Water Turbidity Monitoring of Zhiyin and Huangjia Lakes in Wuhan for COVID-19 Epidemic Using HY-1C CZI Data

Water turbidity is one of the most important parameters of inland lake water quality and an important influencing factor of water environment ecosystem.Affected by coronavirus disease 2019(COVID-19) epidemic, during the period from January 25, 2020 to February 5, 2020, Wuhan government built two emergency hospitals, namely Huoshenshan Hospital and Leishenshan Hospital, to cope with the epidemic. In the process of hospital construction, dynamic monitoring of turbidity in the adjacent waters is helpful for epidemic prevention and government decision-making. Using Chinese high-resolution Haiyang-1C (HY-1C) coastal zone imager (CZI) data, combined with high-frequency in-situ turbidity measurements, a turbidity model uitable for Wuhan waters is established (determinant coefficient: R²>0.85; root mean square error: RMSE < 5.50 NTU). Through the analysis of the variations of turbidity at Zhiyin, Huangjia, and Zhushan lakes before, during, and after constructions of Huoshenshan or Leishenshan hospitals, we find out that the variation trends of waters near and away from Huoshenshan or Leishenshan hospitals are similar, which indicates that the constructions of the two hospitals doesn't affect the nearby waters. This study also shows that Chinese HY-1C CZI has the potential to retrieve turbidity in small inland waters.