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Complexity analyses of Godavari and Krishna river streamflow using the concept of entropy

  • Research Article - Hydrology
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Abstract

The hydrological regime in both the Godavari and Krishna River has been altered due to both human-induced and environmental changes. The present study utilizes the sample entropy and its more generalized approach known as multiscale entropy to investigate the temporal and spatial distribution of complexity and quantify them using SampEn values. Daily streamflow for five stations, three from Godavari River (Dhalegaon, Nowrangpur, and Polavaram), and two from Krishna River (Yadgir and K. Agraharam), was analysed for the complexity analyses. Trends in the streamflow for the selected gauging stations and their annual entropy values have also been evaluated using the Mann–Kendall test. The trend results revealed that three (Dhalegaon and Nowrangpur in Godavari basin and Yadgir in Krishna basin) out of five stations showed significant decreasing trends for both monthly and annual streamflow series. The declining trend in streamflow could be attributed to both anthropogenic (reservoir operation, increased water abstraction, etc.) and climatic (change in monsoon rainfall, temperature, etc.) factors. The most significant reduction in annual streamflow during the post-impact period was observed at Dhalegaon station in Godavari Basin (from 53,573 to 19,555 m3/s) signifying maximum alteration in annual flow regime. The entropy analysis results of streamflow showed that there was obvious spatial and temporal variation in the complexity, as indicated by the annual SampEn values. Although not profound, a negative correlation exists between the annual runoff and SampEn values (highest − 0.42 at K. Agraharam) and hence a reverse correspondence exists between them. In MSE analysis, the original streamflow series increased with time scale (up to 30 days was chosen for this study), whereas entropy decreased with an increased time scale. Due to the fully operational state of the dams upstream of the gauging stations, the entropy values during the post-impact period were less the pre-impact period. The present study can be used as a scientific reference to use information science to detect hydrologic alterations in the river basins. Future studies should focus on considering both climatic and land-use changes in conjunction with the human-induced changes for more comprehensive river system disorder analysis.

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Acknowledgements

No specific grant was received from any funding agencies belonging to commercial, public, or not-for-profits sectors for this research. However, authors are very thankful to the Indian Institute of Technology Roorkee, India, for providing the necessary resources to conduct this research and the Ministry of Human Resources, Govt. of India, for supporting the first author through Senior Research Fellowship.

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  1. Department of Hydrology, Indian Institute of Technology, Roorkee, India

    Rahul Kumar Singh & Manoj Kumar Jain

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  1. Rahul Kumar Singh
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Correspondence to Rahul Kumar Singh.

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Communicated by Prof. Senlin Zhu (ASSOCIATE EDITOR), Dr. Michael Nones (CO-EDITOR-IN-CHIEF).

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Singh, R.K., Jain, M.K. Complexity analyses of Godavari and Krishna river streamflow using the concept of entropy. Acta Geophys. 69, 2325–2338 (2021). https://doi.org/10.1007/s11600-021-00660-z

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