Effect of climate change on land suitability for surface irrigation and irrigation potential of the shallow groundwater in Ghana

摘要: Abstract Estimating the potential land resources suitable for irrigation and evaluating possible impact of climate change on suitability is essential planning a sustainable agricultural system. This study applied GIS-based Multi-Criteria Evaluation (MCE) technique to evaluate in Ghana baseline period (1990 2010) future time horizons 2050s (2041 2060) 2070s (2061 2080). Key factors considered include biophysical features (such as climate, use, soil, slope) socioeconomic proximity roads population density). These were weighted using pairwise comparison matrix then reclassified overlaid 30 m grid estimate country. Groundwater data from British Geological Survey (BGS) superimposed onto map layer accessibility shallow groundwater with simple water lifting technologies. Downscaled bias-corrected HadGEM2-ES under Representative Concentration Pathways (RCP) 4.5 emission scenario used represent horizon. Due change, average, rainfall will increase by 15 mm 20 mm 2070s, respectively. The average temperature shows consistent majority higher rate expected 2070s. Consequently, rising evapotranspiration 6.0% 7.6% analysis indicates that approximately 9% country surface period. A large portion located southwestern part has an access 12 m borehole yield 2.5 L/second, which makes it favorable utilization 9.5% become unfavorable 2050s, reach 17%