The Study of Spatial-Temporal Characteristics for Chlorophyll Concentration derived from Remote Sensing Image in Xinfengjiang Reservoir

By investigating the law of radiative transfer and the process of scattering and absorption from suspended sediment，chlorophyll and oxygen\|consuming organics，this paper builds the model，it formulate the functional relationship between the reflection and the concentration of this three kinds of water quality parameters，therefore retrieve the concentration.With this model，the chlorophyll concentration in Xinfengjiang Reservoir can be inversed，then using the measured data to verify the inversion result，the correlation coefficient between them equals 0.94，and the average relative error equals 66.67%.By analyzing the characteristics of the chlorophyll spatial structure and its time distribution based on the result，we find out that the lowest concentration of the chlorophyll is always existing in the center area during the whole year，and the area near Xinfengjiang River and Zhongxinshui River has the highest concentration，associated with cage culture.Multiple factors has been considered in the model building in this paper，and hence multi\|spectral remote sensing data were successfully applied to improve the calculation accuracy.