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<p>The spatial distribution of crucial weather parameters, including rainfall, temperature, evapotranspiration, relative humidity, and solar radiation, is changing over time due to the influence of climate change. These parameters play a significant role in hydro-meteorological studies. This study focuses on the Hemavathy project area at Goruru Dam, situated in a semi-arid climate zone with extensive agricultural activities. Covering an agricultural command area of 265,074 hectares, irrigation is facilitated through the left bank canal (LBC) and right bank canal (RBC). Before analysing supply and demand dynamics, the study investigates the spatial variability and trends of key climate variables, such as rainfall and temperature, using statistical methods like the Mann–Kendall test and Sen’s slope estimator for the period 1985–2014. Findings indicate an upward trend in rainfall during annual and pre-monsoon seasons, whereas the monsoon season displays a downward trend near the reservoir, potentially impacting reservoir inflow. Conversely, the lower catchment tail end of the Tumkuru branch canal exhibits an upward rainfall trend. Post-monsoon, rainfall declines across the study area, affecting moisture availability during the Rabi season. Annual maximum temperature shows an upward trend during monsoon, post-monsoon, and winter seasons, except for a downward trend in the pre-monsoon period across the entire study area. These temperature trends are likely to intensify water demand in the region.</p>

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Temporal analysis of climate variables and implications for water resource management: a case study of Hemavathy dam, Hassan district, Karnataka, India

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Radha Krishan,
  • D. V. Thirumalesha,
  • Deepak Khare

摘要

The spatial distribution of crucial weather parameters, including rainfall, temperature, evapotranspiration, relative humidity, and solar radiation, is changing over time due to the influence of climate change. These parameters play a significant role in hydro-meteorological studies. This study focuses on the Hemavathy project area at Goruru Dam, situated in a semi-arid climate zone with extensive agricultural activities. Covering an agricultural command area of 265,074 hectares, irrigation is facilitated through the left bank canal (LBC) and right bank canal (RBC). Before analysing supply and demand dynamics, the study investigates the spatial variability and trends of key climate variables, such as rainfall and temperature, using statistical methods like the Mann–Kendall test and Sen’s slope estimator for the period 1985–2014. Findings indicate an upward trend in rainfall during annual and pre-monsoon seasons, whereas the monsoon season displays a downward trend near the reservoir, potentially impacting reservoir inflow. Conversely, the lower catchment tail end of the Tumkuru branch canal exhibits an upward rainfall trend. Post-monsoon, rainfall declines across the study area, affecting moisture availability during the Rabi season. Annual maximum temperature shows an upward trend during monsoon, post-monsoon, and winter seasons, except for a downward trend in the pre-monsoon period across the entire study area. These temperature trends are likely to intensify water demand in the region.