简介:OnMarch26,2010anunderwaterexplosion(UWE)ledtothesinkingoftheROKSCheonan.TheofficialMultinationalCivilian-MilitaryJointInvestigationGroup(MCMJIG)reportconcludedthatthecauseoftheunderwaterexplosionwasa250kgnetexplosiveweight(NEW)detonationatadepthof69mfromaDPRK'CHT-02D'torpedo.KimandGitterman(2012a)determinedtheNEWandseismicmagnitudeas136kgatadepthofapproximately8mand2.04,respectivelyusingbasichydrodynamicsbasedontheoreticalandexperimentalmethodsaswellasspectralanalysisandseismicmethods.ThepurposeofthisstudywastoclarifythecauseoftheUWEviamoredetailedmethodsusingbubbledynamicsandsimulationofpropellersaswellasforensicseismology.Regardingtheobservedbubblepulseperiodof0.990s,0.976sand1.030swerefoundincaseofa136NEWatadetonationdepthof8musingtheboundaryelementmethod(BEM)and3Dbubbleshapesimulationsderivedfora136kgNEWdetonationatadepthof8mapproximately5mportsidefromthehullcenterline.Hereweshowthroughanalyticalequations,modelsand3Dbubbleshapesimulationsthatthemostprobablecauseofthisunderwaterexplosionwasa136kgNEWdetonationatadepthof8mattributabletoaROKlittoral'landcontrol'mine(LCM).
简介:我是1973年3月到交通部工作的,正值中国政府正式参与国际海事组织之际,恰逢国际海事组织公约生效14周年,组织上安排我从事与国际海事组织相关的工作。1975年,我首次出国执行任务,也是中国第一次参加国际海事组织B类理事的竞选。当时我国刚刚加入这个组织不久,别人并不了解中国,因为那时我国船舶数量不够多,贸易量也不够大,但有的国家的代表团还是表示,我们这次是专程来投中国票的。当投票结果出来以后,中国成功当选时,当时我的心情激动万分,高兴得说不出话来。1989年,我国竞选A类理事国,结果选上了,大会把目光投向了我们,我们成功了,这标志着我国的航运大国地位得到世界公认。