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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


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