滴灌用砂过滤器的过滤与反冲洗性能试验研究

199712SHUILIXUEBAO12X(),,,,,,,.,,,,,,.,(),.,.,.,,(),,.()CDRe,Re=ul,,,u,u=0,l,,l=0d6(1-0)[1],ReRe=d6(1-0).27X1996320.©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=CD6(1-0)2g30dLCDCD=g30d6(1-0)2HL.0=0142=0182de=0100059m,L=013m[2],CDRe1,CD:CD=2145Re0148.(Re=110510)(1)1ReCDQ(m3/h)2345678910-3(m/s)615917131016121915221726102912H(m)01310158019111251171211821693123Re01981137118421292176312131674113CD2152211118111651151140113111242Q(m3/h)123456789(10-3m/s)3125615917131016121915221726102912H(m)01101310158019111291171211821673123H=200g2d2(1-0)230L(m)01301771115115411922131217031083147P1=H-HH100(%)2001489069493524157H=01178CD2gd140L(m)012501560189112511642105214921943141P2=H-HH100(%)150805337272014106H=36kg2d(1-0)230L(m)013501691104113911732108214321783112P3=H-HH100(%)25012279535422114-4H=34174014811520148g1148d1148(1-0)114830L(m)011101320139019211281170211421633114P4=H-HH100(%)10312117011214-016-118-212-218()Re(1)CD=2145601480148(1-0)014801480148d01480148,CDH=3417401481152(1-0)11480148g1148d114830L.(2)37©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=1000kg/m3,=01001Ns/m2,g=9181m/s2,0deLH=6751651152.,,(Leva)2(FairHatch)[3]2(Blake2Kozeny)(2).()11,.013mm,31/6,01045mm.21de=0100059m0=0142=0182L=013m,S0=6(1-0)Lde=2158m2.,,.31[5],,,,.(),1,.1,tC,dx,C+5c5xdx,(,);dt,C+5c5tdt,(C+5c5xdx)+55t(C+5c5xdx)dt,C+5c5xdx+5c5tdt,+55tdt.dt,dtdx,[C-(C+5c5xdx+5c5tdt)]dt=[(+55tdt)-]dt.dt2,dxdtu,u=0-,,:55t=-5C5x.(3)47©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()24210cm.20415415121012102710271042104,,,,,.10h,0415cm11=0108,4151210cm21=01055,1210cm.,50h12=01135,22=01113,(12102710cm)32=0107,.120h,15=01225,25=01170,35=01125,(27104210cm),45=01058.,,,80h,1134,1156,415;,10.,,,10h,01210cm,80h,27104210cm,02710cm.,,,;,,.,,,,.(),,,.,.,,,,.,,.()a,LL0,,e=L0-LL.d=013-110mm,:57©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=12126d1131(e+0)21310154(1-0)0154(1+e)1177,(m/s)(4)a,e,.,.11d=013110mm,110mm,110mme=0,,(4)am=12126(0182)1131(01001)1131(1+0142)2131(01001)0154(1-0142)0154(1+0)1177=010083m/s.,110mm,,em.de=0100059m(4)(em+0)2131(1+em)1177=0154(1-0)0154121261131d1131eam=0127,em=0125.213.,32,(Q=510m3/h,=0100173m/s)H6185m.1,,0(0-),(2)1,[1-(0-1)]1148(0-1)3=0148g1148d1148e3417401481152HL,:(1-0+1)1148(0-1)013=4122H.(5)(H=6185m)1=0114.am=010083m/s,,,33,31375m,(5),2=0108,am3,,110mm,.31,eD=014067©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.=0147,a=(0182)1131(0100059)1131(01001)0154(0147+0142)2131(1-0142)0154(1+0147)1177=01012m/s.41D=01012m/s,10min,,,115m,(5)3=01004,11%,,(34)(31),.(1).,.(2)de=0159mm0=0142=0182,Re110510,CD=2145Re0148,H=341740148115201481148(1-0)114830L.(3),,,,02710cm.(4)d=013110mm,D=01012m/s,eD=0147.1,,.,199211.2,.,19952.3[].,,199610.4,.,19857.5G1M1,J1C1.,,19777.Astudyonthefiltrationandbackflushingperformanceofthefilterswithcrushedquatzsandfordrip2irrigationDongWenchu(WuhanUniversityofHydraulicandElectricEngineering)AbstractStudyonfiltrationandbackflushingperformanceofthefilterswithcrushedquatzsandfordripirrigationhavebeenpresentedinthispaper.Aftergroundedontheoraticalanalysisandtestingre2sults,arelationshipbetweenresistancecoefficientoffiltrationandReynoldsnumberhavebeensug277©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(71)SimulationofinfiltrationandrechargebasedonfieldwaterbalanceincroppedsoilXuDiCaiLingen(ChinaInstituteofWaterResourcesandHydropowerResearch)AbstractThepaperpresentssomeinvestigationsconductedintheXiongCountyExperimentalSta2tion.Onthebasisofclimaticdataobservedinthefieldandcropparametersmeasuredintheplotareaaswellassoilhydraulicparametersestimatedfromlaboratoryandfieldexperiments,simulationonfieldwaterbalancewithconsiderationofactualsoilevaporationandrootextrac2tionundercroppedsoilduringthegrowingseasonofwinterwheatandsummermaizehasbeenrevealed.Thesimulationhasbeenusedtoquantifytherechargetogroundwateratadepthofthebottomboundaryof330cmandtodescribetheprocessesofrechargedistributionaswellasthecharacteristicsofseasonalchangeofgroundwaterlevel.Keywordsrecharge,waterbalance,rootextraction,hydraulichead,soilhydraulicproperties.87©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.