Spatio-Temporal Analysis of Rainfall Variability in Chamarajanagara District, Karnataka

By : K. L. Sowmyashree , B. Chandrashekara , K. Pradeep Kumar

Page No: 92-106

Abstract
Rainfall variability significantly influences water availability, agricultural productivity, and ecosystem stability, making its analysis crucial for sustainable development. This study examines the spatiotemporal distribution of rainfall in Chamarajanagara district, Karnataka, from 1980 to 2023, using statistical and geospatial techniques. The Standardized Precipitation Index (SPI) is applied to assess meteorological drought and wet periods, while the Weibull probability distribution and return period analysis are used to estimate the recurrence intervals of extreme rainfall events. Spatial mapping techniques are employed to visualise changes in rainfall patterns over time, highlighting regions with increasing or decreasing trends. The results indicate substantial rainfall variability across the district, with significant increases in precipitation observed in certain western and southern regions, while eastern and central areas exhibit declining trends. The SPI analysis identifies both drought-prone and wet periods, reflecting shifting monsoon dynamics. Return period calculations reveal the frequency of extreme rainfall events, aiding in disaster risk assessment. The study underscores the need for sustainable water management, improved irrigation infrastructure, and climate adaptation strategies to mitigate the effects of fluctuating precipitation. These findings provide valuable insights for policymakers, agricultural planners, and water resource managers in formulating climate-resilient strategies for the region.

Author:
K. L. Sowmyashree, Guest Lecturer, DOS in Geography, University of Mysore, Manasagangothri, Mysore.
B. Chandrashekara Senior Professor, DOS in Geography, University of Mysore, Manasagangothri, Mysore.
K. Pradeep Kumar Guest Lecturer, Dept. of Geography, Maharaja’s College, University of Mysore, Mysore
 

DOI: https://doi.org/10.32381/ATNAGI.2026.46.01.6