Inversion of Chlorophyll-a Concentration in Tropical Islands in China: a Case Study of Wuzhizhou Island

摘要

Inversion of water components concentration of inland water body was hotspot and difficulty problem in water quality remote sensing. Based on the measured data of the concentrations of Chlorophyll-a in tropical islands waters area of China and the recent synchronous remote sensing image data, the inversion simulation was carried out to realize the spatio-temporal monitoring of the sea area. Through the analysis of the correlation between the radiation intensity of the water supply in the 1-4 bands of Wuzhizhou Island in 2010 and 2014 and the Chlorophyll-a concentration in Wuzhizhou Island, the Chlorophyll-a concentration inversion model was established. The distribution of Chlorophyll-a concentration in the study area was simulated, and the change of Chlorophyll-a concentration in four years was analyzed. The results showed that the Chlorophyll-a concentration in the blue and green bands was higher, and the ratio of the two as the independent variables could effectively reflect the Chlorophyll-a concentration in Wuzhizhou Island. The Chlorophyll-a concentration increased significantly from 2010 to 2014. Due to the impact of human activities, the concentration of Chlorophyll-a in tourism concentrated areas was low.