scholarly journals Water budget modelling of the Upper Blue Nile basin using the JGrass-NewAge model system and satellite data

2016 ◽  
Author(s):  
Wuletawu Abera ◽  
Giuseppe Formetta ◽  
Luca Brocca ◽  
Riccardo Rigon
Keyword(s):  
Water Budget ◽  
Nile Basin ◽  
Blue Nile ◽  
Budget Analysis ◽  
Blue Nile Basin ◽  
Basin Scale ◽  
And Storage ◽  
Daily Time ◽  
Upper Blue Nile Basin

Abstract. The Upper Blue Nile basin is one of the most data-scarce regions in the world, hence, the hydrological information required for informed decision making in water resources management is limited. The hydrological complexity of the basin, tied with the lack of hydrometerological data, means that most hydrological studies in the region are either restricted to small subbasins where there are relatively better hydrometeorological data available, or at the whole basin scale but at very coarse time scales and spatial resolutions. In this study, we develop a methodology that can improve the state-of-art by using the available, but sparse, hydrometerological data and satellite products. To this scope, we use the JGrass-NewAGE system to estimates the water budget components (Precipitation J, Evapotranspiration ET, discharge Q, and storage ds/dt). The satellite products SM2R-CCI is used for obtaining the rainfall inputs; SAF EUMETSAT for cloud cover fraction for proper net radiation estimation; GLEAM for comparison with estimated ET; and GRACE gravimetry data also for comparison of the total water storage amounts available. Results are obtained at daily time-steps for the period 1994–2009 (16 years), and they can be used as a reference for any water resource development activities in the region. The overall long term mean budget analysis shows that precipitation of the basin is 1360 ± 230 mm per year. Evaporation covers 56 % of the yearly budget, runoff is 33 %. Storage varies from minus 9.7 % to plus 6.9 % of the budget.

scholarly journals Modeling the water budget of the Upper Blue Nile basin using the JGrass-NewAge model system and satellite data

2017 ◽  
Vol 21 (6) ◽  
pp. 3145-3165 ◽  
Author(s):  
Wuletawu Abera ◽  
Giuseppe Formetta ◽  
Luca Brocca ◽  
Riccardo Rigon
Keyword(s):  
Water Resource ◽  
Water Budget ◽  
Water Resource Management ◽  
Hydrological Cycle ◽  
Nile Basin ◽  
Blue Nile ◽  
Budget Analysis ◽  
Blue Nile Basin ◽  
Basin Scale ◽  
Upper Blue Nile Basin

Abstract. The Upper Blue Nile basin is one of the most data-scarce regions in developing countries, and hence the hydrological information required for informed decision making in water resource management is limited. The hydrological complexity of the basin, tied with the lack of hydrometeorological data, means that most hydrological studies in the region are either restricted to small subbasins where there are relatively better hydrometeorological data available, or on the whole-basin scale but at very coarse timescales and spatial resolutions. In this study we develop a methodology that can improve the state of the art by using available, but sparse, hydrometeorological data and satellite products to obtain the estimates of all the components of the hydrological cycle (precipitation, evapotranspiration, discharge, and storage). To obtain the water-budget closure, we use the JGrass-NewAge system and various remote sensing products. The satellite product SM2R-CCI is used for obtaining the rainfall inputs, SAF EUMETSAT for cloud cover fraction for proper net radiation estimation, GLEAM for comparison with NewAge-estimated evapotranspiration, and GRACE gravimetry data for comparison of the total water storage amounts available in the whole basin. Results are obtained at daily time steps for the period 1994–2009 (16 years), and they can be used as a reference for any water resource development activities in the region. The overall water-budget analysis shows that precipitation of the basin is 1360 ± 230 mm per year. Evapotranspiration accounts for 56 % of the annual water budget, runoff is 33 %, storage varies from −10 to +17 % of the water budget.

scholarly journals Upper Blue Nile basin water budget from a multi-model perspective

2017 ◽  
Vol 555 ◽  
pp. 535-546 ◽  
Author(s):  
Hahn Chul Jung ◽  
Augusto Getirana ◽  
Frederick Policelli ◽  
Amy McNally ◽  
Kristi R. Arsenault ◽  
...  
Keyword(s):  
Water Budget ◽  
Nile Basin ◽  
Blue Nile ◽  
Blue Nile Basin ◽  
Basin Water ◽  
Upper Blue Nile Basin

scholarly journals Monitoring Residual Soil Moisture and Its Association to the Long-Term Variability of Rainfall over the Upper Blue Nile Basin in Ethiopia

2020 ◽  
Vol 12 (13) ◽  
pp. 2138
Author(s):  
Getachew Ayehu ◽  
Tsegaye Tadesse ◽  
Berhan Gessesse
Keyword(s):  
Soil Moisture ◽  
Rainfall Variability ◽  
Residual Soil ◽  
Nile Basin ◽  
Blue Nile ◽  
Monotonic Trend ◽  
Autumn Season ◽  
Blue Nile Basin ◽  
Upper Blue Nile Basin

Monitoring soil moisture and its association with rainfall variability is important to comprehend the hydrological processes and to set proper agricultural water use management to maximize crop growth and productivity. In this study, the European Space Agency’s Climate Change Initiative (ESA CCI) soil moisture product was applied to assess the dynamics of residual soil moisture in autumn (September to November) and its response to the long-term variability of rainfall in the Upper Blue Nile Basin (UBNB) of Ethiopia from 1992 to 2017. The basin was found to have autumn soil moisture (ASM) ranging from 0.09–0.38 m3/m3, with an average of 0.26 m3/m3. The ASM time series resulted in the coefficient of variation (CV) ranging from 2.8%–28% and classified as low-to-medium variability. In general, the monotonic trend analysis for ASM revealed that the UBNB had experienced a wetting trend for the past 26 years (1992–2017) at a rate of 0.00024 m3/m3 per year. A significant wetting trend ranging from 0.001 to 0.006 m3/m3 per year for the autumn season was found. This trend was mainly showed across the northwest region of the basin and covers about 18% of the total basin area. The spatial patterns and variability of rainfall and ASM were also found to be similar, which implies the strong relationship between rainfall and soil moisture in autumn. The spring and autumn season rainfall explained a considerable portion of ASM in the basin. The analyses also signified that the rainfall amount and distribution impacted by the topography and land cover classes of the basin showed a significant influence on the characteristics of the ASM. Further, the result verified that the behavior of ASM could be controlled by the loss of soil moisture through evapotranspiration and the gain from rainfall, although changes in rainfall were found to be the primary driver of ASM variability over the UBNB.

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