Integrated monitoring of lakes’ turbidity in Wuhan, China during the COVID-19 epidemic using multi-sensor satellite observations

Sun, Xianghan; Liu, Jianqiang; Wang, Jianru; Tian, Liqiao; Zhou, Qu; Li, Jian

doi:10.1080/17538947.2020.1868584

Cited by 16 publications

(14 citation statements)

References 57 publications

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“…Decrease in total solids, less turbidity Less human activities and decreased discharges Turbidity levels decreased by 25% due to reduction in human activities [2,4] Improvement in suspended particulate matter Decreased of SPM by 15.9% [3] Increased water transparency Reduction in water-based activities due to lockdown [5] Decrease in nutrients Less agro-based industries, less nutrient rich waters from commercial center and urban areas [8,9] Decrease of some heavy metal concentrations in surface and ground waters Decrease in industrial discharges [9] Improvement of water quality index (based on DO, BOD, COD, pH and NH 3 -N) in rivers and lakes Significant reduction in industrial and agriculture activities and human encroachment.…”

Section: Water Qualitymentioning

confidence: 99%

“…Using remote sending techniques in their study of an Indian lake, Wagh et al [38] noted a significant reduction in chlorophyll a, colored dissolved organic matter, and total suspended solids due low pollution discharges during the COVID-19 lockdown period when anthropogenic activities were restricted, and many large and small scaled industries were closed. In addition, Sun et al [4] also noted that turbidity levels in Wuhan lakes significantly decreased due to the sharp reduction in human activities after the lockdown.…”

Section: Positive Impacts Of Covid-19mentioning

confidence: 99%

“…Dente and Hashimoto [1] noted that the COVID-19 pandemic has resulted in both positive and negative impacts to the environment and human society. The improvement of water quality and the increase in fish stocks were reported in many countries as many industries and other anthropogenic activities decreased across the globe during the restricted movement period [2][3][4]. Aquatic ecosystems including lakes, rivers, and coastal waters rapidly responded to the reduced anthropogenic impacts.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of COVID-19 on the Aquatic Environment and Implications on Aquatic Food Production

et al. 2021

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The COVID-19 pandemic, caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), resulted in ecological changes of aquatic ecosystems, affected the aquatic food supply chain, and disrupted the socio-economy of global populations. Due to reduced human activities during the pandemic, the aquatic environment was reported to improve its water quality, wild fishery stocks, and biodiversity. However, the sudden surge of plastics and biomedical wastes during the COVID-19 pandemic masked the positive impacts and increased the risks of aquatic pollution, especially microplastics, pharmaceuticals, and disinfectants. The transmission of SARS-CoV-2 from wastewater treatment plants to natural water bodies could have serious impacts on the environment and human health, especially in developing countries with poor waste treatment facilities. The presence and persistence of SARS-CoV-2 in human excreta, wastewaters, and sludge and its transmission to aquatic ecosystems could have negative impacts on fisheries and aquaculture industries, which have direct implications on food safety and security. COVID-19 pandemic-related environmental pollution showed a high risk to aquatic food security and human health. This paper reviews the impacts of COVID-19, both positive and negative, and assesses the causes and consequences of anthropogenic activities that can be managed through effective regulation and management of eco-resources for the revival of biodiversity, ecosystem health, and sustainable aquatic food production.

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Section: Water Qualitymentioning

confidence: 99%

Section: Positive Impacts Of Covid-19mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impacts of COVID-19 on the Aquatic Environment and Implications on Aquatic Food Production

et al. 2021

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“…Our results show slight seasonal variations in the area under urban settlement. This may be attributed to the mixed pixel problem which is a constraint on estimation of seasonal changes in urban settlement due to the complexity associated with Landsat image interpretation for a megacity like Kolkata [62]. Expansion of settlement areas affected other LULC classes, especially the vegetation-covered areas and open spaces.…”

Section: Effect Of Land Use and Land Cover (Lulc) Changes On Ecosystementioning

confidence: 99%

Assessment of Environmental Water Security of an Asian Deltaic Megacity and Its Peri-Urban Wetland Areas

et al. 2021

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Achieving urban water security requires sustaining the trade-offs between the exploitation of water/environmental resources and ecosystem services. This achievement not only reduces the pollution and contamination in the environment, level of water stress, but also secures good ambient water quality and future for people’s well-being and livelihoods. Changes in land use and land cover and growth of impervious structures can immediately generate severe ecological and social issues and increase the level of natural or manmade risks, affecting the condition of ecosystem services within and in the vicinity of an urban region. As a result of these transformations and further exploitation, due to the growing anthropogenic pressure, surface water and groundwater quality can be deteriorated compared to ambient water quality standards (for both chemical and biological pollutants). Based on land use and land cover (LULC) data retrieved from remote sensing interpretation, we computed the changes of the ecosystem service values (ESV) associated with the LULC dynamics, water quality and, finally, urban water security during the pre- and post-monsoon periods of 2009, 2014 and 2019 in Kolkata, an Asian deltaic megacity, and its peri-urban wetlands named East Kolkata Wetlands (EKW). The area under wetlands reduced comprehensively in 2009–2019 due to the conversion of wetlands into various other classes such as urban settlement, etc. The quality of surface water bodies (such as rivers, lakes, canals and inland wetlands) deteriorated. The groundwater quality is still under control, but the presence of arsenic, manganese and other metals are a clear indication of urban expansion and related activities in the area. As a result, there was a change in the ESV during this timeframe. In the pre-monsoon period, there was an increase in total ESV from US$53.14 million in 2009 to US$53.36 million and US$59.01 million in 2014 and 2019, respectively. In the post-monsoon period, the ESV decreased from US$67.42 million in 2009 to US$64.13 and US$61.89 million in 2014 and 2019, respectively. These changes can be attributed to the peri-urban wetlands and the benefits or services arising out of them that contribute more than 50% of the total ESV. This study found that the area under wetlands has reduced comprehensively in the past 10 years due to the conversion of wetlands for various other uses such as urban expansion of the Kolkata City, but still, this peri-urban wetland supports the urban water security by providing sufficient ecosystem services. In conclusion, the transformation in extent of the water-related ecosystem is a crucial indicator of urban water security, which also measures the quantity of water contained in various water-related ecosystems. Quantitative analysis of the LULC change, hence, is important for studying the corresponding impact on the ecosystem service value (ESV) and water quality that helps in decision-making in securing urban water future and ecosystem conservation.

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“…In that study, Avtar et al (2020) concluded that there was an elevated concentration of Chl-a during the COVID-19 lockdown. Also in Wuhan city, Sun et al (2021) employed multi-sensor satellite images (Landsat-8/OLI, Sentinel-2/ MSI, and HY-1C/CZI) to estimate the turbidity of lakes. It was found that the mean turbidity showed a 24.9% decline from 33.4 NTU to 25.1 NTU after the lockdown in Wuhan, which dropped 16.0% compared to that in the previous year (Sun et al 2021).…”

Section: Studies Of Impacts On Water Qualitymentioning

confidence: 99%

Gis And Remote Sensing: A Review Of Applications To The Study Of The Covid-19 Pandemic

Kieu

Nguyen

Hoang

2021

GES

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The spread of the 2019 novel coronavirus disease (COVID-19) has engulfed the world with a rapid, unexpected, and far-reaching global crisis. In the study of COVID-19, Geographic Information Systems (GIS) and Remote Sensing (RS) have played an important role in many aspects, especially in the fight against COVID-19. This review summarises 102 scientific papers on applications of GIS and RS on studies of the COVID-19 pandemic. In this study, two themes of GIS and RS-related applications are grouped into the six categories of studies of the COVID-19 including spatio-temporal changes, WebGISbased mapping, the correlation between the COVID-19 and natural, socio-economic factors, and the environmental impacts. The findings of this study provide insight into how to apply new techniques (GIS and RS) to better understand, better manage the evolution of the COVID-19 pandemic and effectively assess its impacts.

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Integrated monitoring of lakes’ turbidity in Wuhan, China during the COVID-19 epidemic using multi-sensor satellite observations

Cited by 16 publications

References 57 publications

Impacts of COVID-19 on the Aquatic Environment and Implications on Aquatic Food Production

Impacts of COVID-19 on the Aquatic Environment and Implications on Aquatic Food Production

Assessment of Environmental Water Security of an Asian Deltaic Megacity and Its Peri-Urban Wetland Areas

Gis And Remote Sensing: A Review Of Applications To The Study Of The Covid-19 Pandemic

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