Your search found 2 records
1 Betrie, G. D.; Mohamed, Yasir Abbas; van Griensven, A.; Popescu, I.; Mynett, A. 2009. Modeling of soil erosion and sediment transport in the Blue Nile Basin using the Open Model Interface approach. In Awulachew, Seleshi Bekele; Erkossa, Teklu; Smakhtin, Vladimir; Fernando, Ashra (Comps.). Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile. Intermediate Results Dissemination Workshop held at the International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia, 5-6 February 2009. Colombo, Sri Lanka: International Water Management Institute (IWMI). pp.132-140.
Erosion ; Highlands ; Sedimentary materials ; Simulation models ; River basin management ; Reservoirs / Ethiopia / Blue Nile River Basin / Roseires Reservoir / Sennar Reservoir
(Location: IWMI HQ Call no: IWMI 333.9162 G100 AWU Record No: H042513)
(0.41 MB)
Rapid land use change due to intensive agricultural practices in the Ethiopian Highlands, results in increasing rates of soil erosion. This manifested in significant impacts downstream by reducing the storage capacity of reservoirs (e.g., Roseires, Sennar), and high desilting costs of irrigation canals. Therefore, this paper aims to provide a better understanding of the process at basin scale. The Soil and Water Assessment Tool (SWAT) was used to model soil erosion in the upper catchments of the Blue Nile over the Ethiopian Plateau. The SWAT output forms the input sediment load for SOBEK, a river morphology model. The two models integrated using the principles of the Open Model Interface (OpenMI) at the Ethiopia-Sudan border. The Nash-Sutcliffe coefficient was found to be 0.72 and 0.66 for results of SWAT daily sediment calibration and validation, respectively. The SOBEK results also show a good fit of the simulated river flows at Roseires and Sennar reservoirs, both for calibration and validation. The results of the integrated modeling system showed 86 million tonnes/year of sediment load from the Upper Blue Nile, while SOBEK computes on average 19 Mm3/year of sediment deposition in the Roseires Reservoir. The spatial variability of soil erosion computed with SWAT showed more erosion over the northeastern part of the Upper Blue Nile, followed by the northern part. The overall exercise indicates that the integrated modeling is a promising approach to understand soil erosion, sediment transport, and sediment deposition in the Blue Nile Basin. This will improve the understanding of the upstream-downstream interdependencies, for better land and water management at basin scale.
2 Erkossa, Teklu; Menker, M.; Betrie, G. D.. 2011. Effects of bed width and planting date on water productivity of wheat grown on vertisols in the Ethiopian highlands. Irrigation and Drainage, 60(5):635-643. [doi: https://doi.org/10.1002/ird.608]
Water productivity ; Wheat ; Water requirements ; Vertisols ; Highlands / Ethiopia / Gimbichu District
(Location: IWMI HQ Call no: PER Record No: H043581)
(0.25 MB)
Waterlogging is a challenge to wheat (Triticum durum Desf.) productivity under the rainfed system on Vertisols in the Ethiopian Highlands. However, using suitable seedbed types and manipulating planting dates can minimize the effects. A four-year (2000–2003) field experiment was conducted to evaluate three seedbed types, broad bed and furrows (BBF) with early planting, the traditional ridge and furrows (RF) and its modified version (wide ridge and furrows (WRF)), both under early and late planting, in terms of water productivity of wheat. The FAOAquaCrop model was used to estimate crop water requirements. The result indicated that late planting on WRF or RF significantly ( p<0.05) increased grain yield and water productivity. Late planting on WRF (LWRF) increased rainfall water productivity by 66, 44 and 51%, respectively, as compared to BBF, earlyplanted WRF (EWRF) and late-planted RF (LRF). This was because of its increased effective area for crop growth over the RF and its relative suitability of planting time over the BBF. Therefore, late-planted WRF can be used for enhanced water productivity of wheat, while introducing fast-grow crops that are tolerant to waterlogging and growing early in the season may further enhance the land and water productivity in the area.
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