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ID:34159390
大小:1.40 MB
页数:15页
时间:2019-03-04
《volcanic hazards flow:火山灾害流》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、15VolcanicHazards:FlowThinkAboutItDatePageG23Page#·Howdovolcanoesaffectthebiosphere?15VolcanicHazards:FlowInvestigatePartADatePageG24Page#1.Whatistherelationshipbetweenthevolumeofaneruptionandthesizeoftheareaitcovers?3.MakeadatatableVolumeSurfaceArea(cm2)0.5cm31cm32cm34cm38cm316cm38a.Whateffe
2、ctdoestemperaturehaveonresistancetoflow(viscosity)?8b.Whathappenstofluidwhenslopechangesfromsteeptogentle?8c.Whateffectswouldyouseeiffluidsmovedthroughnarrowchannels?15VolcanicHazards:FlowInvestigatePartBDatePageG25Page#2a.Convertthetraveltimesintominutes.3.Makeagraphoftraveltime(yaxis)versus
3、distance(xaxis)forbothforks.4a.Whicharea(NorthForkorSouthFork)ismorelikelytohaveasteepergradient?Explain.4b.Explaintheevidenceinyourgraphsthatsuggeststhegradientsarenotconstant.4c.Explainwhetherornotyouthinkthatacommunitylocated50kmfromMt.St.Helensalongeitheroftheserivervalleyswouldhavetimeto
4、evacuateintheeventofanunexpectedmassiveeruption.15VolcanicHazards:FlowDiggingDeeperDatePagesG26-28Page#Lavaflowanoutpouringofmoltenlavafromaventorfissure;also,thesolidifiedbodyofrocksoformedItdestroysalmosteverythinginitspath;however,mostlavaflowsmoveslowlyenoughforpeopletomoveoutofthewayRate
5、ofisaffectedby:lavaflow1.slope2.coolingLavaflowsfasteronasteeperslopeAslavacools,itflowslessandlesseasilyhttp://www.youtube.com/watch?v=iyIV5fd1AwwViscositythepropertyofafluidtoofferinternalresistancetoflowLavathatislowinsilicaislessviscous15Flowsoflowsilicalavacantraveltensofkilometersfromth
6、esourceLavatubesThesurfacemaycool,crustover,andinsulatetheinterior,whichkeepsthelavaatahighertemperatureasitmovesawayfromthesourceBasaltflowscanmoveatspeedsofupto10km/honsteepslopesOnashallowslope,ittypicallymoveslessthanonekilometerperhourhttp://www.truveo.com/Kilaueas-Eruption-Fire-and-Ice/
7、id/36587611615Controltheflow1.spraywaterontothelava2.lavaflowscanalsobedivertedawayfrompopulatedareasbycarvinganewchannelorpathwaythroughthelandscapeforthelavatofollow.15Andesiticlavaiscoolerandhasahighersilicacontentthanbasalticlava;itmovesa
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