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Evaluating Land Suitability for Surface Irrigation Under Changing Climate in Gardulla Zone, Southern Ethiopia

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  • Shako K. Kebede

    (Geography and Environmental Studies Department, Jinka University, Jinka P.O. Box 165, Ethiopia
    Geospatial Information Science (GIS) Department, Wondo Genet College of Forestry and Natural Resources, Hawassa University, Hawassa P.O. Box 5, Ethiopia)

  • Zemede M. Nigatu

    (Geospatial Information Science (GIS) Department, Wondo Genet College of Forestry and Natural Resources, Hawassa University, Hawassa P.O. Box 5, Ethiopia)

  • Haimanot Aklilu

    (Geospatial Information Science (GIS) Department, Wondo Genet College of Forestry and Natural Resources, Hawassa University, Hawassa P.O. Box 5, Ethiopia)

Abstract

Climate change substantially affects water resources and agriculture, highlighting the critical importance of assessing land suitability for surface irrigation. This study was initiated with the objective of assessing the present and future land suitability for surface irrigation in the Gardulla Zone of Southern Ethiopia, utilizing meteorological, topography, soil, land cover, and proximity data. The analytic hierarchy process and weighted overlay analysis were employed to assign factor weights, while future climate projections were downscaled via a statistical downscaling model (SDSM4.2) under the shared socio-economic pathways (i.e., SSP2-4.5 and SSP5-8.5) scenarios. Irrigation suitability mapping was performed via inverse distance-weighted interpolation. The results revealed that 8% of the area is highly suitable, 54.3% is moderately suitable, 30% is marginally suitable, and 2.3% is unsuitable under current climate conditions. In the future periods, under both SSP scenarios, highly suitable land increases (up to 9.7% and 10.3% by 2050s and 10.8% and 13.5% by the 2080s under SSP2-4.5 and SSP5-8.5, respectively), whereas unsuitable land decreases (down to 0.6% by 2080s under SSP5.8.5). In terms of area, highly to moderately suitable land expanded by 1357.6–6867.7 ha, depending on the scenario and timeframe. The study concludes that climate change is expected to affect the suitability of land for surface irrigation potential in the study area and similar hydroclimatic settings, highlighting the need for forward-looking policies and adaptation options. Therefore, it is recommended to promote climate-smart irrigation systems by integrating site-specific suitability mapping into regional land-use planning and prioritizing investment in small-scale, community-managed surface irrigation schemes that reduce water losses and ensure long-term agricultural sustainability.

Suggested Citation

  • Shako K. Kebede & Zemede M. Nigatu & Haimanot Aklilu, 2025. "Evaluating Land Suitability for Surface Irrigation Under Changing Climate in Gardulla Zone, Southern Ethiopia," Sustainability, MDPI, vol. 17(18), pages 1-25, September.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:18:p:8165-:d:1746795
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    References listed on IDEAS

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