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                     Impactassessmentofthermal - dischargefrom powerplantsbasedoncombinationof
                                      numericalsimulationandprototypeobservation

                                 CHENXiaoli,DUANYafei,ZHAOYijun,JIPing,YUANJue
                        (DepartmentofHydraulics,ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100038,China)


                  Abstract:Separationofthenaturalinhomogeneousbackgroundfromtheobservedtemperaturefieldiscrucialinthe
                  postevaluationofthermaldischargeimpact.Inthispaper ,aheattransportmodel,basedonthemultiplenested
                  gridtechnology,isconstructedtosimulatetheseawatertemperaturevariationincrossscalesunderthecombined
                  actionofthehydrologicandatmosphericfactors.Combinedwiththetide ,current,andremoteseasurfacetemper
                  aturedata ,amethodisproposedtoextractthethermaldischargeimpactfrom theinhomogeneousbackgroundand
                  appliedtothepostevaluationofthermalimpactofacoastalnuclearpowerplant.Theproposedmodelandevalua
                  tionmethodshowgoodperformanceindescribingthecharacteristicsofthethermalplumeandthenaturalback
                  groundhigh - temperaturemassdrivenbythecomplexmarineandmeteorologicaldynamics.Thenearshoreback
                  groundtemperatureshowsasimilartemporalandspatialvariationrangewiththe1℃ temperaturerisingareacaused
                  bythethermaldischarge.Theinhomogeneityofthebackgroundshouldbefullyconsideredintheassessmentsofthe
                  thermaldischargeinthe1℃ risingscale.Theproposedsimulationandevaluationmethodcansupporteco - environ
                  mentalimpactassessmentsofthermaldischargefromthermalpowerplantsundercomplexenvironmentalconditions.
                  Keywords:coolingwater;numericalsimulation;backgroundtemperature;transportanddiffusion;postevalua
                  tion


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