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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
(责任编辑:李 娜)
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