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Streamflow variability and its linkage to ENSO events in the Ethiopian Rift Valley Lakes Basin

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Title Streamflow variability and its linkage to ENSO events in the Ethiopian Rift Valley Lakes Basin
 
Creator Worako, A. W.
Haile, Alemseged Tamiru
Taye, Meron Teferi
 
Subject stream flow
river basins
el nino-southern oscillation
hydrology
indicators
trends
catchment areas
watersheds
climate change
 
Description Study Region: The Ethiopian Rift Valley Lakes basin is found in the main Ethiopian Rift Valley system.
Study Focus: Understanding the hydrological impact of El Niño-Southern Oscillation (ENSO) is of a paramount importance for society since it substantially affects the environmental and socio-economic conditions. The relation between ENSO indicators (SOI, MEI and Niño3.4) and streamflow magnitude was statistically evaluated with partial correlation, cross correlation, extreme streamflow indices and streamflow deficits to provide empirical evidence on how ENSO phases (La Niña and El Niño) affect streamflow variability. Trends of streamflow and ENSO indicators were tested using the non-parametric Mann-Kendall test.
New Hydrological Insights for the Region: Our findings indicate that the partial correlation between the catchment area and ENSO effect on streamflow were not statistically significant at p < 0.05 after removing the south-north gradient. The direction of the ENSO effect is spatially inconsistent since El Niño (La Niña) causes positive deviation in some catchments and negative deviation for other catchments. Though statistically insignificant, reduced flow is detected for many catchments during El Niño years. For most catchment, the extreme high flow has a larger magnitude during La Niña than El Niño whereas the extreme low flow has a larger magnitude during El Niño than La Niña years. Overall, the relationship between ENSO and streamflow of the study area is found spatially inconsistent and statistically insignificant for most catchments.
 
Date 2021-06
2021-10-31T16:50:20Z
2021-10-31T16:50:20Z
 
Type Journal Article
 
Identifier Worako, A. W.; Haile, Alemseged Tamiru; Taye, Meron Teferi. 2021. Streamflow variability and its linkage to ENSO events in the Ethiopian Rift Valley Lakes Basin. Journal of Hydrology: Regional Studies, 35:100817. [doi: https://doi.org/10.1016/j.ejrh.2021.100817]
2214-5818
https://hdl.handle.net/10568/115753
https://www.sciencedirect.com/science/article/pii/S221458182100046X/pdfft?md5=86a8808571a62fee3a94a2ad0492e4ca&pid=1-s2.0-S221458182100046X-main.pdf
https://doi.org/10.1016/j.ejrh.2021.100817
H050726
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 35:100817
 
Publisher Elsevier BV
 
Source Journal of Hydrology: Regional Studies