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- Title
Spatio-temporal assessment and monitoring of chlorophyll-a in lake water through geo-informatics algorithm approach (GAA).
- Authors
Rajkumar, Sri Vishnu Prasanth Balachandran; Sivakumar, Ramamoorthy
- Abstract
Inland lake is the most valuable source of the freshwater ecosystem on the earth. It is highly needed for continuous monitoring to examine the lake water quality and its eutrophic conditions. The water quality is deteriorated due to climatic change and increased anthropogenic activities. Chlorophyll-a is an important biological index for lake water quality assessment. The satellite monitoring technique is used to estimate and monitor the phytopigment concentration in the lake water through spatial–temporal studies. In the research, algorithms were developed based on the spectral wavelength of the Sentinel-2MSI sensor for the retrieval of chl-a concentration. The various algorithms were developed based on the empirical computation of the spectral dataset. The result illustrates that the spectral band ratio algorithm (SBA) has high accuracy obtained for the spectral wavelength combinations of 665 nm and 783 nm with (R2 = 0.8066; R = 0.8980; RMSE = 2.650 mg m−3) than derivative algorithm (DA) which has moderate accuracy obtained (R2 = 0.7302; R = 0.8545; RMSE = 3.076 mg m−3). The best appropriate algorithm was selected and incorporated into Sentinel-2MSI for chlorophyll-a estimation. The developed algorithm also has merits in retrieving the chl-a for pre-flood and post-flood periods in the Vembanad Lake for 2018. The spatial–temporal distribution of chl-a is mapped and provides information on the Phytopigment distribution in the lake. The results also provide that Sentinel-2MSI had the potential for monitoring chlorophyll-a in the freshwater lake due to its high spatial and spectral resolution. The five-day revisit period of this satellite is suitable for continuous monitoring of the Chl-a concentration.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 14, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-10494-8