摘要
悬浮颗粒物粒径分布特征为水环境结构与功能研究提供了重要信息,但目前针对内陆湖泊的研究还很少。依据2008年—2011年鄱阳湖丰枯水期实测数据,对悬浮颗粒物粒径分布的时空特征及光学特性进行了研究。鄱阳湖悬浮颗粒物粒径具有季节性变化特点:枯水期南部湖区颗粒物粒径大于北部湖区,而丰水期南北部湖区差异不大。同时,悬浮颗粒物粒径分布对水体吸收系数、衰减系数和散射系数都有影响。鄱阳湖水体总颗粒物吸收系数北部观测值高于南部;颗粒物中值粒径与总颗粒物比吸收系数呈负相关关系,这可能是由浑浊水体中存在的矿物颗粒物打包效应引起。鄱阳湖水体总颗粒物衰减系数和散射系数的时空分布规律相似:枯水期具有明显的区域性差异而丰水期区域性差异不大。遥感反射率、总颗粒物散射系数光谱斜率以及颗粒物粒径分布斜率之间的函数关系为遥感反射率表征粒径分布情况以及定量分析悬浮颗粒物粒径分布特征对遥感反射率的影响提供了依据。悬浮颗粒物粒径分布、颗粒物后向散射概率与颗粒物复折射率密切相关,可以反映鄱阳湖水体悬浮颗粒物组分信息。
The suspended particle size distribution provides crucial information for the study of water environment structure and function .Based on the in-situ data from wet and dry season in 2008-2011 ,the paper studied suspended particle size distribution of Poyang Lake and its optical features .The suspended particle size distribution showed seasonal variation:the particle size of southern lake was larger than that of northern lake in dry season but showed little variation in wet season .The suspended parti-cle size distribution exerted influence on particulate absorption coefficient ,attenuation coefficient and scattering coefficient .The particulate absorption coefficient of northern lake was higher than that of southern lake .The negative correlation between specif-ic absorption coefficient of total suspended particles and median particle size indicated that there was“package effect”of mineral particles in turbid Poyang Lake .The spatial and temporal distribution of particulate attenuation coefficient and scattering coeffi-cient are similar:there were obvious regional differences in dry season but few in wet season .There were good correlations a-mong the remote sensing reflectance ,spectra slope of particle size distribution and spectra slope of particulate scattering coeffi-cient .These correlations would provide the foundation for remote sensing retrieval of particle size and quantitative analysis of in-fluence of suspended particle size on the optical properties .The relationship between particle size distribution ,particulate back-scattering coefficient and bulk refractive index can provide information of particle composition in Poyang Lake .
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2014年第11期3085-3089,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(41331174,41301366,41101415)
国家高技术研究发展(863计划)项目(2012AA12A304)资助
关键词
悬浮颗粒物
粒径分布
散射特性
遥感反演
鄱阳湖
Suspended particles
Size distribution
Scattering properties
Remote sensing retrieval
Poyang Lake
