Changes in turbidity and human activities along Haihe River Basin during lockdown of COVID-19 using satellite data

During the outbreak of the COVID-19, China implemented an urban lockdown in the first period. These measures not only effectively curbed the spread of the virus but also brought a positive impact on the ecological environment. The water quality of urban inland river has a significant impact on urban...

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Bibliographic Details
Published in:Environmental science and pollution research international 2022-01, Vol.29 (3), p.3702-3717
Main Authors: Chen, Xu, Chen, Wei, Bai, Yanbing, Wen, Xiaole
Format: Article
Language:English
Subjects:
Anthropogenic Effects
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
China
Communicable Disease Control
Coronaviruses
COVID-19
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental Monitoring
Environmental science
Human influences
Infrared analysis
Natural environment
Public health
Research Article
River basins
Rivers
Satellite Imagery
Turbidity
Urban areas
Urban environments
Viral diseases
Waste Water Technology
Water Management
Water Pollution Control
Water quality
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Summary:During the outbreak of the COVID-19, China implemented an urban lockdown in the first period. These measures not only effectively curbed the spread of the virus but also brought a positive impact on the ecological environment. The water quality of urban inland river has a significant impact on urban ecology and public health. This study uses Sentinel-2 visible and near-infrared band reflectance and the Normalized Difference Turbidity Index (NDTI) to analyze the water quality of the Haihe River Basin during the control period of COVID-19. It is found that during the lockdown period, the river water quality was significantly improved compared to the same period in 2019. The average NDTI of the Haihe River Basin in March decreased by 0.27, a decrease of 219.06%; in April, it increased by 0.07, that is 38.38%. Further exploration using VIIRS lights found that the brightness of the lights in the main urban area was significantly lower in February, the beginning of the lockdown. However, as the city was unblocked, the lights rose sharply in March and then recovered to normal. There is obvious asynchrony in changes between river turbidity and light. The results can help understand the impact of human activities on the natural environment.
ISSN:0944-1344
1614-7499
1614-7499
DOI:10.1007/s11356-021-15928-6