Changes in turbidity and human activities along Haihe River Basin during lockdown of COVID-19 using satellite data.
Environ Sci Pollut Res Int
; 29(3): 3702-3717, 2022 Jan.
Article
in English
| MEDLINE | ID: covidwho-1356042
ABSTRACT
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.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Environmental Monitoring
/
Rivers
/
Satellite Imagery
/
Anthropogenic Effects
Country/Region as subject:
Asia
Language:
English
Journal:
Environ Sci Pollut Res Int
Journal subject:
Environmental Health
/
Toxicology
Year:
2022
Document Type:
Article
Affiliation country:
S11356-021-15928-6
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