Assessment of Offshore Airport Artificial Island Construction Impact on Chlorophyll-a Using HJ-1A/B-CCD Satellite Data

It is possible to track and monitor the multi-temporal marine pollution caused by large-scale reclamation engineering techniques by using remote-sensing techniques, which can overcome the spatial and temporal constraints of situ sampling. The concentration of chlorophyll-a is a widely used indicator of phytoplankton abundance and eutrophication in marine aquatic systems. It is important to monitor the dynamic variation in the chlorophyll-a concentration of large areas and take effective measurements in a timely manner. The impact of the construction of the Dalian offshore airport artificial island on water quality was investigated by using HJ-1A/B-CCD satellite data regarding chlorophyll-a concentration at different time intervals. This study developed a satisfying regression model between the spectral reflection ratio and chlorophyll-a concentration based on HJ-1A/B-CCD satellite data and field data gathered from the Dalian offshore artificial island in China. The retrieval precision of the linear retrieval model for the third and fourth bands of the HJ-1A/B-CCD sensor was enough to objectively reveal the marine chlorophyll-a concentration distribution and its variation characteristics during the construction. The feasibility and effectiveness of using remote sensing to track and monitor marine environments affected by large-scale offshore artificial island construction were proved.