四川省干旱时空分布特征分析

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1、四川师范大学硕士毕业论文ThestudyfoundthatthedistributionofprecipitationinSichuanProvinceshowedobvioustemporalandspatialdistribution．Inthetimedistribution，thecharacteristicsofprecipRationchangesduringtheyeararetwolowermiddlehigh．Precipitationbegantograduallyincreasefromspring，reachedthehighestinJul

2、yorAugustandthenbegantodedine．Inthislongprocessfrom1961to2010inSiehuanProvince，therehadbeenageneraluptrendtheannualprecipitationofalltheweatherstationinSichuanProvincehadsomefluctuations．Althoughsometimesfluctuationed．Inspace，higjlannualprecipitationisinEastSichuanhillyareaandChengduPl

3、ain，WestSichuanPlateauregionisgenerallylow．Throughthestatisticalanalysisofthestandardizedprecipitationindexcaleulationresults，thedistributionofdroughtfrequencyinSichuanProvinceisrelativelyuniformandnosignificantcorrelationwitllelevation．Every7．8amoderateorabovedrought(SPIstandard)occur

4、redinSichuanProvince．Intheperiodfrom1961to2010，thedroughtintensityhadnosignificantlystrengthened，butdroughttimesthanrise，suggestingthattheareaofSichuanProvincedroughtaffectedisexpanding．Intheperiodfrom1961to2010，thedroughtintensityhadnosignificantlystrengthened，butdroughtareaisexpandin

5、g．ThetemperaturevegetationdroughtindexdataobtainedbytheMODISdataproductsshowthemostseriousdroughtoccurredinSichuanBasininthedroughteventsin2006，SuiningcityandNanchongcityisthemostseriousineasternSichuanarea．In2006，SichuanProvince’sprecipitationaresignificantlyless，thedegreeofdroughtint

6、heprovinceallrised．The2010droughtismainlyinPanxiregion，thedroughthasbeenfrom2009Octoberuntil201OApril．IVKeywords：DroughtSPITVDIKriginginterpolation目次摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯”IABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯”III1绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯”11．1研究意义及研究背景⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯’11．2四川省干旱成因分析⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯21．2．1地形造成的特殊气候⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯’21．2．2大气环流异常⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯’31．2．3降水量时空分布不均⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯”31．3国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．3．1干旱分类⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯’3l。3．2干旱评价指标⋯⋯⋯⋯⋯⋯⋯⋯⋯