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<p>Climate changes are inevitable, underscored by a growing populace and the concurrent expansion of infrastructure. The consequences extend from the local scale to the global necessitating a thorough investigation of local scale variation to devise appropriate measures. Therefore, this study is undertaken to scrutinize climatic variability within the West Rapti River Basin (WRRB) in Nepal for a forty-two-year period of 1981–2022. The spatio-temporal variation in mean monthly temperature and annual precipitation (as crucial parameters of climate) is studied annually, seasonally and monthly using the homogeneity test and trend analysis. The results are produced station wise and then reproduced in the map form for the WRRB. The findings indicate a notable rise of 2.7&#xa0;mm per year in precipitation alongside a slight descend of 0.09&#xa0;°C per year in temperature. The annual variation remarkably shows a significantly positive trend for precipitation, while temperature portrays a negative trend. The pre-monsoon and monsoon seasons show negative trends with acceptable significance in case of temperature whereas considering precipitation all seasons except winter show a substantially positive trend. Despite a decreasing trend in temperature, January and December display a positive change in trend contrasted by a negative trend in precipitation for the same months. The sub-basins lying in the eastern side exhibit high variability in case of precipitation, whereas the variability is high in sub-basins on the western side in case of temperature. This study revealed that the mean monthly temperature and annual precipitation trend is quite opposite to that of the global. This local scale variation has a significant impact on the livelihood of indigenous people, water resource management, and their adaptation strategies. Consequently, this study’s insights are pivotal for informing climate policy formulation in a Nepal’s context emphasizing the need for a tailored regulatory framework to address the region’s distinct climate change.</p>

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Exploring Local Scale Climatic Variability in West Rapti River Basin, Nepal

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Shiva Kant Dube,
  • Narendra Kumar Rana,
  • Lucky Sharma

摘要

Climate changes are inevitable, underscored by a growing populace and the concurrent expansion of infrastructure. The consequences extend from the local scale to the global necessitating a thorough investigation of local scale variation to devise appropriate measures. Therefore, this study is undertaken to scrutinize climatic variability within the West Rapti River Basin (WRRB) in Nepal for a forty-two-year period of 1981–2022. The spatio-temporal variation in mean monthly temperature and annual precipitation (as crucial parameters of climate) is studied annually, seasonally and monthly using the homogeneity test and trend analysis. The results are produced station wise and then reproduced in the map form for the WRRB. The findings indicate a notable rise of 2.7 mm per year in precipitation alongside a slight descend of 0.09 °C per year in temperature. The annual variation remarkably shows a significantly positive trend for precipitation, while temperature portrays a negative trend. The pre-monsoon and monsoon seasons show negative trends with acceptable significance in case of temperature whereas considering precipitation all seasons except winter show a substantially positive trend. Despite a decreasing trend in temperature, January and December display a positive change in trend contrasted by a negative trend in precipitation for the same months. The sub-basins lying in the eastern side exhibit high variability in case of precipitation, whereas the variability is high in sub-basins on the western side in case of temperature. This study revealed that the mean monthly temperature and annual precipitation trend is quite opposite to that of the global. This local scale variation has a significant impact on the livelihood of indigenous people, water resource management, and their adaptation strategies. Consequently, this study’s insights are pivotal for informing climate policy formulation in a Nepal’s context emphasizing the need for a tailored regulatory framework to address the region’s distinct climate change.