湖泊水体光学特性及遥感监测机理研究

项目名称： 湖泊水体光学特性及遥感监测机理研究

项目编号： No.40801145

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 化学工业

项目作者： 龚绍琦

作者单位： 南京信息工程大学

项目金额： 19万元

中文摘要： 湖泊水体光学特性是建立其遥感信息模型的基础，以太湖为研究区，通过野外光学实验和室内单组分实验，研究了湖泊水体光学特性和遥感机理。采用定量滤膜技术，研究了水体藻类、非色素悬浮物和可溶性有机物的吸收特性，阐明了产生吸收特性的机理；通过仪器现场测量，研究了水体颗粒散射和后向散射变化规律；并通过室内培养和配制微囊藻和无机悬浮物溶液，进行单一组分的吸收和散射实验，以期实现混合光谱分离提取；分别建立了各组分吸收和散射光谱定量模式。通过水下光谱辐照度和辐亮度的测量，研究了气-水界面漫反射光学参数f、辐射光场因子Q、反射率r、透射率t、以及水体漫衰减系数和湖底反射率。研究了水体表观光学特性与固有光学量之间的关系，建立了湖泊水色遥感的半分析模型。利用实测高光谱数据和多光谱影像，分别反演了水体组分浓度，具有较好的效果。

中文关键词： 太湖;光学特性;半分析模型;遥感;高光谱数据

英文摘要： The optical properties of lake waters are the foundation to establish water color remote sensing quantitative model. Taking Taihu lake as a research area, we studied the principle of the waters optical properties and discovered the lake color remote sensing mechanism by integrating optical measurements in situ and experiments for aglae and suspended particles in the laboratory. The characters of algae, de-pigmented particles and colored dissolved organic material absorbing light are found out by quantitative filter technique, then their reasons are explained. The variabilities of scattering and backscattering of total suspended particles are demonstrated by instrument measurement in situ. We cultivated Microcystis in the lab, confected Microcystis and sediment solution, then measured their absorbing and scattering spectrums with instrument AC-S and BB-9. Single and pure spectrum characteristic of algae and suspended particles is analyzed respectively in order to retrieve and separate them from mixed ones in the lake waters. Finally, the absorption, scattering and backscattering spectral quantitative modes for each component are deduced. By profiling optical measurement, diffuse reflective parameter f, radiant field factor Q, bidirectional aspect r and transmittance of downward irradiance and upward radiance in the air-water interface are determined, the variabilities of diffuse attenuation coefficient and lake bottom reflectance were discussed. After the relationship of apparent optical variables and inherent ones was analyzed, lake color semianalytical model was derived by optimization method. Lake water components concentrations were retrieved respectively from hyperspectral data and multispectral image and their accuracy are ideal.

英文关键词： Lake Taihu;Optical properties; Semianalytical model; Remote sensing; Hyperspectral data