• English
    • polski
  • English 
    • English
    • polski
  • Login
View Item 
  •   DSpace Home
  • Institute of Geophysics, Polish Academy of Sciences
  • Department of Hydrology and Hydrodynamics IG PAS
  • View Item
  •   DSpace Home
  • Institute of Geophysics, Polish Academy of Sciences
  • Department of Hydrology and Hydrodynamics IG PAS
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Assessment of Human-Induced Effects on Sea/Brackish Water Chlorophyll-a Concentration in Ha Long Bay of Vietnam with Google Earth Engine

Thumbnail
View/Open
main article (3.275Mb)
Date
2022-09-27
Author
Quang, Nguyen Hong
Nguyen, Minh Nguyen
Paget, Matt
Anstee, Janet
Viet, Nguyen Duc
Nones, Michael
Tuan, Vu Anh
Metadata
Show full item record
Abstract
Chlorophyll-a is one of the most important water quality parameters that can be observed by satellite imagery. It plays a significant function in the aquatic environments of rapidly developing coastal cities such as Ha Long City, Vietnam. Urban population growth, coal mining, and tourist activities have affected the water quality of Ha Long Bay. This work uses Sentinel-2/Multispectral Instrument (MSI) imagery data to a calibrated ocean chlorophyll 2-band (OC-2) model to retrieve chlorophyll-a (chl-a) concentration in the bay from 2019 to 2021. The variability of chlorophyll-a during seasons over the study area was inter-compared. The chlorophyll-a concentration was mapped by analyzing the time series of water cover on the Google Earth Engine platform. The results show that the OC-2 model was calibrated well to the conditions of the study areas. The calibrated model accuracy increased nearly double compared with the uncalibrated OC-2 model. The seasonal assessment of chl-a concentration showed that the phytoplankton (algae) developed well in cold weather during fall and winter. Spatially, algae grew densely inside and in the surroundings of aquaculture, urban, and tourist zones. In contrast, coal mining activities did not result in algae development. We recommend using the Sentinel-2 data for seawater quality monitoring and assessment. Future work might focus on model calibration with a longer time simulation and more in situ measured data. Moreover, manual atmospheric correction of optical remote sensing is crucial for coastal environmental studies.
URI
https://dspace.igf.edu.pl/xmlui/handle/123456789/110
Collections
  • Department of Hydrology and Hydrodynamics IG PAS

DSpace software copyright © 2002-2016  DuraSpace
Contact Us | Send Feedback
Theme by 
Atmire NV
 

 

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

LoginRegister

DSpace software copyright © 2002-2016  DuraSpace
Contact Us | Send Feedback
Theme by 
Atmire NV