21087.天津市降雨趨勢分析及設計暴雨研究

1、天津大學碩士學位論文天津市降雨趨勢分析及設計暴雨研究姓名：范澤華申請學位級別：碩士專業(yè)：水工結(jié)構(gòu)工程指導教師：戚藍201112ABSTRACTGlobalwarmingandrapidurbanizationchangethestatusofhydrologicalcycleindifferentdegrees，whichleadstotheincrementofstormintensityandfrequencyofhydrologi

2、calextremevalueandheavyprecipitationDesignstormisthebasicfordrainagesystemdesignandotherconstructiondesignsItsreliabilityprovidesbasisforthemunicipality’SsafetyAsthecontinuousdevelopmentofeconomy，economiclossesinducedbyt

3、hestormwaterdamageareincreasingUnderthebackgroundofclimatechange，itisimportantandnecessarytoanalyzethetrendofprecipitationandupdatethedesignstorm，aswellastoimprovethemethodologyfordesignstormThisthesisutilizedthe56yearsl

4、onghistoricaldatacollectedandprovidedbyTianjinClimateCentretoconductatrendanalysisbyemployingMannKendallnonparametricMethodItconcludesthefollowings：1heannualprecipitationisinthetrendofdecreasingAfewsamplingmethodsandextr

5、emevaluedistributionswereadoptedtostudythesehistorydataAnewIDFcurvewasdevelopedbyemployingGaussNewtonmethodThefollowingfindingswereconcluded：theexistingIDFcurvewassmaller，thanthenewlydevelopedone，thusrevisingthestorminte

6、nsityformulawassuggested；singlerecurrenceperiodrevisingIDFCHIVewassuggested；asinglereturnperiodformulaismuchmoreprecisethanthemultiplereturnperiodformula，thusthesinglereturnperiodformulashouldbeadoptedinsteadofthegeneral

7、formula；thereWasliRledifferencebetweentheresultsevaluatedbyannualsamplingmethodandrevisedannualmaximumvaluemethodIfthereWasnotsufficientstormrecords，revisedannualmaximumvaluemethodcouldbeconsideredThedesignrainfalldistri

8、butionforTianjincityWasderivatedbyHuffrainfallmethodbasedonlongtimehistoricalrainfalldataRainfalldistributionwasproposedandtheresultwasmoreaccurateAreadeductionratioforTianjincitywasdevelopednecontrolareaofeachraingaugew