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Water Quality, Exposure and Health

, Volume 5, Issue 4, pp 197–214 | Cite as

Assessment of Water Quality of a River-Dominated Estuary with Hydrochemical Parameters: A Statistical Approach

  • P. Padma
  • V. S. Sheela
  • S. Suryakumari
  • K. V. Jayalakshmy
  • S. M. NairEmail author
  • N. C. Kumar
Original Paper
  • 314 Downloads

Abstract

This study was aimed (1) to evaluate the water quality of Chalakudy river, the fifth longest (145.5 km) river of Kerala (South India), by assessing the general hydrochemical parameters like temperature, dissolved oxygen (DO), salinity and chemical oxygen demand (COD) on a seasonal and spatial basis and (2) to manifest the data using statistical tools like analysis of variance, dendrograms, non-metric multidimensional scaling (nMDS), trellis diagrams, discriminant analysis etc., so as to identify the factors and sources influencing the quality of river water. The sustainability of Chalakudy river estuarine ecosystem is of great significance as thousands of people depend on this particular river, and it is one of the very few rivers in the state of Kerala which is having relics of riparian vegetation in substantial level. DO showed significant differences between estuarine stations and other stations in the trellis diagram. Distribution of COD in water, arranged over seasons showed high seasonal variability at all stations and dendrogram delineated two distinct clusters, representing monsoon and non-monsoon seasons. nMDS drawn to group the stations based on salinity showed two distinct groups of stations (viz. estuarine and riverine). Wider separation (in Canonical discriminant analysis) between estuarine and non-estuarine stations of parameters particularly during nonmonsoon seasons with lower DO, high salinity and high COD indicated higher level of pollution during November to March. Chalakudy town and ferry regions of the riverine stations and the estuarine stations showed considerable levels of pollution.

Keywords

Dendrogram Trellis diagram Canonical discriminant analysis Hydrochemical parameters Monsoon Nonmonsoon 

Notes

Acknowledgments

The authors thank Cochin University of Science and Technology for the facilities. The authors also wish to acknowledge the anonymous reviewer for his/her detailed and helpful comments to the manuscript.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • P. Padma
    • 1
  • V. S. Sheela
    • 2
  • S. Suryakumari
    • 3
  • K. V. Jayalakshmy
    • 4
  • S. M. Nair
    • 5
    Email author
  • N. C. Kumar
    • 5
  1. 1.Department of ChemistrySSV CollegePerumbavoorIndia
  2. 2.Department of ChemistryNSS CollegeCherthalaIndia
  3. 3.Department of ChemistrySD CollegeAlappuzhaIndia
  4. 4.National Institute of OceanographyCochinIndia
  5. 5.Department of Chemical Oceanography, School of Marine SciencesCochin University of Science and TechnologyCochinIndia

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