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                     Effectsoficefloodandsummerflooddiversionfrom theYellowRiveronecological
                           patternandwaterconsumptioninthenorthernmarginofHobqDesert

                                                    1,2
                                                                 1,2
                                          WANGJun ,LIJiankun ,MIAOPing        3
                           (1.InstituteofWaterResourcesinPastoralAreas,MinistryofWaterResources,Hohhot 010020,China;
                            2.YinshanbeiluNationalFieldResearchStationofSteppeEco - hydrologicalSystem,ChinaInstituteof
                                      WaterResourcesandHydropowerResearch,Beijing 100038,China;
                                         3.OrdosWaterResourcesBureau,Ordos 017010,China)

                  Abstract:InordertorelievethepressureoficefloodcandsummerfloodontrolinJiziwanoftheYellowRiver,the
                  icefloodsandsummerfloodweredivertedintothenorthernmarginofHobqDesert.Theecologicalpatternofthe
                  underlying surface changed , and the regionalhydrologicalcycle was also affected, especially the water
                  consumptionprocessoftheunderlyingsurface.Inordertodeeplyclarifytheecologicalpatternandthedrivingfac
                  torsofwaterconsumptionchangeinthenorthernmarginofHobqDesert ,thispaperanalyzedtheevolutioncharac
                  teristicsofecologicalpatternbeforeandafterwatertransferusingGFimages.Thespatio - temporalvariationmecha
                  nism ofregionalwaterconsumptionwaselaboratedbyusingremotesensingevapotranspirationcouplingtheory ,and
                  thecorrelationdegreebetweenmeteorologicalfactors (temperature,rainfall,humidityandwindspeed)andre
                  gionalwaterconsumptionwasfurtherevaluatedunderthisbackground.Theresultsshowthat :(1)theiceflood
                  andsummerfloodoftheYellowRiversignificantlyaffectedtheecologicalpatternofthenorthernmarginofHobq
                  Desert.Afterwatertransfer,theproportionofsandylandareadecreasedfrom72.5% to15.8%,andtheproportion
                  oflakeandwetlandareaincreasedfromzeroto27.5% and4.5%,respectively.(2)Theerrorsoflandsurfacee
                  vapotranspirationandwatersurfaceevaporationcalculatedbasedontheMETRICmodelandDaltonevaporationthe
                  oryare9.2% and9.3%,respectively.Theresultsofregionalwaterconsumptionhavehighreliability.Beforewater
                  transfer (2013),atthebeginningofwatertransfer(2016)andafterwatertransfer(2020),theaverageevapo
                  transpirationincropgrowingseason(April - October)was156.22mm,231.12mmand528.58mm,respectively,
                  andtheinfluenceofwatertransferonregionalwaterconsumptioncontinuedtoincreaseduringtransitseason.(3)
                  TheicefloodandsummerfloodoftheYellowRiverchangedthecorrelationbetweenevapotranspirationandmeteoro
                  logical factors (temperature, rainfall, wind speed, humidity). The positive correlation between
                  evapotranspirationandtemperatureandhumiditycontinuedtoincrease ,andtheproportionofpositivecorrelation
                  areasincreasedfrom73% and28% beforewatertransferto95% and76%,respectively.
                  Keywords: evapotranspiration; ecological pattern; meteorological factor; Hobq Desert; ice flood and
                  summerflood


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