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                            Effectofdifferentdevelopmentschemesofshallowgeothermalenergy
                                         onsalinizationofdeepfreshgroundwater

                                              1
                                                                                 2
                                                                       2
                                                            1
                                       LIZhao,LUOZujiang,YANGLu,HUYing
                               (1.SchoolofEarthSciencesandEngineering,HohaiUniversity,Nanjing 211100,China;
                                2.Geo - engineeringInvestigationInstituteofJiangsuProvince,Nanjing 211102,China)
                  Abstract:Inordertoensurethesustainabledevelopmentofshallowgeothermalenergyandcontrolthesalinization
                  offreshgroundwaterindeepaquifer ,theeffectofshallowgeothermalenergydevelopmentoncontrolofgroundwater
                  salinizationisevaluated.Basedonthetheoryofgroundwaterseepage ,heattransportandsolutetransport,the
                  groundwatersourceheatpumpsystemofJiangsuGeologicalEngineeringSurveyInstitute (NantongBranch)istaken
                  astheresearchobject.Ahydro - thermal - chemicalmulti - fieldcouplednumericalmodelforthegroundwatersystem
                  isestablished.Thenumericalmodelpredictshydraulichead , temperatureandchemistryconcentrationinthe
                  processoftheshallowgeothermalenergyimplementation.Theplanofshallowgeothermalenergyimplementationis
                  optimizedbyadjustingtheincreasedutilizationtemperaturedifferenceanddecreasingcirculationratioinsummer.
                  Thecontroleffectsofthermaltransfixionandgroundwatersalinizationarequantitativelyevaluated.Theresultsshow
                  thatincreasingthetemperaturedifferenceanddecreasingthecirculationratioinsummercaneffectivelyalleviate
                  thermaltransfixionandfreshgroundwatersalinization.Thecontroleffectofincreasingtheutilizationtemperature
                  differenceonthesalinityofdeepsubsurfacefreshwaterismoresignificant ,andthecontroleffectofdecreasingthe
                  summerirrigationratioonthermalpenetrationismoresignificant.
                  Keywords:groundwaterheatpumpsystem;saltwaterintrusion;multi - fieldcoupling;numericalsimulation

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