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ID:34017983
大小:11.11 MB
页数:82页
时间:2019-03-03
《北京地区冰雹云的微物理与电过程的数值模拟》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、AbstractABSTRACTInthispaper,inordertostudytheprocessesofmicrophysicsandelectrificationinhailstorm,Weuseda2-dimensional(2D)ThunderstormElectrificationandLightningModel(TELM)whichhasbeenimprovedtosimulate12hailstormsinBeijingandanalyzedthefollowingseveralaspects:(1)Givethestatisticsofcharacterist
2、icvaluesofdynamics,microphysicsandelectricityofsimulafionresultsof12casestudiesandanalyzedthepossiblerelationshipbetweenlightningfrequencyandhail-falling.(2)Throughtheanalysisofthechangingprocessofdynamics,microphysicsandelectricityofacasetodiscussphysicalmechanismsoftherelationshipsbetweenligh
3、tning疗equencyandhail—falling.(3)Throughacombinationoflightningdetectiondataandsimulationresultstoexamineandanalyzetherelationshipoflightningfrequencyandhail-falling.(4)Atlast,wewilldiscusstheinfluenceonthepolarity,occurrenceanddevelopmentoflightningbyconfigurationofelectricstructure.Themainrese
4、archresultsareasfollows:1.Notonlytheimprovednumericalmodelcouldsimulatethemacroandmicroprocessofhailstorm,butalsocouldsimulatetheelectrificationandlightningprocess.Theanalysisofthechangeprocessoflightningfrequencywithtimeduringthelifetimeofhailstormandhail.fallingshowsthat:thereisadistinctinten
5、siveincreaseinlightningfrequencyinthequicklydevelopingperiodofhailcloud.Therearefourcasesindicatethatthepeaklightning丘equencyOccurs8minutesearlierthanthetimeofhailstonefalling.ThereareelevencasesindicatethatthepeaklightningfrequencyOccurs8minutesearlierthanthetimeofmaximumhailstonefalling.2.The
6、analysisofthedynamic,microphysicsandelectrificationofcase040622showsthatthereasonwhythereisadistinctintensiveincreaseinlightningfrequencyinthequicklydevelopingperiodofhailcloudisthecombinedresultofdynamicalandmicrophysicalprocesses.Beforethedistinctintensiveincreasehappening,thewatercontentsofi
7、ceandgraupelparticlesalsoshowaintensiveincreaseandthecollisionspeedbetweenthemgrowsrapidly.Atthispoint,undertheactionofnon.inductivemechanism,theelectrificationprocessstrengthensrapidlywhichmakesthechargeconcentrate—ioninthecloudi
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