Deterioration of streamflow monitoring in Omo-Gibe basin in Ethiopia

Haile, Alemseged Tamiru; Asfaw, Wegayehu; Rientjes, T.H.M.; Worako, Adimasu Woldesenbet

doi:10.1080/02626667.2022.2060110

Cited by 12 publications

(9 citation statements)

References 44 publications

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“…As an example, they report that the number of hydrological gauges in the Congo collapsed, from 400 operational stations by the end of 1960s, to 15 gauges considered as operational currently. Most African rivers suffer from a deficit of real-time in situ monitoring (Haile et al 2022;Tramblay et al 2021), worsen by data sharing issues for transboundary basins.…”

Section: Limitations Of the Hydrometeorological Observation Network I...mentioning

confidence: 99%

“…There is therefore a pressing need for an improved understanding and evaluation of flood hazard at global scale (UNISDR 2015). Data on river flow and estimates of flood hazard are still of insufficient quality in many regions of the world (Wright 2015;Haile et al 2022), hampering the implementation of appropriate mitigation measures. The situation could be improved by means of satellite information.…”

Section: Introductionmentioning

confidence: 99%

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Hydrometeorological Extreme Events in Africa: The Role of Satellite Observations for Monitoring Pluvial and Fluvial Flood Risk

et al. 2023

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This article reviews the state of the art in the use of space-borne observations for analyzing extreme rainfall and flood events in Africa. Floods occur across many space and timescales, from very localized flash flood events to slow propagation of discharge peaks in large rivers. We discuss here how satellite data can help us understand the genesis and impacts of these flood events, monitor their evolution, and better constrain prediction models, thereby improving early warning and population protection. To illustrate these topics, we reanalyze major flood events that occurred in Niger, Mozambique, Central African Republic and Ivory Coast, using satellite information.

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Section: Limitations Of the Hydrometeorological Observation Network I...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrometeorological Extreme Events in Africa: The Role of Satellite Observations for Monitoring Pluvial and Fluvial Flood Risk

et al. 2023

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“…The rating curves can have large temporal errors if the gauging station is installed on a site affected by erosion and sedimentation. In the Omo-Gibe basin in Ethiopia, most stations were installed on an unstable channel bed that can cause large temporal errors on their rating curves due to changes in channel morphology (Haile et al 2022). For the North River Basin in China, Qiu et al (2021) obtained that the cross-section of the gauging station below the 5 m water level mark (on the staff gauge) increased from 565 to 1,678 m 2 over a 4-year observation period.…”

Section: Introductionmentioning

confidence: 99%

Filling streamflow data gaps through the construction of rating curves in the Lake Tana sub-basin, Nile basin

Haile

Geremew²,

Wassie³

et al. 2023

Journal of Water and Climate Change

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In recent decades, streamflow data remain inaccessible for most river gauges in Ethiopia due to a lack of updated stage–discharge relationships, also called rating curves. In this study, researchers and hydrologic technicians collaborated to fill the recent streamflow data gaps at three gauging stations in the Lake Tana sub-basin of the Nile River. We conducted extensive field campaigns to improve the coverage of stage–discharge measurements for rating curve development. We evaluated the rating curve uncertainty during the time of its establishment and the sensitivity of the rating curves to sample size. The stage–discharge measurements conducted by the hydrological agency during the period 2016–2020 were found inadequate in number and coverage to establish reliable rating curves. Hence, converting recent water level measurements to discharge data was made possible using the rating curves developed in this study. The converted discharge data will be accessible to researchers to investigate the sub-basin's hydrology. Our study emphasizes the need to improve the stage–discharge measurement frequency to keep up with the frequent change in the morphology of the rivers' channels. The study demonstrated that collaboration between the data provider and data users can improve streamflow data availability and accessibility, which has become an increasing global challenge.

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“…Rivers play a vital role in sustaining marine organisms and human populations that directly and indirectly depend on it [ 1 ]. However, the progressive deterioration of rivers has resulted from a regional and global crisis, accentuated by increased climate change [ 2 , 3 ]. The United Nations (UN) World Water Department Report projects that the strain on rivers will have grown by 22 to 34% by 2050 [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Anthropogenic Land Use and Land Cover Change as Potential Drivers of Sediment Sources in the Upper Crocodile River, North West Province, South Africa

Nde

Bett

Mathuthu

et al. 2022

IJERPH

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In this study, we investigated the accelerating pace of anthropogenic land use and land cover change (LULCC) disturbance, which has generated enormous impacts on the Crocodile River. Spot images from 1996, 2009 and 2022 were used to generate the land use maps and quantify the changes. A supervised classification with the maximum likelihood classifier was used to classify the images. Sediment sources were classified into two sources, revealed by erosional characteristics in the catchment. A gamma spectrometry detector, high-purity germanium (HPGe) “Well” detector by Canberra and inductively coupled plasma mass spectrometry (ICP–MS) were used for the analysis of the samples. The results revealed that from 1996–2022, built-up areas, bare land and water bodies increased by 3.48%, 2.47% and 1.90%, respectively. All the LULCC classes increased annually from 1996–2022, except for grassland, which shrunk. The results of the radionuclides analysis showed that 210Pbex was found to be a more effective tracer than 137Cs. The mass balance model revealed that subsurface sources contributed 60%, while surface sources contributed 40%, of the sediment load in the river. This research provides valuable information necessary for integrated catchment management policies for future LULCC and soil erosion to be adopted.

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Deterioration of streamflow monitoring in Omo-Gibe basin in Ethiopia

Cited by 12 publications

References 44 publications

Hydrometeorological Extreme Events in Africa: The Role of Satellite Observations for Monitoring Pluvial and Fluvial Flood Risk

Hydrometeorological Extreme Events in Africa: The Role of Satellite Observations for Monitoring Pluvial and Fluvial Flood Risk

Filling streamflow data gaps through the construction of rating curves in the Lake Tana sub-basin, Nile basin

Anthropogenic Land Use and Land Cover Change as Potential Drivers of Sediment Sources in the Upper Crocodile River, North West Province, South Africa

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