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Bivariate Assessment of Hydrological Drought of a Semi-Arid Basin and Investigation of Drought Propagation Using a Novel Cross Wavelet Transform Based Technique

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Abstract

The advent of climate change has induced frequent occurrence of droughts in the past few decades. Identification of hydrological droughts require computation of drought indices by probabilistic standardization procedures. The existing hydrological drought indices could not answer the zero monthly streamflow condition for the ephemeral streams. This issue was resolved by developing a modified Standardized Streamflow Index to characterize the hydrological drought of Upper Kangsabati River Basin, West Bengal, India. 45 hydrological droughts were extracted for the basin and the most severe drought occurred in the year 2015–2016. The basin experienced the most severe drought of 10.67 severity and longest drought duration of 13 months. A bivariate analysis of drought characteristics was carried out using copula technique to determine different design drought events. The bivariate distribution which showed the basin experienced most severe drought of 16 years and longest duration drought of 15 years ‘OR’ return period. Propagation time of the drought hazard from the meteorological to the hydrological drought is extensively studied in this research using both correlation and Cross Wavelet Transform (XWT) methods. XWT was mostly used for qualitative comparison of hydrological and meteorological signal in drought propagation studies in the past. In this research, a novel quantitative approach of using XWT and the phase angles obtained between the hydrological and meteorological signals is proposed to determine the drought propagation times. It was concluded that the basin had in general a drought propagation time of 2 months. However, there were seasonal variability in the drought propagation times showing prompt response in the summer season which increased to 2 months for monsoons and stretching far to 5 months for the late winter.

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Data Availability

Precipitation and Temperature data are freely available from the website of IMD Pune. The discharge data can be obtained from Irrigation and Waterways department of West Bengal, India on the basis of application.

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Acknowledgements

The Author acknowledges Irrigation and Waterways Department of West Bengal and Central Water Commission for providing the streamflow data required in the study. The authors are grateful to IMD for the precipitation and temperature data.

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The authors declare that no funding was received for conducting this study.

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Suvro Aon formulated the problem, conceptualized the method, collected and assimilated the data, developed the codes, conducted the statistical analysis, and prepared the original draft.

Sujata Biswas contributed in editing the manuscript and supervision.

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Correspondence to Sujata Biswas.

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Aon, S., Biswas, S. Bivariate Assessment of Hydrological Drought of a Semi-Arid Basin and Investigation of Drought Propagation Using a Novel Cross Wavelet Transform Based Technique. Water Resour Manage (2024). https://doi.org/10.1007/s11269-024-03801-3

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  • DOI: https://doi.org/10.1007/s11269-024-03801-3

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