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Hydrogenandoxygenisotopebasedtransformationstudiesofsurface
waterandgroundwaterinplainslakesandswamps
1
2
1
2,3
LUXiaohui,WANGMengyao,GONGXulong ,WUXin,
1
ZHANGHaitao,WEIYantong 1
(1.SchoolofEarthSciencesandEngineering,HohaiUniversity,Nanjing 211100,China;
2.GeologicalSurveyofJiangsuProvince,Nanjing 210049,China;
3.ChinaUniversityofGeosciences,Wuhan 430074,China)
Abstract:Theinterconversionbetweensurfacewaterandgroundwaterandthequantificationofgroundwaterre
chargeareimportantelementsinthestudyoflakewatercycle.Inthispaper,wecollectedlakewaterandgroundw
atersamplesfromYuandangLake ,testedtheirstableisotopecompositionsofhydrogenandoxygenandhydrochemi
calcompositions ,analyzedtheirhydrochemicaltypesusingPiper’strilineardiagrams,andobtainedthegroundwa
terflowfieldsofYuandangLakeduringthedryseason (December2022)andtherainyseason(June2023)fromthe
measuredgroundwaterintheboreholes,andanalyzedthetransformationrelationshipbetweensurfacewaterand
groundwaterqualitativelywiththecombinationoftheelectricalconductivity (EC)andtotaldissolvedsolids(TDS),
andquantifiedtheamountofrechargefromtheisotopewaterbalanceequations.Qualitativelyanalyzedthetransfor
mationrelationshipbetweensurfacewater - groundwater ,andquantitativelyevaluatedtheamountoftransformation
betweenlakewater,groundwater,riverwaterandprecipitationbycombiningisotopicwaterbalanceequationsand
linearend - elementmixingmodels.Theresultsshowedthatthehydrochemistrytypesoflakewaterandgroundwater
- 2 - 2 + + 2 +
inthestudyareawerebothoftheHCO 3 ·SO 4 ·Ca ·Na·Mg type,andthelakewaterwasrechargedby
groundwaterinboththedryandrainyseasons ,andlinearregressionequationswerederivedforthestableisotopes
oflakewaterforhydrogenandoxygeninthedryandrainyseasons,withsmallerslopesintherainyseasonindica
tingthatevaporationwasmoreintense.Thelakeismainlyrechargedbytheinletriverwater ,shallowgroundwater
andprecipitation,whosethreerechargeratiosare59%,26% and15% inthedryseasonand23%,39% and
38% intherainyseason,respectively.Theresultsofthispaperprovideascientificevidencefortherationaldevel
opmentandprotectionoftheYuandangLakeareaandtheTaihuLakebasin.
Keywords:plainsandlakes;YuandangLake;hydrogenandoxygenisotopes;Hydrochemicalcharacterization;
isotopewaterbalancemodelling;linearend - elementhybridmodelling
(责任编辑:耿庆斋)
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