[Hyperspectral remote sensing of chlorophyll a concentrations in the Lake Taihu, based on water optical classification].

Four field investigations into the Lake Taihu were carried out for collecting in situ observed data in Nov., 2006, Nov., 2008, May and Aug.

[Hyperspectral remote sensing of total suspended matter concentrations in Lake Taihu based on water optical classification].

Four field investigations were carried out in the Taihu Lake for collecting in situ observation data in Nov. 2008, Apr. 2009, May and Aug.

[Scattering and backscattering characteristics of Lake Chaohu].

Lake scattering characteristics are of great significance for remotely-sensed retrieval model development. In this study, scattering and backscattering coefficients of Lake Chaohu were observed through AC-S and ECO-BB9 meters, and their spectral properties were correspondingly analyzed. Then Power function is utilized to model particulate scattering and backscattering spectra, and spectral slope parameters obtained by simulation are 0.

[Depth profile of suspended particle scattering coefficient and its impact factors in Taihu Lake].

To acquire the depth profile of suspended particle scattering coefficient and the mechanism of surface reflection, three different depths of Taihu Lake scattering coefficient and backscattering coefficient are obtained in Nov. 2008, respectively. And their characteristic variation with depth is studied.

[Optical properties and remote sensing retrieval model of diffuse attenuation coefficient of Taihu Lake water body].

The spectral and chemical analytical data of Taihu Lake water quality in Nov. 8-22, 2007 were used to analyze the spectral characteristics of diffuse attenuation coefficient (Kd) of the water body in autumn and related affecting factors. On the basis of this analysis, the Kd at band 490 nm, Kd (490), was used as a variable to build the relationship between Kd and remote sensing reflectance.

[Characteristics of the diffuse attenuation coefficient and its impact on aquatic ecology environment].

According to the optical property data measured in Taihu Lake at October and November 2006, the characteristics of the diffuse attenuation coeffcient (Kd), the contribution of each factor effecting on Kd and the effect of Kd on the aquatic ecology environment were analyzed. The results indicate that, the diffuse attenuation coefficient Kd of Taihu Lake has two main trends in the whole visible wavelength range (400-700 nm). The first type is that, Kd decreases with the wavelengths by exponential style in the range of less than 571 nm wavelengths, and the second type is that, Kd is in the form of fluctuations in the range of larger than 571 nm wavelengths.

[Seasonal variation of in water constituents' absorption properties in Meiliang Bay of Taihu Lake].

Seasonal variance in absorption properties of water constituents was analyzed and predominant factor of spectrum absorption in different seasons was discussed using the data sets collected in August and November 2006 and March 2007 from Meiliang Bay in Taihu Lake. The results indicate that, the absorption of water constitutions has seasonal variation characteristic. Total suspended sediment has the greatest absorption coefficient in summer, the average absorption at band 440 nm is (7.

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

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.

[Spatio-temporal distribution of chlorophyll a concentration and its estimation in Taihu Lake].

The temporal and spatial distribution of chlorophyll a concentration in Taihu Lake was analyzed using the data measured from January to October in 2005. Otherwise, chlorophyll a retrieval model was built using the synchronous spectrum data obtained in different season to evaluate the effect of chlorophyll a concentration temporal and spatial variation on the retrieval model. Firstly, temporal distribution of chlorophyll a concentration was analyzed.

[Scattering characteristics of Taihu Lake and its relationship models with suspended particle concentration].

Water scattering characteristics are closely related to water quality parameters, such as suspended particles and their concentrations. Through the observing system of water inherent optical properties, which were developed by WETlabs Inc, the backscattering and scattering coefficients of Lake Taihu had been obtained in Oct. 2006 and Nov.

[Water color parameter spatial distribution character and influence on hygrophyte photosynthesis in Taihu Lake].

Using 64 stations water quality data collected in Taihu Lake, the spatial distribution of water color parameters and euphotic depth was analyzed, and the potential effect on hygrophyte photosynthesis was discussed. The result showed that the most variation was found for Chl a concentration, the value varies from 1.67 microg x L(-1) to 159.