内陆湖泊水体固有光学特性的典型季节差异

Differences of inherent optical properties of inland lake water body in typical seasons

固有光学特性是水体光学性质的重要内容,是水色反演分析模型建立的基础.本研究利用定量滤膜技术(QFT)和后向散射测量仪BB9,对太湖梅梁湾夏、冬季水体的有色可溶性有机物(CDOM)吸收系数、总悬浮物吸收系数和总悬浮物后向散射系数进行了观测.在分别对两季节水体组分吸收系数、后向散射系数光谱特征分析的基础上,阐明其季节差异性,并结合水质参数的变化,揭示导致两季节水体固有光学特性不同的原因,达到通过固有光学量反映水环境状态的目的.初步建立了后向散射系数与悬浮物浓度的关系模型,为分析模型的构建提供了参数保障.

Inherent optical property is one of the important properties of water body, which lays the foundation for the establishment of water color analytical models. By using quantity filter technology （QFT） and BB9 backscattering meter, the absorption coefficients of chromophoric dissolved organic matter （CDOM） and total suspended matters （TSM） and the backscattering coefficient of TSM in the water body at Meiliang Bay of Taihu Lake were measured in summer and winter. Based on the spectral comparison of the absorption and backscattering coefficients, their differences between the two seasons were demonstrated, and the reasons that caused these differences were also explored in the context of their relations to the changes in water quality. Consequently, water environment condition could be revealed by using the inherent optical property. The relationship between the backscattering coefficient and the TSM concentration was established, which could provide supporting coefficients to the analytical models to be developed.