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1、以上研究成果对乌兰盆地重大水源地建造、地下水资源的合理开发利用以及生态环境保护提供科学依据，为寻求西北地区一般的水资源开发利用模式积累经验。关键词：地下水，数值模拟，可持续开采阈值，乌兰盆地IIAbstractWulanislocatedateastQaidamBasin.Theclimateinthisregionissemi-aridplateaucontinentalcontinentwiththefeaturesofstrongandlong-durationevaporation,andlessandconcentratedrainfa
2、ll.Groundwateriswidelydistributedwithgoodwaterqualityandwaterstability.However,thedistributionofsurfacewaterspaceinthestudyareaisveryuneven.Also,thefreezingperiodislong.Therefore,itisurgenttofindwatersupplyschemeforgroundwaterresources.Takinggroundwaterdynamicstheoryasaguide,
3、thisthesisisaimedtoexplorethesustainableutilizationofgroundwaterinWulanbasin.Inthisstudy,numericalsimulationmethodisusedtostudytherulesoflakedegradedareaandinvestigatetheinfluenceofsurroundingecologicalenvironmentindifferentminingcase.Asaresult,thethresholdofsustainableground
4、waterexploitationandgroundwaterprotectionmeasuresareputforward.Somemajoropinionsandconclusionsobtainedfromthisstudyareshowedbelow:（1）Definingthesimulationarea.Thestudyareaissurroundedbyfourmountainsandonelake,whichareMaoniumountain,Amuneigemountain,QinghaiNanshan,Buhetemounta
5、inandChaikailake,inthedirectionofsouthwest,northwest,northandwest,respectively.Intheverticaldirection,thesurfaceisupperboundary,andthelowerboundaryisbedrock.（2）EstablishmentofWulanbasinhydrogeologicalconceptualmodel.AccordingtotheWulanbasinhydrogeological,geologicalconditions
6、andtheactualflowfieldareusedtosimplifytheboundaryconditions.Thewesternandnortheasternboundariescouldbeconceptualizedasconfiningboundaryandtherestofthebordersaretheflowboundaries.Dulanlake,KekeSaltlakeandSaltlakearetheminimumbaseleveloferosion,andthereforetheyaregeneralizedasd
7、rainageboundary.Theupperboundaryiswatertableandthelowerboundaryisthewaterimpermeableboundary.Thebasinisaintermontaneriftbasin,anditshydrogeologicalstructuremeetsthetypicalcharacteristicsofartesian;piedmontalluvialfanaquifersgenerallyaresingle-structuregravelaquifers,buttothec
8、enterofbasinalluvial-lacustrinealluvialplain,theaquifersgraduallytra
