Bothra et al. (2026) Spatiotemporal Characterization of Drought and Flood Extremes Across Assam Using Multi-Scale Standardized Precipitation Index (1901–2024)

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Identification

• Journal: Current World Environment
• Year: 2026
• Date: 2026-09-10
• Authors: Nitesh Bothra, Surobhi Deka
• DOI: 10.12944/cwe.21.2.19

Research Groups

• Department of Geography, Gauhati University
• Indian Institute of Technology Guwahati (IITG)
• National Centre for Hydrology and Water Resources (NCHHR), India

Short Summary

This study provides a century-scale analysis of droughts and floods in Assam, Northeast India, using 124 years of rainfall data to understand the spatial and temporal characteristics of hydroclimatic extremes.

Objective

• Investigate the spatiotemporal patterns of droughts and floods in Assam, considering both short-term and long-term events.

Study Configuration

• Spatial Scale: District-level analysis across 21 districts of Assam.
• Temporal Scale: Century-scale analysis (1901–2024) with a focus on monthly rainfall data.

Methodology and Data

• Models used: Standardized Precipitation Index (SPI) approach, based on empirical cumulative distribution functions.
• Data sources: Monthly rainfall data from 124 years (1901–2024).

Main Results

• Strong scale dependence of hydroclimatic extremes, with short-term events occurring more frequently but lasting less, while long-term events are rarer yet more severe and persistent.
• Spatial disparities in drought and flood frequency, duration, magnitude, intensity, and severity across different districts.

Contributions

• Provides a robust century-scale baseline for drought and flood risk assessment in Assam.
• Offers district-level insights crucial for disaster preparedness, water resources management, agricultural planning, and responses to climate change.

Funding

• This research was supported by the Indian National Science Academy (INSA) [grant number: INSA/2020/01].
• Funded by the Department of Science and Technology (DST), Government of India [project code: DST/SERB/2020/001].

Citation

@article{Bothra2026Spatiotemporal,
  author = {Bothra, Nitesh and Deka, Surobhi},
  title = {Spatiotemporal Characterization of Drought and Flood Extremes Across Assam Using Multi-Scale Standardized Precipitation Index (1901–2024)},
  journal = {Current World Environment},
  year = {2026},
  doi = {10.12944/cwe.21.2.19},
  url = {https://doi.org/10.12944/cwe.21.2.19}
}