A reflectance-based water quality index and its application to examine degradation of river water quality in a rapidly urbanising megacity

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dc.contributor.authorSultana, Mst Sufia
dc.contributor.authorDewan, Ashraf
dc.date.accessioned2022-01-19T14:03:17Z
dc.date.available2022-01-19T14:03:17Z
dc.date.issued2021-08-14
dc.description.abstractThe water quality in rivers around Dhaka is deteriorating very fast given extensive sources of pollutants associated with rapid urbanisation and industrialisation. This paper introduced a water quality index (WQI) utilising Landsat bands 1 to 3 (0.45 to 0.67 µm) against band 5 (1.55 to 1.75 µm). The value of the proposed index varies from – 1 to + 1, whereby around 0 (small positive and negative) indicated probable contamination, if the water depth is around 2 m or above. This approach was developed using Landsat data to study long-term water quality change in the rivers surrounding Dhaka megacity, Bangladesh. The values were converted to total suspended solids (TSS) by utilising observed in-situ data, which showed a clear seasonal influence of water pollution, suggesting it reduces to the background level with the onset of high monsoonal river flows. However, long-term analysis showed that the rivers remain polluted throughout the year, particularly since 2011. The main reason for increasing river water pollution may be linked to the contaminant load which has increased extensively in recent years. The approach developed in this study may be used in other urban rivers, particularly in Asia.en_UK
dc.identifier.citationSultana MS, Dewan A. (2021) A reflectance-based water quality index and its application to examine degradation of river water quality in a rapidly urbanising megacity, Advances in Environmental Research, Volume 5, October 2021, Article number 100097en_UK
dc.identifier.eissn1093-7927
dc.identifier.issn1093-0191
dc.identifier.urihttps://doi.org/10.1016/j.envadv.2021.100097
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17442
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectDhakaen_UK
dc.subjectUrban riveren_UK
dc.subjectWater qualityen_UK
dc.subjectLandsaten_UK
dc.subjectTotal suspended solidsen_UK
dc.subjectNormalised Difference Water Quality Indexen_UK
dc.titleA reflectance-based water quality index and its application to examine degradation of river water quality in a rapidly urbanising megacityen_UK
dc.typeArticleen_UK

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