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Plant Science Today (PST)

Research Articles

Early Access

Analysis of seasonal variations and trends in rainfall patterns of the Aliyar sub-basin

DOI
https://doi.org/10.14719/pst.7888
Submitted
23 February 2025
Published
04-06-2025
Versions

Abstract

Climate change is a major issue around worldwide caused by anthropogenic activities, leading to changes in climatic parameters such as rainfall, temperature and other hydrometeorological events. Assessing regional rainfall pattern changes is essential for effective water management and agricultural planning. Rainfall data obtained from the India Meteorological Department (IMD) dataset was analysed to determine the annual and seasonal trends from 1981 to 2023. This study investigated the trends and change point analysis of rainfall data for 43 years in the Aliyar sub-basin. The analysis was carried out by using Mann-Kendall (MK), Modified Mann-Kendall (MMK), Innovative Trend Analysis (ITA) and Innovative Polygon Trend Analysis (IPTA) methods. Pettit’s test was used to assess the data homogeneity. The result showed that the mean annual rainfall of the sub-basin is 1421.65 mm, with a significant increase in rainfall pattern per year. Seasonal analysis revealed a consistent increasing trend across all seasons with the southwest monsoon season showing the major rainfall contribution in that region. A notable shift in the annual rainfall was observed in 2004, highlighting the impact of climate change. The findings give valuable insights into planning of water resource management practices and planting of short duration crops with rice-based cropping systems and controlled soil loss measures at the regional level and underscore the need for sustainable agriculture production by proper irrigation management strategies to alleviate the effects of climate change in the sub-basin.

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