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Spatio-temporal distribution of water availability in Karnali-Mohana Basin, western Nepal: climate change impact assessment (Part-B)

Author

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  • Pandey, Vishnu Prasad
  • Dhaubanjar, Sanita
  • Bharati, Luna
  • Thapa, Bhesh Raj

Abstract

Study region: Karnali-Mohana river basin, Western Nepal. > Study focus: This study aims to project future climate and assess impacts of climate change (CC) on water availability in the Karnali-Mohana (KarMo) basin. Bias-corrected future climate was projected based on ensembles of multiple models selected from a set of 19 regional climate models (RCMs). The impacts on water availability were then assessed by forcing a well calibrated and validated hydrological model with projected future precipitation (P) and temperature (T) for various climatic scenarios. > New hydrological insights for this region: Results showed that future T is projected to increase spatio-temporally with higher rate for the mountain stations in the winter season; whereas future P has no distinct spatio-temporal trend but increase in dry season precipitation for future periods. The projected changes in P, T and evapotranspiration are expected to alter average annual flow at the outlets of the KarMo and its sub-basins, albeit with varying rate. The simulated results showed higher impacts in water availability at higher altitudes, thus indicating higher vulnerability of northern mountainous region to CC than the southern flatlands. Being the first ever study of such nature in the study area, these results will be useful for planning and development of climate-resilient water development projects in the region.

Suggested Citation

  • Pandey, Vishnu Prasad & Dhaubanjar, Sanita & Bharati, Luna & Thapa, Bhesh Raj, 2020. "Spatio-temporal distribution of water availability in Karnali-Mohana Basin, western Nepal: climate change impact assessment (Part-B)," Papers published in Journals (Open Access), International Water Management Institute, pages 1-29:100691.
    • Handle: RePEc:iwt:jounls:h049744
    DOI: 10.1016/j.ejrh.2020.100691
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    Citations

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    Cited by:

    1. Dipesh Chapagain & Sanita Dhaubanjar & Luna Bharati, 2021. "Unpacking future climate extremes and their sectoral implications in western Nepal," Climatic Change, Springer, vol. 168(1), pages 1-23, September.
    2. Devkota, Laxmi P. & Bhattarai, Utsav & Khatri, Pawan & Marahatta, Suresh & Shrestha, Dibesh, 2022. "Resilience of hydropower plants to flow variation through the concept of flow elasticity of power: Theoretical development," Renewable Energy, Elsevier, vol. 184(C), pages 920-932.
    3. Pandey, Vishnu Prasad & Shrestha, Nirman & Urfels, Anton & Ray, Anupama & Khadka, Manohara & Pavelic, Paul & McDonald, Andrew J. & Krupnik, Timothy J., 2023. "Implementing conjunctive management of water resources for irrigation development: A framework applied to the Southern Plain of Western Nepal," Agricultural Water Management, Elsevier, vol. 283(C).

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