基于二参数分布的流域降雨时空分析与干旱评估

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1、华中科技大学硕士学位论文AbstractWateristhesourceoflifeandthefoundationofcivilization,soit’sanimportantbirthplaceofhumancivilizationintheriverareaoftheworld.Rainfallintimeandspacecomplexityofthevariabilityhasanimportantinfluenceonrunoffbasin,rainfallpatternsintimeandspaceisveryimportantforunderstandingtempora

2、landspatialvariationofsoilmoisture,groundwaterrechargeandriverflow.Therefore,acorrectunderstandingoftheregionalspatialandtemporaldistributionofrainfallisthebasisofouranalysisoftherelevantregionaldroughtconditionsandwaterresourcesmanagement,butalsoanimportantreferenceforhydrologicalforecasting,sch

3、edulingconstructionandwaterconservancy.Inthispaper,thehistoricalrainfalldataatrainfallobservationstationistheexperimentaldata.Analyzingthespatialandtemporaldistributionpatternsofrainfallsequenceandthecombinedwiththestandardizedprecipitationindex(SPI)toassessregionaldroughtconditions.Intermsoftime

4、,thispaperusingtwoparameterGammadistributionandLognormaldistributionfitthehexicorridorinGansuprovinceriverstreamofshuleriverandheiheriverbasinfrom1966to2001totalof36monthsrainfalldistribution,andtheintroductionofamixingcoefficientrepresentstheprobabilityofnorainfall.TheresultofKolmogorov-Smirnovt

5、estshowedthatGammadistributionandLognormaldistributioncanbeagoodcharacterizationoftheHeiheRiverandShuleRivermonthlyrainfall.Byfittingtheresultsofthetwodistributionswerecompared,illustratedtheuseofgammadistributionandlognormaldistributiontorepresentrainfalldistributionofShuleandtheHeiheRiverBasini

6、sapplicable.Intermsofspace,usingthespatialinterpolationtoreflectthechangeofrainfallinspace,andcomparedtheaccuracyofinversedistanceweightingmethodandKriginginterpolationintheregionrainfallsequence.TheresultsshowedthatKriginginterpolationmethodhashigheraccuracy.II万方数据华中科技大学硕士学位论文BecauseofShuleRiver

7、andHeiheRiverBasininGansuProvincewithinthelargerateofprecipitationchangeandtheunevendistributionofrainfallduringtheyear,theBasinoftenoccurfloods,droughtdisaster.Climatearidregionwillinevitablyleadtochangesinmoisturered