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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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