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时间:2019-01-09
《近40年丹江口库区潜在蒸散量变化特征及影响因素》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、近40年丹江口库区潜在蒸散量变化特征及影响因素 摘要:全球气候变化背景下,丹江口库区潜在蒸散量变化特征对于南水北调中线水源区水循环研究及水资源评估具有重要意义。应用PenmanMonteith蒸散模型估算潜在蒸散量,分析近40年丹江口库区潜在蒸散量和干燥度指数时间变化规律,研究结果表明:(1)丹江口库区年降水量呈波动减少趋势,年均值839.9mm,其中年降水量、雨季和旱季降水量分别以143mm/(10a)、45mm/(10a)和90mm/(10a)的速率减少;(2)丹江口库区年蒸散量呈波动增加趋势,年均值8600mm,其中
2、年蒸散量、雨季和旱季蒸散量分别以122mm/(10a)、102mm/(10a)和29mm/(10a)的速率增加;(3)丹江口库区干燥度指数呈波动增加趋势,年均值107,其中年干燥度指数、雨季和旱季干燥度指数分别以002/(10a)、007/(10a)和031/(10a)的速率增加;(4)潜在蒸散量与干燥度指数和相对湿度呈显著负相关性,与平均风速和日照时数呈显著正相关性,与温度相关性不显著。近40年来,由于降水量减少和蒸散量增加,丹江口库区气候有向干旱化演变的趋势。 关键词:潜在蒸散;干燥度指数;雨季和旱季;距平百分率 中
3、图分类号:P426文献标志码:A文章编号: 16721683(2016)06005006 [JP2]VariationcharacteristicsandinfluencingfactorsofpotentialevapotranspirationinDanjiangkoureservoirarea16 WANGTiejun1,XIAOYe2,HUANGZhigang2,3,YAOLunguang1,CHANGWei1,WANGChenxi1,WEIShengNan1 (1.KeyLaboratoryofEcolog
4、icalSecurityforWaterSourceRegionofMidlineProjectofSouthtoNorthWaterDiversioninHenanProvince,NanyangNormalUniversity,Nanyang473061,China; 2.CollegeofResourceEnvironmentandTourism,HunanUniversityofArtsandScience,Changde415000;3.NortheastInstituteofGeographyandAgroec
5、ology,ChineseAcademyofSciences,Changchun130102,China) Abstract:Variationcharacteristicsofpotentialevapotranspiration(ET0)hasimportantsignificanceinwatercycleresearchandwaterresourceassessmentinthebackgroundofglobalclimatechangeinDanjiangkoureservoirarea.ET0anddryi
6、ndex(DI)measuredbyPenmanMonteithmodelwereanalyzedbasedonthemeasuredmeteorologicaldataduring19702009,whichcamefromtheNationalMeteorologicalCenterpublicnetwork.Theresultsshowedthat:(1)Annualprecipitationwithameanvalueof839.9mmdecreasedwiththeincrementofannualseries,a
7、ndtheannual,rainyseasonanddryseasonprecipitationdecreasedby14.3,4.5and9.0mm/(10a)respectively.(2)AnnualET0withameanvalueof860.0mmincreasedwiththeincrementofannualseries,andtheannual,rainyseasonanddryseasonET0increasedby1612.2,10.2and2.9mm/(10a)respectively.(3)Annua
8、lDIwithameanvalueof1.07increasedwiththeincrementofannualseries,andtheannual,rainyseasonanddryseasonDIincreasedby0.02,0.17and0.31mm/(10a)respectiv
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