Spatio-temporal hydro-climate variability in Omo-Gibe river Basin, Ethiopia

Spatio-temporal variability and trends of hydroclimatic variables at Zarima Sub-Basin North Western Ethiopia

“…for S > 0 decreasing trend (Du et al, 2013;Hamlaoui-Moulai et al, 2013;Alemu and Bawoke, 2019;Anose et al, 2021;Bayable et al, 2021).…”

“…SAI with negative values representing periods of below normal rainfall (dry) while positive values reflect above normal rainfall (wet) Table (Muthoni et al, 2019;Anose et al, 2021). For temperature value below long-term mean was dominated considered as cooling period while above long-term average was most persistent is considered as warming period (WMO, 2016).…”

“…This finding is in line with the study at the Awash River basin, the annual rainfall showed low variability whereas seasonal rainfall exhibited low to high variability which has a significant effect on agricultural production (Gebre et al, 2013); mean annual rainfall was less variable during Kiremit season which showed less to moderate variability in Central highland of Ethiopia (Alemayehu and Bewket, 2017) High variability in Belg rainfall affect the availability of water and create unfavorable condition for crop growth which directly affect agricultural production and food security (Kassie et al, 2014). The variation of rainfall in the subbasin could be caused by global atmospheric circulation forcing and regional features such as topography, modification of land use and land cover change and water bodies (Zeleke et al, 2013;Anose et al, 2021). According to the results, the agricultural activities in the subbasin are significantly impacted by the high seasonal rainfall variability.…”

“…These unmitigated hydroclimatic variability and change can increases poverty rates by about 25 percent and costs 38 percent of potential economy growth (Jaweso et al, 2019;Curtis, 2020). Accordingly, the country struggling to achieve the food security and reduce poverty with climate variability adaptation and mitigation strategies (Gari and Chukala, 2020;Anose et al, 2021;Bayable et al, 2021).…”

“…Therefore, it's crucial to detect the historical seasonal and interannual variability and trend analysis of hydroclimatic variables (rainfall, temperature and stream flow) at regional and local scales to depict the response of subbasin to hydroclimatic variability and to develop more effective responsive strategies to manage climate induced risks (Mahmood et al, 2019;Anose et al, 2021) for better management and allocation of water resources for future sustainable water resource management (Daba et al, 2020;Etana et al,2020;Getahun et al, 2021;Orke and Li, 2021). Hence, different watershed based hydroclimatic parameters variability and trend analysis was conducted in Ethiopia.…”