Page 73 - 《水资源与水工程学报》2022年第6期
P. 73
! 33 " ! 6 # & ' ( ) & * + , - Vol.33No.6
2022 $ 12 % JournalofWaterResources&WaterEngineering Dec.,2022
DOI:10.11705/j.issn.1672-643X.2022.06.09
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KLDMN:TV121 .4;P333 OPQRS:A OTUN:1672643X(2022)06006908
WPT-HPO-ELM multisteprunoffforecastmodel
1
XUJianwei,CUIDongwen 2
(1.YunnanInstituteofWater&HydropowerEngineeringInvestigation,DesignandResearch,Kunming650021,China;
2.WenshanPrefectureWaterBureauofYunnanProvince,Wenshan663000,China)
Abstract:Toimprovethemultistepforecastaccuracyofrunofftimeseries,anovelmodelwasestab
lishedcombiningwaveletpackettransform(WPT),hunter-preyoptimization(HPO)algorithmandex
tremelearningmachine (ELM),whichwasthenappliedtothemulti-stepforecastofmonthlyanddaily
runofftimeseriesoftheNankangRiverHydrologicalStationinYunnanProvince.TheprincipleofHPO
algorithmisintroduced ,and6typicalfunctionsareselectedtosimulateandverifyHPOunderdifferent
dimensionalconditions.Thenthedataofrunofftimeseriesisdecomposedinto4subsequencecomponents
usingdoublelayerWPT,soastoreducethecomplexityandinstabilityoftherunoffsequencedata.The
ELMinputlayerweightsandhiddenlayerbiasesareoptimizedtoestablishaWPT-HPO-ELM model
forthepredictionofmonthlyanddailyrunoffinmultiplesteps.TheresultsshowthattheHPOalgorithm
hasgoodoptimizationaccuracyandglobalsearchability ;theWPT-HPO-ELMmodelperformsideally
attheforecastof1-3monthsmonthlyrunoff,withthemeanabsolutepercentageerror ≤2.43%,the
passrate ≥99.2% ,andthecoefficientofcertainty ≥0.999;itcanalsopresentasatisfactoryresultat
theforecastofthemonthlyrunoffwithaforecastperiodof4-6months ,withthemeanabsolutepercent
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