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Rating curve based assessment of seasonal variability of sulfate in streamflow

Environmental Monitoring and Assessment volume 190, Article number: 493 (2018) Cite this article

Abstract

Though constituent concentrations and loads in rivers exhibit apparent seasonal fluctuations, they are characterized by event-driven nature of the fluctuations in respond to natural processes and seasonal anthropogenic activities. This study aimed at establishing relationship between streamflow and sulfate load in Gin River, the major water source in southern Sri Lanka and assessing seasonal sulfate levels in the streamflow following monsoon pattern and cultivation seasons. Rating curve, a load-streamflow regression model, was developed using adjusted maximum likelihood estimation. Following the assumptions of model fit, the regression model showed low correlation among explanatory variables and good empirical agreement with the measured data exhibiting its applicability to deduce sulfate loads from streamflow data, during non-sampling periods. Sulfate loads, highly dependent on streamflow, peaked annually in April–June (south-west monsoon contributing to Yala cultivation season) and October–December (north-east monsoon contributing to Maha cultivation season), following the bimodal monsoon pattern in the catchment. Median sulfate load exhibited fourfold increase from the lowest value 8,888 kg/day in August (non-cultivation season) to the highest value 38,185 kg/day in November (Maha cultivation season), despite the twofold increase of median streamflow between the two months. Flow-weighted sulfate concentrations showed varying flow dependence attributed to the seasonality. At low streamflows (above 70th percentile), sulfate concentration and streamflow were inversely related and at high streamflows (below 30th percentile), and sulfate concentration and streamflow were directly related. Elevated sulfate concentrations attributed to less soluble sulfate irons were clearly evident during the two cultivation seasons which coincided with the monsoon periods.

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Acknowledgements

The author gratefully acknowledges National Water Supply and Drainage Board, Sri Lanka for providing data for the study.

Funding

The study received financial support from University of Ruhuna, Sri Lanka.

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  1. Department of Civil & Environmental Engineering, Faculty of Engineering, University of Ruhuna, Hapugala, Galle, Sri Lanka

    Thushara Navodani Wickramaarachchi

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  1. Thushara Navodani Wickramaarachchi
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Correspondence to Thushara Navodani Wickramaarachchi.

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Wickramaarachchi, T.N. Rating curve based assessment of seasonal variability of sulfate in streamflow. Environ Monit Assess 190, 493 (2018). https://doi.org/10.1007/s10661-018-6863-4

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  • DOI: https://doi.org/10.1007/s10661-018-6863-4

Keywords

  • Concentration
  • Load
  • LOADEST
  • Seasonal variability
  • Streamflow
  • Sulfate