Preprint Article Version 1 NOT YET PEER-REVIEWED

Estimation of Chlorophyll‐a Concentration and Trophic States for an Inland Lake from Landsat 8 OLI Data: A Case of Nalban Lake of East Kolkata Wetland, India

  1. Department of Aquatic Environment Management, Faculty of Fishery Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata-700094, India
  2. ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata-700120, India
Version 1 : Received: 14 August 2016 / Approved: 15 August 2016 / Online: 15 August 2016 (13:51:19 CEST)

How to cite: Patra, P.; Dubey, S.; Kumar Trivedi, R.; Kumar Sahu, S.; Keshari Rout, S. Estimation of Chlorophyll‐a Concentration and Trophic States for an Inland Lake from Landsat 8 OLI Data: A Case of Nalban Lake of East Kolkata Wetland, India. Preprints 2016, 2016080149 (doi: 10.20944/preprints201608.0149.v1). Patra, P.; Dubey, S.; Kumar Trivedi, R.; Kumar Sahu, S.; Keshari Rout, S. Estimation of Chlorophyll‐a Concentration and Trophic States for an Inland Lake from Landsat 8 OLI Data: A Case of Nalban Lake of East Kolkata Wetland, India. Preprints 2016, 2016080149 (doi: 10.20944/preprints201608.0149.v1).

Abstract

1) Landsat operational land imager (OLI) data and consequent laboratory measurements were used to predict Chlorophyll-a (Chl-a) concentration and the trophic states for an inland lake within the East Kolkata Wetland, India; 2) The most suitable band ratio was identified by performing Pearson correlation analysis between Chl-a concentrations and possible OLI band and band ratios from the study points; 3) The results showed highest correlation coefficient from the band ratio OLI5/OLI4 with an R value of 0.85. The prediction model was then developed by applying regression analysis between the band ratio OLI5/OLI4 and Chl-a concentration of the study points. The reflectance ratios of the validation points were given as input on the prediction model and the model output was considered as predicted Chl-a values of the validation points to check the efficiency of the prediction model. The regression model between laboratory-derived Chl-a value and model-fitted Chl-a value of the validation points revealed a high correlation with an R2 value of 0.78. Trophic State Index (TSI) of the lake was also calculated from laboratory-derived Chl-a value and model-fitted Chl-a value of the validation points. The study presented a high correlation of TSI determined from predicted data with TSI from laboratory reference data (R = 0.88). The TSI values of the lake ranged from 65 to 75 which indicate that the lake is appeared to be eutrophic to hypereutrophic conditions. 4) This empirical study showed that Landsat 8 OLI imagery can be effectively applied to estimate Chl-a levels and trophic states for inland lakes.

Subject Areas

landsat 8 OLI; Nalban Lake; East Kolkata Wetland; chlorophyll-a prediction; study points; validation points

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