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Spatiotemporal evaluation of drought characteristics based on standard drought indices at various timescales over Uttar Pradesh, India

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Abstract

Prolonged and repeated drought, as seen in India and other parts of South Asia, is a symptom of climate change, which is partially the result of human interventions. The performance of the widely used drought metrics Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) are evaluated for 18 stations in Uttar Pradesh state for the period 1971 to 2018 in this study. Drought characteristics such as intensity, duration, and frequency of different categories are estimated and compared based on SPI and SPEI. In addition, station proportion is estimated at a different timescales, providing a better insight into temporal variability drought of a specific category. Spatiotemporal trend variability of SPEI and SPI was investigated at a significance level of 0.05 using the non-parametric Mann–Kendall (MK) test. SPEI adds the effect of temperature rise and deficit change on the drought occurrences of different classes. SPEI provides a better estimation of drought characteristics due to its consideration of temperature change in the drought severity. The more significant number of drying events accounted for a timescale of 3 months and 6 months, reflecting the higher variability of the seasonal fluctuation of water balance over the state. At 9-month and 12-month timescales, SPI and SPEI fluctuate gradually with considerable differences between the duration and severity of the drought event. This study reveals that there have been a substantial number of drought events over the state during the last two decades (2000 to 2018). The results conclude that the study area is at risk of erratic meteorological drought conditions where the western part of the study is worst affected compared to the eastern part of Uttar Pradesh (India).

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Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

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  1. Dept. of Civil Engineering, Indian Institute of Technology (BHU), Varanasi, Uttar Pradesh, 221005, India

    Shivani Gond & P. K. S. Dikshit

  2. Dept. of Civil Engineering, Institute of Technology, Nirma University, Ahmedabad, Gujarat, 382481, India

    Nitesh Gupta

  3. Dept. of Civil Engineering, Samrat Ashok Technological Institute (SATI), Vidisha, Madhya Pradesh, 464001, India

    Jitendra Patel

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Gond, S., Gupta, N., Patel, J. et al. Spatiotemporal evaluation of drought characteristics based on standard drought indices at various timescales over Uttar Pradesh, India. Environ Monit Assess 195, 439 (2023). https://doi.org/10.1007/s10661-023-10988-2

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