Page 109 - 2024年第22卷第1期
P. 109
ducingenergyconsumptionareofgreatsignificancetothenationaleconomy.Inordertoreasonablyselectthecom
binationmodeofpumpunitsunderdifferentworkingconditionsandrealizetheoperationoptimizationofsingle - stage
pumpstation ,themathematicalmodelofpumpstationenergyconsumptionoptimizationisestablishedbyanalyzing
thepumpoperationcharacteristicsandpipelinelosscharacteristics.Thedynamicprogrammingmethodisusedto
determinetheconstraintconditionsandrecursiveequationswiththelowesttotalenergyconsumptionofpumpstation
astheobjectivefunction.TheMATLABdynamicprogrammingprogramiswrittentosolvethemodelandcalculate
theoptimalstartingcombination.TakingtheNo.5pumpingstationoftheShaanxi - Gansu - NingxiaYanhuanding
YellowRiverIrrigationastheresearchobject ,thecalculationresultsshowthatthedynamicprogrammingmethod
andthecomputerlanguagecanquicklyandaccuratelyfindtheoptimalstart - upcombinationamongallthepump
start - upcombinationsundersatisfactoryconstraintconditions ,reducetheenergyconsumptionofthepumpingsta
tionandimprovetheoperationefficiencyofthepumpingstation.Theestablishedmathematicalmodelhasstrong
practicabilityanduniversality ,whichcanprovideoptimaldecisionfortheoperationofthepumpstation,andhas
certainguidingsignificanceandapplicationvalueforimprovingtheeconomicbenefitsofthepumpstation.
Keywords:Yanhuanding;cascadepumpingstations;dynamicprogramming;stationcombination;minimumen
ergyconsumption
(责任编辑:王学凤)
(上接第 96页)
Spatial - temporaldynamicchangesoflanduseandecologicaleffectsinSongliaoBasin
2
1
1
XINGYanchun,NINGKe,LIXuelan
(1.SchoolofStatistics,JiLinUniversityofFinanceandEconomics,Changchun 130117,China;
2.TheEngineering&TechnicalCollege,ChengduUniversityofTechnology,Leshan 614000,China)
Abstract:Atpresent,Chinaattachesgreatimportancetotheconstructionofecologicalcivilizationbasedonthe
riverbasin.Timelyandeffectiveassessmentofthetemporalandspatialchangesoftheecologicalenvironment
qualityoftheriverbasinandanalyzingitsdrivingfactorsareveryimportantforformulatingthecooperativepro
tectionandtheconstructionofecologicalcivilizationbasedontheriverbasin.Thispaperusesprincipalcompo
nentanalysistoestablishtheecologicalenvironmentassessmentmodeloftheSongliaoRiverbasinbasedonthe
fourindicatorsofgreennessindex ,humidityindex,drynessindexandheatindexobtainedbyremotesensing
productswithdataasthekeyelement ,andexploresthechangesandcausesofecologicalenvironmentquality.
Theresultsshowthat :(1)TheecologicalenvironmentqualityoftheSongliaoRiverbasinisexcellentoverall,
showingthespatialdistributionof“beingexcellentinthenortheastandpoorinthesouthwest”.(2)From2000
to2020 ,theecologicalqualityoftheSongliaoRiverbasinhasgenerallyimproved.Theecologicalqualityhas
beengreatlyimprovedinthefirstdecade ,andtheseconddecadeisinthestageofecologicalprotectionandma
intenance.(3)From theperspectiveofspatialdistribution,theareawithpoorecologicalgradeandbelowsig
nificantlyshrank ,andtheareawithexcellentgradeexpandedoutward.(4)Humansocio - economicproduction
activitiesplayacrucialroleinthequalityassessmentofecologicalenvironment.Howtobalancetherelationship
betweensocio - economicproductionandecologicalenvironmentalprotectionisthekeytohelpingecologicalen
vironmentrestoration.
Keywords:ecologicalenvironmentassessment;remotesensingecologicalindex;PCA;remotesensingdata;
SongliaoRiverBasin;landuseandlandcoverchange
(责任编辑:王学凤)
— 1 0 7 —