简介:TheenvironmentalconditionsaroundthefirstoffshoreHZ21-1steelwellheadplatformintheSouthChinaSeaarecharacterizedbydeepwater,frequenttyphoons,roughwaves,highwatertemperature,severelycorrosiveseawater,andthickfoulingorganismattachments.Thedesignandeffectivenessofgalvanicanodeprotectionsystemarepresented,andseveralmethodsaredescribed,whicharethecalculationmethodoftheprotectivecurrentdensityconsideringthevariationofwaterdepth,themethodofdeterminingprotectionparametersconsideringvariousfactors,thearrangementofanodesbasedonpotentialdistributionandcurrentrequirementsatdifferentwaterdepths,andthemethodofanodeinstallation.Finallytheeffectoftheaccuracyofselectedcathodicprotectionparametersontheeconomicbenefitsofoffshoreprojectsisalsodiscussed..
简介:
简介:
简介:一、地震基本参数表1 地震基本参数表发震时间年月日时分秒震 中 位 置微 观宏 观东经北纬东经北纬参考地名震级(ML)震源深度(Km)震中烈度 地震类型 199604211341391118°40′26°22′118°41′26°22′闽清湾口417Ⅴ水库诱发地震 现场调查所确定的宏观震中位于闽清湾口前洋村附近(见图22-1),与微观震中基本吻合,仅有2公里的误差。二、地震烈度分布自1993年3月底水口水库开始蓄水,5月份起就有诱发地震发生,后逐渐频繁,且震级加大。本次41级地震是震级最高的一次地震。经过现场考察,绘制出地震烈度分布图(图22-1)。图22-1 水口库区41级地震烈度分布示意
简介:表面降雨过程并且日报与热带海洋的传送对流联系的变化被从一系列二维的解决云的模拟基于时时带平均数的数据分析一个表面降雨方程和热预算检验。模型是综合的因为有从热带海洋全球空气获得的强加的大规模垂直速度,带的风,和水平移流的21天在控制实验联合了海洋空气反应实验(宽外袍COARE)。日报分析表演在日落,以及移流的冷却以后的红外线的放射的冷却与强加的大规模上升运动联系了,使动摇空气和版本给与能量夜的对流开发的对流可得到的势能。实质的本地人大气的弄干在清早与夜的降雨山峰被联系,它在蒸汽预算是大冷凝作用和免职率的结果。敏感实验显示出那日报放射和大规模强迫罐头的变化生产一座夜的降雨山峰通过红外线、移流分别地冷却。
简介:
简介:Thedaily1°×1°dataoftheAviation(AVN)model,theblackbodytemperature(TBB)dataofcloudtop,andcloudimagesbygeostationarymeteorologicalsatellite(GMS)areusedtoidentifyadew-pointfrontneartheperipheryofthewesternPacificsubtropicalhigh(WPSH).Theresultsclearlydemonstratetheexistenceofthedew-pointfront,anditsthermodynamicanddynamicstructuralcharacteristicsareanalyzedindetail.Thedew-pointfrontisatransitionalbeltbetweenthemoistsouthwestmonsoonflowandthedryadiabaticsinkingflowneartheWPSH,manifestedbyalargehorizontalmoisturegradientinthemid-lowertroposphereandconjugatedwiththemei-yufronttoformapredominantdouble-frontstructureassociatedwithintenserainfallinthemei-yuperiod.Themei-yufrontislocatedbetween30°and35°N,verticallyextendsfromthegroundleveltotheupperlevelandshiftsnorthward.Thedew-pointfrontistothesouthofthemei-ynfrontandliesupagainsttheperipheryoftheWPSH.Generally,itislocatedbetween850hPaand500hPa.Onthedew-pointfrontside,thesouthwesterlyprevailsatthelowerlevelandthenortheasterlyattheupperlevel;thiswinddistributionisdifferentfromthatonthemei-yufrontside.Verticalascendingmotionexistsbetweenthetwofronts,andtherearedescendingmotionsonthenorthsideofthemei-yufrontandonthesouthsideofthedew-pointfront,whichformasecondarycirculation.Thedynamicsofthedoublefrontsalsohavesomeinterestingfeatures.Atthelowerlevel,positiveverticalvorticityandobviousconvergencebetweenthetwofrontsareclearlyidentified.Atthemid-lowerlevel,negativelocalchangeofthedivergence(correspondingtoincreasingconvergence)isoftenembeddedinthetwofrontsoragainstthemei-yufront.Mostcloudclustersoccurbetweenthetwofrontsandpropagatedownstreaminawave-likemanner.