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Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India
Communication

Citizen Science Tools Reveal Changes in Estuarine Water Quality Following Demolition of Buildings

1
Nansen Environmental Research Centre India, Amenity Centre, Kerala University of Fisheries and Ocean Sciences, Madavana Junction, Kochi 682 506, Kerala, India
2
Fishery Resources Assessment Division, ICAR-Central Marine Fisheries Research Institute, Abraham Madamakkal Road, Kochi 682 018, Kerala, India
3
CSIR-National Institute of Oceanography, Regional Centre Kochi, Kochi 682 018, Kerala, India
4
Centre for Geography and Environmental Science, College of Life and Environmental Sciences, University of Exeter, Penryn TR10 9FE, Cornwall, UK
5
National Centre for Earth Observation, Plymouth Marine Laboratory, Plymouth PL1 3DH, Devon, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Hatim Sharif
Remote Sens. 2021, 13(9), 1683; https://doi.org/10.3390/rs13091683
Received: 19 February 2021 / Revised: 23 April 2021 / Accepted: 25 April 2021 / Published: 27 April 2021
Turbidity and water colour are two easily measurable properties used to monitor pollution. Here, we highlight the utility of a low-cost device—3D printed, hand-held Mini Secchi disk (3DMSD) with Forel-Ule (FU) colour scale sticker on its outer casing—in combination with a mobile phone application (‘TurbAqua’) that was provided to laymen for assessing the water quality of a shallow lake region after demolition of four high-rise buildings on the shores of the lake. The demolition of the buildings in January 2020 on the banks of a tropical estuary—Vembanad Lake (a Ramsar site) in southern India—for violation of Indian Coastal Regulation Zone norms created public uproar, owing to the consequences of subsequent air and water pollution. Measurements of Secchi depth and water colour using the 3DMSD along with measurements of other important water quality variables such as temperature, salinity, pH, and dissolved oxygen (DO) using portable instruments were taken for a duration of five weeks after the demolition to assess the changes in water quality. Paired t-test analyses of variations in water quality variables between the second week of demolition and consecutive weeks up to the fifth week showed that there were significant increases in pH, dissolved oxygen, and Secchi depth over time, i.e., the impact of demolition waste on the Vembanad Lake water quality was found to be relatively short-lived, with water clarity, colour, and DO returning to levels typical of that period of year within 4–5 weeks. With increasing duration after demolition, there was a general decrease in the FU colour index to 17 at most stations, but it did not drop to 15 or below, i.e., towards green or blue colour indicating clearer waters, during the sampling period. There was no significant change in salinity from the second week to the fifth week after demolition, suggesting little influence of other factors (e.g., precipitation or changes in tidal currents) on the inferred impact of demolition waste. Comparison with pre-demolition conditions in the previous year (2019) showed that the relative changes in DO, Secchi depth, and pH were very high in 2020, clearly depicting the impact of demolition waste on the water quality of the lake. Match-ups of the turbidity of the water column immediately before and after the demolition using Sentinel 2 data were in good agreement with the in situ data collected. Our study highlights the power of citizen science tools in monitoring lakes and managing water resources and articulates how these activities provide support to Sustainable Development Goal (SDG) targets on Health (Goal 3), Water quality (Goal 6), and Life under the water (Goal 14). View Full-Text
Keywords: water quality; mini Secchi disk; Vembanad Lake; demolition waste; citizen science water quality; mini Secchi disk; Vembanad Lake; demolition waste; citizen science
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MDPI and ACS Style

Menon, N.; George, G.; Ranith, R.; Sajin, V.; Murali, S.; Abdulaziz, A.; Brewin, R.J.W.; Sathyendranath, S. Citizen Science Tools Reveal Changes in Estuarine Water Quality Following Demolition of Buildings. Remote Sens. 2021, 13, 1683. https://doi.org/10.3390/rs13091683

AMA Style

Menon N, George G, Ranith R, Sajin V, Murali S, Abdulaziz A, Brewin RJW, Sathyendranath S. Citizen Science Tools Reveal Changes in Estuarine Water Quality Following Demolition of Buildings. Remote Sensing. 2021; 13(9):1683. https://doi.org/10.3390/rs13091683

Chicago/Turabian Style

Menon, Nandini, Grinson George, Rajamohananpillai Ranith, Velakandy Sajin, Shreya Murali, Anas Abdulaziz, Robert J.W. Brewin, and Shubha Sathyendranath. 2021. "Citizen Science Tools Reveal Changes in Estuarine Water Quality Following Demolition of Buildings" Remote Sensing 13, no. 9: 1683. https://doi.org/10.3390/rs13091683

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