Remote Sensing Inversion Of Chlorophyll-a Concentration In The Eastern Coastal Zone Of Taihu Lake Based On High Resolution Image

Taihu Lake is one of the five largest freshwater lakes in China.In recent years,the eutrophication of Taihu Lake has become increasingly serious.Remote sensing technology has the advantages of large scale,fast speed and low cost,so it is of great significance to monitor Taihu Lake water body by using remote sensing technology.In this study,the eastern coast of Lake Taihu was taken as the research object,high-resolution image data,water spectral data and chlorophyll a concentration data in the eastern coast of Taihu Lake were obtained,the seasonal variation of chlorophyll a concentration and optical characteristics in the eastern coastal waters of Taihu Lake were analyzed.A remote sensing inversion model of chlorophyll a concentration in the eastern coastal waters of Taihu Lake was constructed based on measured water spectral data and Gaofen-1 satellite image data,the temporal and spatial variations of chlorophyll a concentration in the eastern coastal waters of Taihu Lake were also analyzed.The main research contents are as follows:(1)High-resolution image acquisition and processing,water spectral measurement and chlorophyll a concentration measurement in the eastern coast of Taihu Lake.Highresolution images are processed by ENVI software,high-resolution satellite imagery is used for high-resolution imagery,on-site water spectral measurement is based on the above-water surface measurement method,and chlorophyll a concentration measurement is based on PHYTO-PAM phytoplankton fluorescence meter.(2)The inversion model of chlorophyll a concentration in the eastern coast of Taihu Lake was established.A band ratio model and a normalized vegetation index model were constructed based on the high score 1 image data and chlorophyll a concentration data.(3)The temporal and spatial variation of chlorophyll a concentration in the eastern coast of Taihu Lake was analyzed.In terms of time,the trend of chlorophyll a concentration in the eastern coast of Taihu Lake in different seasons is summer > autumn.From the perspective of spatial change,the chlorophyll a concentration in Xuhu Bay of East Taihu Lake and its coastal waters is lower,while the chlorophyll a concentration in the southern and western waters of Xuhu Bay is higher.