7Natural_Disasters_Flood_Lecture_Outline.docx

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Department
American Sign Language
Course
AMSL-101
Professor
landau
Semester
Fall

Description
FloodsChapter11StreamsandFloodProcessesRisingWatersChapter12FloodsandHumanInteractionsFloodsFloodingofstreamsisoneofthemorecommonandcostlytypesofnaturaldisastersintheUSAccountforonequartertoonethirdofannualdisasterdollarlossesAccountfor80oftheannualdisasterdeathsThemostcommoncauseoffloodingisPRECIPITATIONWeatherpatternsdetermineprecipitationAreaoverwhichtherainfallsDurationoftherainIntensityTheHydrologicCycleTheFateofPrecipitationWaterenterstheatmospherethroughevaporationThroughprecipitationwaterfallseitherdirectlyintotheoceanorontothelandWaterthatfallsontolandentersstreamsbyInfiltrationThemovementofwaterintorocksorsoilthroughcracksandporespacesRunoffWaterthatflowsoverthelandHowwatergetstoastreamTheDrainageBasinAcupoflandboundedbyareasofhighreliefPrecipitationthatfallswithinthecupoflandflowstothestreamasrunoffoverthesurfaceorinfiltrationandBaseflowthroughthegroundwatersystemExampleTheUnitedStatesisdividedbytheAppalachianMountainsontheEastandtheRockiesintheMidwestAllwaterfallinginbetweenthosetwomountainrangesisintheMississippiRiverDrainagebasinStreamsAbodyofrunningwaterthatisconfinedinachannelandflowsundertheinfluenceofgravityChannelwidthmayvaryfromafewcmstoseveralkmsStreamGradienttheverticaldropofachanneloverahorizontaldistanceTheheadwatersaretheupperpartofthestreamnearitssourceinthemountainsUpstreamregionsSteepGradientLowerreachesofastreamarereferredtoasdownstreamregionsShallowGradientThemouthistheplacewhereastreamchannelterminatesandenterstheseaalakeetcBaselevelisthetheoreticallimittowhichthestreamcanerodeItisineffecttheelevationofthestreamsmouthIngeneralstreamsbeginathigherelevationsanddischargeintootherstreamsandlakesrelativebaselevelthatwilleventuallyreachtheultimatebaselevelsealevel
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