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GRACEsatellite - basedestimationofgroundwaterstoragechanges
andwaterbalanceanalysisfortheHaiheRiverBasin
1
1
1
2
1
LONGDi,YANGWenting,SUNZhangli,CUIYingjie,ZHANGCaijin,CUIYanhong 1
(1.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing 100084,China;
2.CollegeofEarthScience,ChengduUniversityofTechnology,Chengdu 610059,China)
Abstract:TheSouth - to - NorthWaterDiversionandreductionsingroundwaterwithdrawalshavechangedwater
supplyandusestructureandprofoundlyinfluencedgroundwaterstorage (GWS)intheHaihePlain(HP).Reliable
monitoringofregionalGWSchangesservesasabasisforwatersecurityandstrategicgroundwaterreserves.Here ,
wecomparedifferentmethodsofprocessingGRACEsignalsandusefourGRACEproductstoestimatechangesin
totalwaterstorage (TWS)intheHaiheRiverBasinandGWSintheHPfrom2003to2020.Impactofchangesin
TWSonevapotranspiration (ET)estimatesacrossthebasinisquantified.Resultsshowthatthecoefficientofdeter
minationofGWSchangesintheHPretrievedfromGRACEJPLMasconsdataishighestrelativetogroundmonito
ringdata.GWSintheHPgenerallyshowsadownwardtrendatthreedistinctstages,anddecliningratesfrom2003
3
3
to2011 ,2012to2015and2016to2020areestimatedtobe- 2.39±0.13km ?yr,- 7.55±0.53km ?yr,- 3.73±
3
0.26km ?yrbyGRACEJPLMasconsdata.Themulti - yearaverageET(521mm?yr)withoutconsideringchanges
3
inTWSdiffersbyupto10mm(3.2km ?yr)fromthemulti - yearaverageET(530mm?yr)consideringchangesin
TWS.Themaximum differenceinannualETwithandwithoutconsideringchangesinTWSisabout80mm?yr
3
(25km ?yr,2014).Thefindingsfrom thisstudyprovidethelatestunderstandingofchangesinGWSintheHP
overthepasttwodecades.
Keywords:GRACE; scaling factor; sphericalharmonics; Mascons; groundwaterstorage; waterbalance;
HaihePlain
(责任编辑:于福亮)
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