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<p>The increasing intensity and frequency of droughts under changing climatic conditions have raised serious concerns for sustainable water resource management. It is vital to understand the propagation of different types of drought and its characteristics. Meteorological and hydrological drought dynamics in Southern Odisha, India, were investigated using long-term (1987–2021) hydro-climatic data. Monthly data from four hydrometric stations namely Kesinga, Murthandi, Saradaput and Nabarangapurof streamflow, precipitation and maximum-minimum temperature were analysed to quantify drought frequency, duration, severity and to explore drought propagation mechanisms. Meteorological drought indices like Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were estimated to determine the dry and wet meteorological periods. Standardized Streamflow Index (SSFI)was also estimated to determine the hydrological drought. Correlation and cross over correlation analyses revealed strong linkages between the meteorological and hydrological droughts, at Kesinga and Nabarangapur stations with correlation coefficient (<i>r</i> &gt; 0.8) at 12 and 24 months’ timescales. There is a frequent occurrence of mild hydrological drought in longer timescale at all the four stations. An exponential relationship between meteorological and hydrological drought was observed in terms of duration and magnitude. The most notable events are SPI-12 (42 months, severity 52.24), SPEI-12 (54 months, severity 66.04), and SSFI-12 (65 months, severity 74.6). A broader understanding of drought characteristics can be attained by incorporating numerous elements that impact and trigger the intensity of drought by using several indices that characterize diverse components related to hydrological cycle.</p>

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Hydro-meteorological drought variability: a comparative study in southern Odisha

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Samikshya Panda,
  • Vinod Kumar Tripathi,
  • Vijay Shankar Yadav

摘要

The increasing intensity and frequency of droughts under changing climatic conditions have raised serious concerns for sustainable water resource management. It is vital to understand the propagation of different types of drought and its characteristics. Meteorological and hydrological drought dynamics in Southern Odisha, India, were investigated using long-term (1987–2021) hydro-climatic data. Monthly data from four hydrometric stations namely Kesinga, Murthandi, Saradaput and Nabarangapurof streamflow, precipitation and maximum-minimum temperature were analysed to quantify drought frequency, duration, severity and to explore drought propagation mechanisms. Meteorological drought indices like Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were estimated to determine the dry and wet meteorological periods. Standardized Streamflow Index (SSFI)was also estimated to determine the hydrological drought. Correlation and cross over correlation analyses revealed strong linkages between the meteorological and hydrological droughts, at Kesinga and Nabarangapur stations with correlation coefficient (r > 0.8) at 12 and 24 months’ timescales. There is a frequent occurrence of mild hydrological drought in longer timescale at all the four stations. An exponential relationship between meteorological and hydrological drought was observed in terms of duration and magnitude. The most notable events are SPI-12 (42 months, severity 52.24), SPEI-12 (54 months, severity 66.04), and SSFI-12 (65 months, severity 74.6). A broader understanding of drought characteristics can be attained by incorporating numerous elements that impact and trigger the intensity of drought by using several indices that characterize diverse components related to hydrological cycle.