藻源型湖泛发生过程水色变化规律

中国环境科学2015,35(2)：524~532ChinaEnvironmentalScience藻源型湖泛发生过程水色变化规律李佐琛1,2,段洪涛2∗,张玉超2,邵世光2,3,马荣华2(1.西北大学城市与环境学院,陕西西安7101271；2.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏南京210008；3.河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210008)摘要：利用Y-型沉积物再悬浮发生模拟装置,模拟湖泛发生过程,分析水体吸收特性变化特征;同时,利用Hydrolight和CIE颜色匹配函数模拟水体颜色,分析湖泛水色变化规律.结果表明:在湖泛发生过程中,可溶性有色物质(CDOM)浓度(ag)不断增大,无机颗粒物浓度及吸收(ad)总体呈减小的趋势,而浮游植物色素浓度及吸收(aph)随时间变化不规律;基于Hydrolight模拟湖泛水体,离水辐亮度(Lw)和遥感反射比(Rrs)均随时间不断变小;3)另外,随SPIM或ag(443)的变大,水体颜色逐渐由绿色变为棕色.当SPIM增至40mg/L时,水体呈现棕色;当ag(443)达到10m-1时,水体呈现红棕色.通过研究湖泛发生过程水体光学特性和水色变化规律,有助于构建高精度的湖泛遥感监测模型.关键词：湖泛；吸收特性；离水辐亮度；遥感反射比；水色中图分类号：X524文献标识码：A文章编号：1000-6923(2015)02-0524-09Variationsinopticalpropertiesandwatercolorduringtheformationofblackbloomwaters:alaboratoryexperiment.LIZuo-chen1,2,DUANHong-tao2∗,ZHANGYu-chao2,SHAOShi-guang2,3,MARong-hua2(1.CollegeofUrbanandEnvironmentalScience,NorthwestUniversity,Xi’an710127,China；2.StateKeyLaboratoryofLakeScienceandEnvironment,NanjingInstituteofGeographyandLimnology,ChineseAcademyofSciences,Nanjing210008,China；3.CollegeofHydrologyandWaterResources,HohaiUniversity,Nanjing210098,China).ChinaEnvironmentalScience,2015,35(2)：524~532Abstract：Inthesummerof2007,abloomofblackwaterinLakeTaihuenteredintothepotablewatersupplyofWuxicityandleftmorethan1millionpeoplelackofdrinkingwater.Recentevidenceshowsthatthesebloomsinvolvemassiveproductionofdissolvedorganiccarbon,mostlikelyfrominorganiccarbonfixedincyanobacterialblooms.Becausebloomshavelimitedspatialandtemporaldistributions,itisdifficulttomonitortheminsitu.Remotesensingprovidesanewopportunitytomonitorthiscomplexcarbontransformation.However,littleisknownaboutthetemporaldynamicsofopticalpropertiesofblackbloomformation.Inthisstudy,weanalyzedthedailytransformationofparticulateorganicmaterialtodissolvedorganicmaterial,closelymonitoringopticalchangesandwatercolorduringthesimulationofablackwaterbloominthelaboratory.Resultsshowedthatduringblackwaterbloomformation:1)CDOMabsorptionincreasedsignificantly,whileabsorptionfromsuspendedparticulateinorganicmatterdecr