namePart><namePart type="family">Kim</namePart><affiliation>School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk 573‐701, Republic of Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Yong‐Kwon</namePart><namePart type="family">Koh</namePart><affiliation>High‐Level Nuclear Waste Disposal Research Center, Korea Atomic Energy Research Institute, Daejeon 305–356, Republic of Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2010-01-30</dateIssued><dateCaptured encoding="w3cdtf">2008-07-25</dateCaptured><dateValid encoding="w3cdtf">2009-09-07</dateValid><copyrightDate encoding="w3cdtf">2010</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">10</extent><extent unit="tables">1</extent><extent unit="references">34</extent></physicalDescription><abstract lang="en">We evaluated sources and pathways of groundwater recharge for a heterogeneous alluvial aquifer beneath an agricultural field, based on multi‐level monitoring of hydrochemistry and environmental isotopes of a riverside groundwater system at Buyeo, Korea. Two distinct groundwater zones were identified with depth: (1) a shallow oxic groundwater zone, characterized by elevated concentrations of NO3− and (2) a deeper (>10–14 m from the ground surface) sub‐oxic groundwater zone with high concentrations of dissolved Fe, silica, and HCO3−, but little nitrate. The change of redox zones occurred at a depth where the aquifer sediments change from an upper sandy stratum to a silty stratum with mud caps. The δ18O and δ2H values of groundwater were also different between the two zones. Hydrochemical and δ18Oδ2H data of oxic groundwater are similar to those of soil water. This illustrates that recharge of oxic groundwater mainly occurs through direct infiltration of rain and irrigation water in the sandy soil area where vegetable cropping with abundant fertilizer use is predominant. Oxic groundwater is therefore severely contaminated by agrochemical pollutants such as nitrate. In contrast, deeper sub‐oxic groundwater contains only small amounts of dissolved oxygen (DO) and NO3−. The 3H contents and elevated silica concentrations in sub‐oxic groundwater indicate a somewhat longer mean residence time of groundwater within this part of the aquifer. Sub‐oxic groundwater was also characterized by higher δ18O and δ2H values and lower d‐excess values, indicating significant evaporation during recharge. We suggest that recharge of sub‐oxic groundwater occurs in the areas of paddy rice fields where standing irrigation and rain water are affected by strong evaporation, and that reducing conditions develop during subsequent sub‐surface infiltration. This study illustrates the existence of two groundwater bodies with different recharge processes within an alluvial aquifer. Copyright © 2009 John Wiley & Sons, Ltd.</abstract><note type="funding">Korea Science and Engineering Foundation (KOSEF) - No. R01‐2007‐000‐20964‐0; </note><subject lang="en"><genre>keywords</genre><topic>heterogeneous alluvial aquifer</topic><topic>riverside agricultural field</topic><topic>hydrochemistry and environmental isotopes</topic><topic>multi‐level monitoring</topic><topic>groundwater recharge</topic><topic>geologic control</topic></subject><relatedItem type="host"><titleInfo><title>Hydrological Processes</title><subTitle>An International Journal</subTitle></titleInfo><titleInfo type="abbreviated"><title>Hydrol. Process.</title></titleInfo><genre type="journal">journal</genre><subject><genre>article-category</genre><topic>Research Article</topic></subject><identifier type="ISSN">0885-6087</identifier><identifier type="eISSN">1099-1085</identifier><identifier type="DOI">10.1002/(ISSN)1099-1085</identifier><identifier type="PublisherID">HYP</identifier><part><date>2010</date><detail type="volume"><caption>vol.</caption><number>24</number></detail><detail type="issue"><caption>no.</caption><number>3</number></detail><extent unit="pages"><start>317</start><end>330</end><total>14</total></extent></part></relatedItem><identifier type="istex">5BA52B155FF4F9D8000A39711C188650444493C5</identifier><identifier type="DOI">10.1002/hyp.7488</identifier><identifier type="ArticleID">HYP7488</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright © 2009 John Wiley & Sons, Ltd.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>John Wiley & Sons, Ltd.</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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