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乐成峰,李云梅,查勇,孙德勇,王莉珍.太湖悬浮物对水体生态环境的影响及其高光谱反演[J].环境科学学报,2008,28(10):2148-2155
太湖悬浮物对水体生态环境的影响及其高光谱反演
- Inversion of hyperspectral reflectance for estimating suspended matter concentration in Lake Tai
- 基金项目：国家自然科学基金资助项目(No.40571110);教育部留学回国人员科研启动基金(No.20071108)
- 作者
- 单位
- 乐成峰
- 虚拟地理环境教育部重点实验室, 南京师范大学, 南京 210046
- 李云梅
- 虚拟地理环境教育部重点实验室, 南京师范大学, 南京 210046
- 查勇
- 虚拟地理环境教育部重点实验室, 南京师范大学, 南京 210046
- 孙德勇
- 虚拟地理环境教育部重点实验室, 南京师范大学, 南京 210046
- 王莉珍
- 虚拟地理环境教育部重点实验室, 南京师范大学, 南京 210046
- 摘要：利用太湖水质参数数据、水面以下实测光谱数据以及水-气界面辐射传输模型,计算得到了水体漫射衰减系数和水面以上遥感反射比,探讨了悬浮物对水体中营养盐以及水下光照等水体环境因子的影响,在此基础上,利用水面以上遥感反射率建立了悬浮物浓度的定量反演模型.研究结果表明:悬浮物浓度与水体下行漫射衰减系数具有很好的相关性,在可见光波段相关系数达到0.8以上,与真光层深度具有很好的负指数关系;水面以上遥感反射比与悬浮物浓度对数(ln(TSS))具有很好的相关性,在500～600nm范围内呈负相关,在620～882nm范围呈正相关,最大负相关出现在522nm附近,最大正相关出现在692nm附近;选用Rrs(522nm)、Rrs(692nm)以及其比值作为变量建立悬浮物反演模型,得出的单波段线性对数模型能够较好地反演悬浮物浓度.
- Abstract：Above-water remote sensing reflectance and scattering extinction coefficients of water were derived by modeling radiative transfer across the water-air interface with in situ measured water quality data and beneath water spectral reflectance measurements in Lake Tai.The effect of suspended matter on environmental factors of the water such as nutritive salts and beneath water light conditions was addressed.The results indicate that the suspended matter concentration is highly correlated to the downwelling scattering extinction coefficient.The correlation coefficient can be 0.8 or larger and this correlation can be described by a power decay relationship.Additionally,there is a high correlation between above water remote sensing reflectance and logarithmic suspended matter concentration,which is negative in the region 500～600 nm with the maximal value at 522 nm,and positive in the region 620～882 nm with the maximal value at 692 nm.The derived remote sensing reflectance at R(522 nm),R(692 nm)and their ratios were separately used to build inversion models for estimating suspended matter concentration and the result indicates that a linear logarithmic model with a single band is effective in estimating the suspended matter concentration from the reflectance.
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