Classification of Inland Waters Based on Bio-Optical Properties
Classification of Inland Waters Based on Bio-Optical Properties
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DOI：
10.1109/jstars.2013.2290744
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发表时间：
2014-02
影响因子：
5.5
通讯作者：
Kun Shi;Yunmei Li;Yunlin Zhang;Lin Li;Heng Lv;K. Song
中科院分区：
文献类型：
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作者：
Kun Shi;Yunmei Li;Yunlin Zhang;Lin Li;Heng Lv;K. Song
在中国的太湖、巢湖、三峡水库和滇池进行了多次光活性物质的生物光学测量。通过对遥感光谱（Rrs(λ)）进行分层聚类分析，将这些水域聚为3种不同的光学类型（I型、II型和III型）。利用线性函数模拟了浮游植物的吸收系数，不同水系的吸收系数不同。彩色溶解有机质（CDOM）吸收的坡度可聚为两类，一类为高坡度，为第一类和第二类，另一类为低坡度，为第三类。采用均匀模型对不同水系间非藻粒子吸收系数谱进行了参数化。利用幂律函数参数化散射系数，将散射光谱的斜率分为两组，一类为高斜率，二类为低斜率。颗粒组成、颗粒散射和非藻颗粒吸收是控制相应类型水域Rrs（λ）变化的因素。这些结果支持了这样一个事实，即在建立模型来估计多类型光学水的水质参数之前，对水进行分类是必不可少的。
Multiple bio-optical measurements of optically active substances were conducted in Taihu Lake, Chaohu Lake, Three Gorges Reservoir, and Dianchi Lake (China). A hierarchical cluster analysis was applied to remote sensing spectra (Rrs(λ)), by which those waters were clustered into three optically distinct types (Type I, Type II, and Type III). Absorption coefficients of phytoplankton were simulated using the linear function and the coefficients of the functions varied in different water types. The slope of colored dissolved organic matter (CDOM) absorption could be clustered into two classes, one class of high slope for Types I and II, whereas the other class of low slope for Type III. A uniform model was used for parameterization of the nonalgal particles absorption coefficients spectral between different water types. The power-law function was used to parameterize the scattering coefficient and the slope of scattering spectra could be classified into two groups of high slope for Types I and II, low slope for Type III. The composition of particles, particulate scattering, and nonalgal particulate absorption are the factors controlling the variability in Rrs(λ) for corresponding type waters. Those results support such a fact that it is indispensable to classify waters before developing a model to estimate water quality parameters for multi-type optical waters.