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The Inversion Algorithm Research of Water Constituents in Three Gorges Dam Water

Author: GaiLiYa
Tutor: ZhangJiXian
School: Shandong University of Science and Technology
Course: Cartography and Geographic Information Engineering
Keywords: Color remote sensing Empirical model Semi-analytical model CHRIS Three Gorges Dam
CLC: TP79
Type: Master's thesis
Year: 2008
Downloads: 43
Quote: 0
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Abstract


In this paper, the Three Gorges Dam in the water as the research object, based on field measurement of the variation of the spectral reflectance of the water, in the analysis of ocean color chlorophyll, suspended solids, dissolved organic matter in three color elements absorption coefficient characteristics based on spectral reflectance of water rate of chlorophyll, suspended solids, dissolved organic matter in the relations between the three color elements concentration, empirical methods and semi-analytical methods were used to establish the concentration inversion model of the dam area of ??ocean color (chlorophyll, suspended solids, dissolved organic matter) and applied to hyperspectral remote sensing images CHRIS multi-angle, after the real-time, fast, efficient and accurate monitoring of the water quality of the Three Gorges Reservoir Area provides a method reference to better protect the ecological environment of the Three Gorges Reservoir Area. Through this study, the following conclusions: 1, total particulate matter of the Three Gorges Dam in November Water absorption coefficient spectral distribution similar to the absorption spectrum of the non-algal particles decreases with wavelength and power exponentially decay ; contribution to the absorption coefficient of the total particulate matter in the different bands phytoplankton and algae particles not only are different, and the proportion is not a constant, but with the wavelength of the variable. 2, between the waters of the Three Gorges Dam in the non-algal particles and CDOM absorption coefficient and wavelength obvious exponential decay law. Regression simulation of the measured data, we established the non-algae particles based on 440nm band of the Three Gorges Dam in water absorption coefficient model and CDOM absorption coefficient model. 3 differs from Taihu Lake and other inland II water and other water, there is a good polynomial relationship between the absorption coefficient of the Three Gorges Dam in phytoplankton chlorophyll a concentration. The other absorption coefficient of phytoplankton and chlorophyll a multi presented a power function, exponential relations. 4, on the basis of analysis of the spectral reflectance of the concentration of color elements and water correlation, select the top band, and concentration of color elements experience inversion model. Proved by the inversion of the CHRIS remote sensing images acquired by different periods, the chlorophyll concentration of inversion model of CDOM inversion model inversion of high precision and time better scalability. 5, in the analysis of various water components of the water absorption coefficient of the backward scattering coefficient contribution based on the combination of the Gordon model, the concentration of ocean color inversion of the Three Gorges Dam in the semi-analytical model, and the use of algebraic methods solved for the Three Gorges Dam in water chlorophyll a, suspended solids concentration. Chlorophyll concentration retrieval precision of the accuracy of the inversion of the concentration of suspended solids.

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