何继善教授从事地球物理工作60周年学术成就回顾_汤井田

23920139Vol.23No.9TheChineseJournalofNonferrousMetalsSep.20131004-0609(2013)09-2323-17601,21,21,21,21,2(1.4100832.410083)()1934196019941991~2001()(SEG)2nAAcademicachievementsofProfessorHEJi-shandedicatedtogeophysicsforsixdecadesTANGJing-tian1,2,DAIQian-wei1,2,LIUJian-xin1,2,ZHUZi-qiang1,2,LIDi-quan1,2(2.SchoolofGeosciencesandInfo-Physics,CentralSouthUniversity,Changsha410083,China;1.KeyLaboratoryofMetallogenicPredictionofNonferrousMetals,MinistryofEducation,CentralSouthUniversity,Changsha410083,China)Abstract:ProfessorHEJi-shanisafamousgeophysicist,educator,engineeringmanagementexpertandoneofthemasterswhoepitomizetheelectromagneticmethodsinChina.HewasborninLiuyangCounty,HunanProvincein1934,graduatedfromtheDepartmentofGeophysics,ChangchunCollegeofGeologyin1960.HewaselectedtobeanacademicianoftheChineseAcademyofEngineeringin1994.HeonceservedasthepresidentofCentralSouthUniversityofTechnology,thevicechairmanoftheNonferrousMetalsSocietyofChina,thevicepresidentofChineseGeophysicalSociety,thedirectorofEnergyandMineralEngineeringDivisionofChineseAcademyofEngineering,theChairmanofHunanAssociationforScienceandTechnology,andthechiefeditorofTheChineseJournalofNonferrousMetalsandTransactionsofNonferrousMetalsSocietyofChinafrom1991to2001.Currently,heisnotonlythehonorarychairmanofHunanAssociationforscienceandtechnology,butalsothefifthpresidiummemberandamember2013-05-162013-06-3013507317396E-mail:[e-mail]201392324oftheStandingCommitteeoftheDivisionofEngineeringManagementoftheChineseAcademyofEngineering,aswellasalifememberoftheSocietyofExplorationGeophysicists.ProfessorHEJi-shanhasbeeninvolvedinthegeophysicsresearchforalongtimetomakeremarkableacademicachievements.HecreatedtheDualFrequencyIPmethodandinventedtheDualFrequencyIPinstrument.Hehasnotjustproposedtheclosedadditioninathree-elementset,butachievedthefastrecursivecodingof2nSequencePseudo-RandomSignal,andestablishedtheelectricalsystembasedonPseudo-RandomSignalaswell.Moreover,hehasestablishedtheFlow-Fieldmethodwithhigh-resolutiontodetectthewaterinletofthepipingandseepageindykesanddams,whichprovidestheessentialtechnicalsupportandthescientificdecision-makingbasisofemergencyrestorationfordetectingthehiddendangersofdilapidatedreservoirsandinvestigatingthehazardsofembankmentsinfloodseason.Hehasunifiedthedefinitionandalgorithmoftheentirefieldresistivityofthefrequencydomainelectromagneticmethods,andcreatedtheWideFieldElectromagneticmethodtoopenupabrand-newresearchareafortheelectromagneticexploration.HehasalsocreatedthefirstnationalkeydisciplineofChina,whichfeaturesthegeo-electricfieldandobservationsystem.What’smore,ProfessorHEhasinventedaseriesofgeo-electricfieldobservationinstrumentsandequipmentswithinternationaladvancedlevelsandindependentintellectualpropertyrights,andmadesignificantcontributiontotheresourceexplorationandengineeringsurveydevelopmentofChina.TheexplorationgeophysicstheorysystemcharacterizedbythePseudo-RandomSignalElectromagneticmethodandDual-FrequencyIPmethodthatProfessorHEhascreatedanddeveloped,hasbeenhailedasamajoreventofappliedgeophysicsinternationally.HisstudyhasimportantguidingsignificanceonthedevelopmentofgeophysicsofChina.Keywords:HEJi-shan;geophysics;Dual-FrequencyIPmethod;pseudorandomsignal;flowfieldmethod;widefieldelectromagneticmethod11970[1]19781.11(a)ZW1′2′3′123W=f(z)f'(z)≠0ZRSW(1(b)(c))XAAVVMMVVNNVVAθlnπXAXAMNNMANVVNM(1)XAMNVXNMAVA(A′)MN(M'N')(1)2396023251Fig.1PrincipleofcoordinatetransformationmethodW1.245°23XSXAS1B400%200%1.34530°90%,245°Fig.2Theoreticalresultofcoordinatetransformationmethodwithinfinitelengthridgemodel(Slope=45°)345°Fig.3Theoreticalresultofcoordinatetransformationmethodwithfinitelengthridgemodel(Slope=45°)250%201392326430°Fig.4Experimentofcoordinatetransformationmethodwithridgemodel(Slope=30°)530°Fig.5Experimentofcoordinatetransformationmethodwithvalleymodel(Slope=30°)()5mm100mm200mm15mm5×510%22.119581960∆VH∆VH∆VH1∆VL∆VL∆VHLHsH100%VVFV(2)1)2)13)1/313s33100%3VVFV(3)∆V1∆V3239602327131/131970[2]1980[3−5][6]2.2(6)()∆V(fL)∆V(fH)(4)FsLHsL()()(%)100%()VfVfFVf(4)6Fig.6PrincipleofDual-frequencyIPmethod2013923282.3()IG(t)ID(t)D0D141sin(21)π21nIIntn(5)G0G141sin[(21)]π21nIIntn(6)I0ωG/ωD=sI=ID+IG0D141{sin[(21)π21nIIntnDsin(21)]}nst(7)sφ=0(7)(8)0DG4{sinsinπIIttDD11sin[(21)sin(21)]}21nntnstn(8)sφ=π(7)(9)0DG4{sinsinπIIttDD11sin[(21)sin(21)]}21nntnstn(9)sφ=0φ=π(7)(10)(11)ss0DG41{sinsinπsIIttsDDD111sin[(21)sin(21)]}sin21nntnststns(10)0DG41{sinsinπsIIttsDDD111sin[(21)sin(21)]}sin21nntnststns(11)φ=0φ=π(7)7(s=13φ=0)(a)(b)Fig.7WaveamplitudespectrumofsquarewaveandDual-frequencywave(s=13,φ=0):(a)Squarewave;(b)Dual-frequencywave2.48132396023291)2)3)AGADφGφGRGRDIGIDFs∆φ8Fig.8ObservationsystemofDual-frequencyIPmethodSQ-1SQ-2SQ-3SQ-3CSQ-5DQ-1000WSJ-3()2.51)91312/132)−12%−1.06%0.148%3)()9Fig.9Currentwaveformandamplitudespectrumofsquarewaveanddual-frequencywave2013923304)ηs=(∆V2/∆V)×100%ηs=2%∆V=50∆V21mV∆V50mV500Ω·mAB=1