中文摘要：

为监测珠江口河网区水体的盐度变化，基于同步测量的水体黄色物质、盐度和水体表面光谱数据，利用MATLAB分析了水体光谱反射率和黄色物质浓度之间的关系。结果表明：在磨刀门水道，反射率与黄色物质在400nm处的吸收系数g400有较好关系，在R704／R513处，R^2=0．70；在虎门水道，g400与反射率比值R703／R488之间也有较强的负相关，R^2=0．58。同样，又分析了磨刀门和虎门水道黄色物质吸收系数与表面盐度的关系，都发现了较好的相关性，R^2〉0．67。根据以上分析，得到了一种珠江口河网区水体表面盐度监测的新方法，并采用中等分辨率成像光谱仪（MERIS）的模拟数据来进行模型验证，结果表明利用MERIS数据对珠江口河网区咸潮进行监测是可行的（均方根误差小于0．308％）。

英文摘要：

Spectra, salinity, total suspended solids and colored dissolved organic matter are sampled at 44 locations in the Pearl River estuary on December 18, 19 and 21, 2006. The samples are analyzed. Based on the experimental results, the relationship between the absorption coefficient of chromophoric dissolved organic matter （ CDOM ; g400 ） and the remote sensing reflectance is obtained. In the Modaomen waterway, the result shows that there is a strong positive linear relationship between the in-situ reflectance ratio （R704/R513 ） and g400 （R^2 = 0.7, P 〈 0. 001 ） ; and in the Humen waterway, a negative linear relationship between the in-situ reflectance ratio （ R703/R488 ） and g400 （ R^2 = 0.58, P 〈 0. 001 ） is found. Additionally, the absorption coefficient of CDOM and the salinity in the two waterways are studied, and the two parameters are highly correlated （R^2 〉 0.67）. Finally, using the result of this study, a novel method is developed to monitor the surface salinity distribution in estuarine waters. The new method is validated using the simulated Medium Resolution Imaging Spectrometer Instrument （MERIS） data with satisfactory results. The study demon- strates that the salinity variation in the Pearl River estuary （ ERMS 〈 0. 308% ） can be monitored by remote sensing techniques （e. g. , MERIS）.