bottom mearsered pulse to pulse

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1、BOTTOMCURRENTSMEASUREDWITHAPULSE-TO-PULSECOHERENTSONARBruceHackett,AtleLohrmann,andLarsPetterR0edVeritasOffshoreTechnologyandServicesAISP.0.Box300,N-1322Hsvik.Norway(ADCPs).Thetechnique,whichavoidsthelimitingTheperformanceofaHighResolutionCurrentProfiler(HRCP)constraintsoftheDopplertechnique

2、,isdescribedusingpulse-to-pulsecoherentDopplertechniqueratherthaninsomedetailtogetherwiththeinstrumentationconventionalincoherentDoppler(ADCP)techniqueisdiscussed.usedinBSEXinSection2.TheHXCP(300KHz)wasdeployedonthebottomoftheNorthSea(atabout100mdepth)lookingupwards.ThesensorheadwasTheHRCPwa

3、sdeployedinthenorthernNorthSeaindep!oyedseparatelyformtheelectronicsandcomnunicationwasthesummerof1986asdiscussedinSection3,achievedbycable.ThemainframeholdstheHRCPelectronics,whichalsodescribesthesamplingstrategy.ThetheDataAcquisitionSystem,anADCPandaCTD.Thesamplingdatawerelatertransferredt

4、oamainframerateoftheHRCPwassetto4Hzanddatawerecollectedforcomputerandanalyzedwithrespecttobottomabout50hoursin50cellseach20cmlong.frictionparameterssuchasshearvelocity,bottomTheHRCPgavesatisfactoryresultswithhorizontalvelocitiesroughness'etc.TheperformanceoftheHRCPisofshortterm(order1s)preci

5、sionof0.5cm/sorbetter.discussedinSection4withrespecttodataMostoftheproblemswithHRCPsseemtobelinkedtotheharvest,quality,etc.,whileSection5presentsexistenceofhighbackscatteringlayersintheoceanreducingtheanalysis.FinallySection6offersabrieftheharvestofgooddatatoabout75%.Shearvelocitiesinthedisc

6、ussionandsomefinalremarks.range0.4to0.9unIsandroughnesslengthsoforder1cmwerefound.Thesevaluesarecomparabletothosefoundoffthe2.DESCRIPTIONOFTHEINSTRUMENTATIONnorthernCaliforniaShelfduringCODE-1.2.1TheCurrentMeasuringSystem1.INTRODUCTIONTheHRCPispartofaninstrumentationsystemTheperformanceofahi

7、ghresolutioncurrentcalledtheCurrentMeasuringSystem(CMS).TheCMSprofiler(HRCP),developedandusedwithinthehasbeendevelopedbyRDInstruments,U.S.A.andindustryfundedresearchprojectBottomStressDetnorskeVeritas,Norway.ItconsistsoffourExperiment(BSEX),isconsi