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1、UILU-WRC-74-0088UNITSTREAMPOWERFORSEDIMENTRESEARCHREPORTNO.88TRANSPORTINNATURALRIVERSByCHIHTEDYANGandJOHNB.STALLILLINOISSTATEWATERSURVEYURBANA,ILLINOISUNIVERSITYOFILLINOISATURBANA-CHAMPAIGNWATERRESOURCESCENTERJULY1974WRCRESEARCHREPORTNO.88UNITSTREAMPOWERFORSEDIMENTTRANSPORTINNATUR
2、ALRIVERSbyChihTedYang,AssociateHydrologistandJohnB.Stall,Head,HydrologySectionIllinoisStateWaterSurveyUrbana,IllinoisFINALREPORTProjectNo.B-075-ILLUNITSTREAMPOWERFORSEDIMENTTRANSPORTINNATURALRIVERSJuly1,1972-June30,1974Theworkdescribedinthispublicationwassupportedbymatchingfundsof
3、theIllinoisStateWaterSurveyandtheU.S.DepartmentoftheInterior,asauthorizedunderTitle1oftheWaterResourcesResearchActof1964,P.L.88-379UNIVERSITYOFILLINOISWATERRESOURCESCENTER2535HydrosystemsLaboratoryUrbana,Illinois61801July1974ABSTRACTUNITSTREAMPOWERFORSEDIMENTTRANSPORTINNATURALRIVE
4、RSTherelationshipbetweenrateofsedimenttransportandrateofpotentialenergyexpend•iturehasbeenstudiedindetail.Unitstreampower,definedasthetimerateofpotentialenergyexpenditureperunitweightofwater,isshowntobethedominantfactorinthedeterminationoftotalsedimentconcentration.Basicconceptsin
5、fluidmechanicsandboundarylayertheoryareusedtoestablishtheflowconditionatincipientmotion.Twoequationsthatprovidesimpleanddirectcriteriaforincipientmotionarefound.Theseequationsareverifiedby153setsofdataindependentlycollectedbyeightinvestigators.Adimensionlessunitstreampowerequation
6、isfoundforthepredictionoftotalsedimentconcentrationforbothlaboratoryflumesandnaturalrivers.Thisequationnotonlyprovidesagoodestimationofthetotalsedimentconcentrationinanalluvialchannelbutalsocorrectlyreflectstheeffectsofthevariationsofparticlesize,waterdepth,andwatertemperatureonto
7、talsedimentconcentration.Datacollectedfromsixnaturalriversandmorethanonethousandsetsoflaboratorydataareusedinsupportingthisequation.Datacollectedfrom17regulargagingstationsonnaturalriversalsoindicatethatunitstreampowerdominatestherateofsedimenttrans•port.REFERENCE:Yang,ChihTed,and
8、Stall,JohnB.,UNITSTREAMPOWERFORSE
