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：按普通人的理解,一艘船上的船长应该是船上知识最渊博、能力最强也最值得依赖的人,而引航员应该是熟悉港口每一个角落、操控船舶技艺出众的人,这两个人同时在驾驶台指挥驾驶台团队引领船舶理应万无一失。而实际情况却与此大相径庭,据某船东保赔协会所透露的统计数据显示,船舶碰撞和搁浅案例中,约50%发生在引航水域,平均每年所造成的损失大概在5000万美元,这足以值得人们对导致事故发生的原因进行深入的调查和分析。

简介：2月22日，宜昌海事局巴东海事处深入到巴东县5所学校，把安全课送进学校。今年开学第一节安全课，由巴东海事处副处长周传喜讲坚持“三不坐”、“三不上”，即不超载船、不坐农用船、不坐夜间船；雾大不上船、风大不上船、水大不上船，要求学生做安全信息员，发现客船超载了给海事叔叔打个电话。