Estimation of Trophic State Index of Chilika Lake using Landsat-8 OLI and LISS-III satellite data

Abstract

Trophic State Index (TSI) of the Chilika Lake has been estimated using secchi disk transparency (SDT) as well as satellite data. An algorithm was developed to estimate TSI using in-situ observed SDT and band ratio of Landsat-8 OLI in exponential mode (R² = 0.72). Different interpolation methods have been applied and the best one was considered to prepare two dimensional water quality images of the lake. The in-situ and satellite observed, TSI value shows the northern sector is always in eutrophic to hypereutrophic condition. During pre-monsoon season of 2015 the southern sector shows lake water is eutrophic condition. The analysis of satellite image indicate the lake water is in eutrophic condition from the year 2006 to 2015. However, the average TSI values were comparatively less during post-monsoon season of 2013 and 2015.

Keywords:

• Interpolation
• LISS-III
• Landsat-8 OLI
• secchi disk transparency
• Trophic state index

Acknowledgements

The authors are acknowledging the financial assistance supported by the University Grants Commission (UGC), Government of India in terms of Research Fellowship. We are also grateful to Director, IIRS for providing all support and encouragement to carry out research activity. Authors, thankful to Professor, Dr. (Mrs.) Pritirekha Daspattanaik, Head, Dept of Geography, Ravenshaw University, Cuttack and Dr. (Mrs.) Ranjana Bajpai, Associate Professor in Geography, Ravenshaw University, Cuttack. We are special thankful to Dr. C. R. Panda, Scientist-G, Head, Department of Environment Sustainability, Institute of Minerals Material Technology (IIMT), CSIR, Bhubaneswar, Odisha for providing all support and laboratory facility to carry out research activity. Authors, gratefully acknowledge Earth Explorer (USGS) and NRSC for providing the Landsat-8 and LISS-III data. The authors thankful to anonymous reviewers for their insightful comments and suggestions which are helped to improve the quality of manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.