Assessment of climate change impact on hydro-climatic variables and its trends over Gidabo Watershed

Envisaging the actual evapotranspiration and elucidating its effects under climate change scenarios on agrarian lands of bilate river basin in Ethiopia

“…In contrast to the evident decrease in mean annual AET during the computed periods and projected RCPs for the next decades, maximum evapotranspiration shows an increment. Most previous studies on Ethiopia's river basin focused on temporal variations in rainfall-runoff, groundwater recharge, surface water availability and evaluation on past AET (Dile et al, 2018;Kahsay et al, 2018;Alehu et al, 2021;Bekele et al, 2019;Molla et al, 2019;Belihu et al, 2020;Sulamo et al, 2021). The current research strongly advocates at the spatial distribution of AET across seven land cover classes and climate change scenarios.…”

“…The biascorrected results from the CORDEX climate model ensemble mean show a decrease in annual precipitation and actual evapotranspiration for the study area under both the RCPs, even though seasonal changes do not always show up in the same direction, all models predicted higher temperatures in the future (Figure 13). According to a few climate change studies for Ethiopia, the predicted changes in precipitation and temperature are comparable (Alehu et al, 2021).…”

“…The primary reason for increasing maximum actual evapotranspiration changes in the seasonal distribution, intensity, and duration of rainfall, as well as a rise in temperature, all of which are significant changes in the water regime in Ethiopia's Bilate river. Urbanization and agricultural land showed clear expansion trends in Ethiopia's Bilate basin (Mathewos et al, 2019;Alehu et al, 2021;Sulamo et al, 2021). As a result, between 1989 and 2019, agricultural land and settlement in this area increased dramatically with determined values of 1460.3 km 2 (27%) and 131.5 km 2 (2.4%) (Nannawo et al, 2021).…”

“…The maximum temperature in Ethiopia's Addis Ababa area would rise to 2.06 C (CGCM3A2) by 2080, while the minimum temperature would be 1.03 C (Feyissa, 2018). According to Alehu et al (2021) the 2020s, 2050s, and 2080s estimates a decrease in rainfall amount in all months, particularly in February and May, in the Rift valley's Gidabo catchment, under both RCP's emission scenarios. The continual rise in air temperature compared to the pre-industrial age due to global warming will have an impact on AET (Dimitriadou and Nikolakopoulos, 2021).…”

Assessing impacts of future climate on the crop water requirement and growth period. A case of Lake Hawassa watershed, Ethiopia

“…models and their scenarios in the Representative Concentration Pathways (RCP). The evaluation and application of CORDEX outputs were widely reported for the water resource impact assessment in Ethiopia (Ashaley et al 2020;Tesfaye et al 2020;Alehu et al 2021;Asnake et al 2021;Mengistu et al 2021).…”