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001-es BibID:	BIBFORM123409
Első szerző:	Chakilu, Gashaw Gismu
Cím:	The patterns of potential evapotranspiration and seasonal aridity under the change in climate in the upper Blue Nile basin, Ethiopia / Gashaw Gismu Chakilu, Szegedi Sándor, Túri Zoltán, Kwanele Phinzi
Dátum:	2024
ISSN:	0022-1694
Megjegyzések:	Evapotranspiration is one of the determinant components of the hydrological process, highly influenced by climate change due to the increase in atmospheric temperature at global and regional scales. This study was designed to evaluate the extent to which climate change affects the Potential Evapotranspiration (PET) and the consequent Aridity Index (AI) in the high-emission scenario of Representative Concentration Pathways (RCPs) in the Gilgel Abay, Ribb, Gumara, and Megech watersheds using six Global Climate Models in the 2011-2040, 2041-2070, and 2071-2100 relative to the 1971-2000 (baseline period). The average PET is simulated using the Soil Water Assessment Tool (SWAT) model. Penman-Monteith and Hargreaves methods were used in the computation of PET using the water balance technique, and the Hargreaves method was found more efficient in calibration and validation processes. The Aridity Index (AI) of watersheds is calculated using the ratio of precipitation and potential evapotranspiration. The study revealed that the change in annual average PET is showing an increasing pattern in the three time periods, and the highest rate of changes in Megech, Gilgel Abay, Ribb, and Gumara, watersheds are 16.66%, 15.53%, 14.68%, and 13.46%, respectively in the 2071-2100 time period. Seasonally, the highest rate of change in PET is 20.37% (September), 19.29% (April), 17.46% (March), and 17.02% (March) in the Megech, Gilgel Abay, Ribb, and Gumara, respectively. Similarly, the seasonal highest change in Aridity Index (AI) is also likely to be observed in the 2071-2100 in which in the dry season, it accounts -0.303 (March), -0.299 (March), -0.285 (April), and -0.276 (April) in the Ribb, Gumara, Gilgel Abay, and Megech, respectively, whereas in the rainy season, the change is 0.263, 0.258, 0.238, and 0.211 in the Gilgel Abay, Gumara, Ribb, and Megech, respectively. In general, due to the rising atmospheric temperature, the amount of moisture during dry seasons in the headwater catchments of the upper Blue Nile basin is expected to deplete in the 21st century. Therefore, it is highly recommended to use different climate change adaptation mechanisms including adopting suitable physical and biological water conservation techniques to enhance the amount of water stored in the subsurface and joining the groundwater during the rainy season.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk climate change potential evapotranspiration aridity index Upper Blue Nile Ethiopia
Megjelenés:	Journal of Hydrology. - 641 (2024), p. 1-12. -
További szerzők:	Szegedi Sándor (1970-) (klimatológus) Túri Zoltán (1980-) (geográfus) Phinzi, Kwanele (1989-)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM106749
035-os BibID:	(cikkazonosító)358 (Scopus)85146798477
Első szerző:	Chakilu, Gashaw Gismu
Cím:	The Dynamics of Hydrological Extremes under the Highest Emission Climate Change Scenario in the Headwater Catchments of the Upper Blue Nile Basin, Ethiopia / Gashaw Gismu Chakilu, Szegedi Sándor, Túri Zoltán
Dátum:	2023
ISSN:	2073-4441
Megjegyzések:	Climate change and its impact on surface runoff in the upper Blue Nile basin and sub-basins have been widely studied in future climate projections. However, the impact on extreme flow events of rivers is barely investigated discretely. In this paper, the change in temperature and rainfall under the Representative Concentration Pathway (RCP) highest emission scenario (RCP 8.5) and its impact on the high flow and low flow simulated by the Soil and Water Assessment Tool (SWAT 2012) in major watersheds of the Lake Tana Basin has been evaluated by comparing the baseline period (1971-2000) with the 2020s (2011-2040), 2050s (2041-2070), and 2080s (2071-2100). The high flows of watersheds were selected by the Annual Maximum Series (AMS) model, whereas the low-flow watersheds were selected by the 7-day sustained mean annual minimum flow method. The result showed that the highest change in maximum temperature ranged from 2.93 ?C to 5.17 ?C in monthly time scales in the 2080s. The increment in minimum temperature is also more prominent in the 2080s and it is expected to rise by 4.75 ?C. Inter-annual variability of the change in rainfall has shown increasing and decreasing patterns. The highest increments are expected by 22.37%, 25.58%, and 29.75% in the 2020s, 2050s, and 2080s, respectively, whereas the projected highest decrease in rainfall dictates the decrease of 6.42%, 7.11%, and 9.26% in 2020s, 2050s, and 2080s, respectively. Due to changes in temperature and rainfall, the low flow is likely to decrease by 8.39%, 8.33%, 6.21%, and 5.02% in Ribb, Gumara, Megech, and Gilgel Abay watersheds, respectively, whereas the high flow of Gilgel Abay, Megech, Gumara, and Ribb watersheds are expected to increase by 13.94%, 12.16%, 10.90%, and 10.24%, respectively, every 30 years.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk climate change high flow low flow SWAT upper Blue Nile basin
Megjelenés:	Water. - 15 : 2 (2023), p. 1-20. -
További szerzők:	Szegedi Sándor (1970-) (klimatológus) Túri Zoltán (1980-) (geográfus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM102813
035-os BibID:	(cikkazonosító)101175 (WoS)000854013600003 (Scopus)85134573015
Első szerző:	Chakilu, Gashaw Gismu
Cím:	Climate change and the response of streamflow of watersheds under the high emission scenario in Lake Tana sub-basin, upper Blue Nile basin, Ethiopia / Gashaw Gismu Chakilu, Szegedi Sándor, Túri Zoltán, Kwanele Phinzi
Dátum:	2022
ISSN:	2214-5818
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Journal of Hydrology-Regional Studies. - 42 (2022), p. 1-16. -
További szerzők:	Szegedi Sándor (1970-) (klimatológus) Túri Zoltán (1980-) (geográfus) Phinzi, Kwanele (1989-)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM088959
035-os BibID:	(WoS)000594907900001 (Scopus)85095970567
Első szerző:	Chakilu, Gashaw Gismu
Cím:	Change in Stream Flow of Gumara Watershed, upper Blue Nile Basin, Ethiopia under Representative Concentration Pathway Climate Change Scenarios / Gashaw Gismu Chakilu, Szegedi Sándor, Túri Zoltán
Dátum:	2020
ISSN:	2073-4441
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Water. - 12 : 11 (2020), p. 1-14. -
További szerzők:	Szegedi Sándor (1970-) (klimatológus) Túri Zoltán (1980-) (geográfus)
Pályázati támogatás:	EFOP-3.6.1-16-2016-00022 EFOP Stipendium Hungaricum Ösztöndíj Program Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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