ADCP对悬浮沉积物浓度的测量及其误差分析研究

20EXPERIMENT&TECHNOLOGYADCP兰志刚,龚德俊,李思忍,徐永平,秦枫,姜静波(,266071):为实时连续地测量海水中悬浮沉积物,利用声学多普勒海流剖面仪(ADCP),可以在测流的同时,测量海洋悬浮沉积物浓度描述了利用后散射强度,估计悬浮沉积物浓度的原理在现场测试中,利用采水器采集水样,通过水样分析并结合声信号的衰减特征对ADCP的测量结果进行修正作者还结合现场测试结果,对这一测量方法的精度进行了分析现场实验表明,经公式校正后,ADCP测得的后散射强度与实测水样所获得的悬浮沉积物浓度之间有很好的相关性,相关系数达0.88,由此证明,此测量方法具有很好的实用价值和应用前景:(ADCP);;;:P736.21:A:1000-3096(2004)10-0020-04,2080[1,2],Libicki[3]1989;Thorne[4~6]90,,(ADCP),[7];Deines[8]1999,ADCP,,ADCP;,,3:(1),ADCP(2)ADCP(3)ADCP1测量原理:[4~6]ADCP,,,[9],:Es=(E-Er)+20lg(RW)+2AtR+C(1)(1)Es,EADCP,Er;R;C:2003-12-12;:2004-08-06:(H42032602);(L84032609);(2002-2003):(1963-),,,,,,:0532-2898736,E-mail:[e-mail]/2004/28/10EXPERIMENT&TECHNOLOGY21MarineSciences/Vol.28,No.10/2004EXPERIMENT&TECHNOLOGY22;Er,ADCP1,,0.881ADCPFig.1AcousticbackscatteringfromADCPvs.suspendedsedimentconcentrationfromsamplingbottle2ADCPFig.2ErrorofsuspendedsedimentconcentrationmeasurementfromADCP4测量的误差分析ADCPY=10lg(M)=AEs+BM=10lg(Y/10),ADCP:268%,1200kHzADCP15mg/L120mg/L,25%,,,,,,,,,,,5结论ADCP,,,,ADCP,,,,,,:[1]HessFR,BedfordKW.Acousticbackscattersystem(ABSS):Theinstrumentandsomepreliminaryresults[J].MarineGeology,1985,66:357-380.[2]LynchJF.TheoreticalanalysisofABSSdataforHEBBLE[J].MarineGeology,1985,66:277-289.[3]LibickiC,BedfordKW,LynchJF.Theinterpretationandevaluationofa3-mHzacousticbackscatterdeviceformeasuringbenthicboundarylayersedimentdynamics[J].JAcoustSocAm,1989,85(4):1501-1511.[4]ThornePD,VincentCE,HardcastlePJ,etal,Mea2suringsuspendedsedimentconcentrationsusingacousticbackscatterdevices[J].MarineGeology,1991,98(1):/2004/28/10EXPERIMENT&TECHNOLOGY237-16.[5]ThornePD,CampbellSC.Backscatteringbyasuspensionofspheres[J].JAcoustSocAm,1992,92(2):976-986.[6]ThornePD,HanesDM.Areviewofacousticmeasurementofsmall-scalesedimentprocesses[J].Continentalshelfresearch,2002,22:603-632.[7]JonesSE,JagoCF,PrandleD,etal.Suspendedsedimentdynamics:measurementandmodelinginthedoverstrait[A].BevenKJ,ChatwinPC,MillbankJH.MixingandTrans2portintheEnvironment[C].NewYork:Wiley.183-201.[8]DeinesKL.BackscatterestimationusingbroadbandAcousticDopplerCurrentProfilers[R].SanDiegoUSA:RDInstruments,1999.[9]UrickRJ.Principleofunderwatersound[M].NewYork:Mcgraw-HillBookCo,1983.1-95.[10]FisherFH,SimmonsVP.Soundabsorptioninseawater[J].JAcoustSocAm,1977,62:558-564.[11]HayAE.Soundscatteringfromaparticle-ladenjet[J].JAcoustSocAm,1991,90:2055-2074.[12]HayAE,ShengJ.Verticalprofilesofsuspendedsandconcentrationandsizefrommultifrequencyacousticbackscatter[J].JournalofGeophysicalResearch,1992,97(C10):15661-15667.[13]DowningA,ThornePD,VincentCE.Backscatteringfromasuspensioninnearfieldofapistontransducer[J].JAcoustSocAm,1995,97(3):1614-1620.[14]AlvarezLG,JonesSE.FactorsinfluencingsuspendedsedimentfluxintheupperGulfofCaliforniaEstuarine[J].CoastalandShelfScience,2002,54:747-759.AcousticmeasurementofsuspendedsedimentswithADCPanditserroranalysisLANZhi-gang,GONGDe-jun,LISi-ren,XUYong-ping,QINFeng,JIANGJing-bo(InstituteofOceanology,theChineseAcademyofSciences,Qingdao266071,China)Received:Dec.,12,2003Keywords:acoustccdopplercurrentprofiler(ADCP);suspendedsediment;linearfitting;acousticbackscatteringAbstract:Besidescurrentvelocitymeasurements,theacousticbackscatteringsignalsimultaneouslymeasuredbyADCPcanbeusedforinversionofsuspendedsedimentconcentration.Therefore,achievethegoaltogreatlyimprovethetemporalandspatialresolutionofthemeasurementcanbegreatlyimproved.TheprincipleofestimatingsuspendedsedimentconcentrationfromacousticbackscatteringmeasuredbyADCPwasinterpretedindetailanderroranalysiswasmadeforthemeasurementsinthispaper.In-situwatersamplingwasappliedtocorrectthemeasurementsofsuspendedsedimentcon2centrationfromADCP,andagoodcorrelation(0.88)wasshownbetweensuspendedsedimentconcentrationandacousticbackscattering.Verificationfromin-situmeasurementsprovedtheapplicationandeffectivenessofthetechnique.(本文编辑:刘珊珊)MarineSciences/Vol.28,No.10/2004