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1.
Forthepurposesoffloodcontrol,conveyanceofsediment,andadequateutilizationofwaterresourcesintheLowerYellowRiver,theoperationschemeofsedimentregulationonperennialbasisisproposedfortheXiaolangdiReservoi.Waterandsedimentareretainedinthereserviorinnormalandlowwateryears,whileinyearswithabundanceofwater,theyareflushedoutinshortperiodsofreservoirdrawdowntoformhyperconcentratedfloods.TheseremouldthewideshallowreachaboveGaocunintoanarrowdeepchannel,throughwhichthesedimentmaybetransportedallthewaytothesea.Theresults  相似文献   

2.
RIPRAPSTABILITYONSTEEPSLOPESHowardH.CHANG1ABSTRACTSteepchannelslopesareoftenlinedwithriprapasaprotectionagainstpotentialerosi...  相似文献   

3.
1INTRODUCTIONHumanactivitiesmayinducesignificantchangesinsedimenttransportcapacityofaluvialriverchannelsandcausechangesinthe...  相似文献   

4.
Onthebasisofpreviousresearchandpractice,anewmodelsandBZYhasbeensuccessfullydeveloped.Experimentshavebeencarriedoutonitsproperties,includingunitweight,initiationvelocity,settlingvelocity,reposeangle,etc.TheexperimentsshowthattheBZYmodelsandhasmanymeritsoverothers,suchasadjustableunitweight,widerangeofparticlesize,particleshapesimilartonaturalsandandstablephysicalandchemicalproperties.Thusithashighvalueforstudy,developmentandextensionforapplication.Stillsomeofitspropertiesneedtobefurtherstudied  相似文献   

5.
TheMarkVlietriversystemtransportsbedmaterialandpollutedsuspendedsedimentstotheVolkerakZoomlake,awaterenvironmentofhighlimnologicalvalue.Toprotecttheliving,workingandrecreationareasinthiscatchment,aproperintegratedwatermanagementisessential.Asystematiccontrolandsanitationofthepollutedsedimentsintheriverenvironmentwillhelptostopfurtherdegradationofthewaterecosystemquality.Therefore,atransboundarycollaborationbetweenBelgianandDutchauthoritiesissetuptostudyandsanitatethisinterregionalrivercatchment.Toimprove  相似文献   

6.
Theproblemofpierscouringhasbeenstudiedbymanyinvestigatorsduetoitsimportanceinbridgepierfoundationdesign.Acriticalreviewoftheuptodateworkonpierscouringhasbeenpresentedhighlightingthescourmechanism,parametersaffectingscour,timedependentscour,scourestimationformulasandprotectionworks  相似文献   

7.
Presentaddress:SouthCaliforniaUniversity,USA.ContributionNo.93A0032,InstituteofGeophysics,SSB,China.andstationareseparate,supposingarandomandhomogeneousdistributionofthescattersinathree-dimensionalinfiniteandperfectlyelasticmedium.TheenergydensityatadistanceofrisgivenasE(r,t|ω)=[W0(ω)g0(ω)]/(4πr2).K(vt/r).exp(-ωQc-1t)vt>r(2)WhereK(x)=(1/x)ln[(x+1)/(x-1)],andg0(ω)isthetotalscatteringcoefficientcharacterizingascatteringpowerperunitvolumeofthehomogeneousmedium.Comparisonofvariousobservationsincludingcodadecay  相似文献   

8.
Thisbibliographyonpierscouringcoversaperiodfrom1873to1996includingover300references.Althoughtheemphasisinthisbibliographyisonpierscouringassociatedwithmechanismofscour,parametersaffectingscour,timedependentscour,designformulas,modelingandprotectionworks;complementarystudiesonhorseshoevortexatpiersorcylindersarealsoincluded  相似文献   

9.
HistoricalseismicityofSouthChinafromEuropeansources:exampleoftheHongKongNewspaperPressR.M.W.MUSSON(BritishGeologicalSurvey,We...  相似文献   

10.
[BriefNews]:AnMs=7.3earthquakeoccurredinthesouthernAnMs=7.3earthquakeoccurredinthesouthernpartoftheTaiwanStrait(22.6°N,118.7°...  相似文献   

11.
Riverswithheterogeneousbedsedimentstypicallyshowasystematicdownstreamvariationincharacteristicgrainsizewhensubjectedtoaggradationordegradation.Recentlytheauthorsreportedonadecouplednumericalmodelbasedontheassumptionofnonuniformflowwhichreproducedtheresultsofasetofexperimentsongrainsorting.Thesameexperimentscanalsobereproducedusinganumericalmodelforwhichmuchoftheflowdomainisapproximatedasquasinormal.Thekeytothissimplificationistheuseofshockfittingtolocatethedownstreamfrontofgravelaggradation.Oncetheshockha  相似文献   

12.
ThesourcerupturefeatureofthesouthernTaiwanStraitsearthquakeofSeptember16,1994(Ms7.3)&theanalysisofearthquakecircumstanceinsou...  相似文献   

13.
INDEXofVo1.11,1996¥//1.SoilerosionandsedimentyieldinuplandComparisonofsedimentdischargepredictionsforsmallwatershedsinthesout...  相似文献   

14.
ContributorstothisissueRuo-BaiWANG(王若柏)SeniorEngineer,GraduatedfromBeijingGeologicalCollegein1968.ReceivedM.S.degreefromPostg...  相似文献   

15.
ContributorstothisissueQin-ZuLI(李钦祖)GraduatedfromDepartmentofGeophysics,PekingUniversityin1962.ResearchProfessorofGeophysicsa...  相似文献   

16.
THEROLEPLAYEDBYWASHLOADDEPOSITIONINTHEFORMATIONOFDIFFERENTRIVERPATTERNSThelowerlayerofthebedmaterialconsistsoftinesandandtheupperlayerconsistsofamixtureofclay(10%)andtinesand(90%).NATURALRIVERSl.ChangeofchannelpatternsalongarivercourseItiscommonthatintheupperPartofanalluvialriverthelongitudinalslopeissteepandtherivercarriesheavysedimentload.Duetothesteepslopeandassociatedhighvelocityclaysettleslittleevenontloodplain.Floodplainorriverhankconsistsofsiltandtinesand.Theriverbehavesasawanderingone.Passingacert  相似文献   

17.
ContributorstothisisueZHI┐QIANGHAN(韩志强)ResearchAssistantofInstituteofGeophysics,StateSeismologicalBureau.GraduatedfromtheDepa...  相似文献   

18.
SEDIMENTATIONINLOWHEADRIVERRESERVOIRS¥WilhelmBechteler(Prof.Dr.-Iug.InstituteofHydrosciences,FederalArmedForcesUniversityMuni...  相似文献   

19.
Elastic wave propagation in inhomogeneous anisotropic media   总被引:1,自引:0,他引:1  
IntroductionThemediaineartharequitecomplex.Thereexistseveraluncontinuousplains.Normaly,itisusedtoapproximaterealmediumwithlay...  相似文献   

20.
NOTESFORCONTRIBUTOROriginalpaceshould'besubndttedintripheatetotheMitonalHoardoftheJournal.Onlyoriginalpapersedbeaccepted,andc...  相似文献   

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