On the Performance and Limitations of Modeling Downstream Impacts of Nile Hydropower Dams
(2024) AGU24 — Location: USA (9.December.2024)
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- Abstract
- The highly populous Eastern Nile Basin countries face a growing challenge in balancing the water-energy nexus due to competing interests and pressing development needs. More than a decade of negotiations have centered around constructing and operating upstream hydropower dams, such as the Grand Ethiopian Renaissance Dam (GERD), which will double the electricity, bringing long-awaited and needed power for the regional development of East Africa. However, GERD and future hydropower dams will inevitably alter the Nile River's flow, which would have consequences on the downstream nations’ water and energy budgets to the extent that is subject to debate. Several modeling efforts called for a comprehensive agreement that addresses the interests of all three riparian states. The above has not yet been achieved despite this call being repeated in high-profile publications over the past years. We present herein a reproduction of these hydraulic simulations and highlight the limitations and performance of the different methods used. In particular, we show how sampling the river flow periods and the considered assumptions can lead to erroneous and inconclusive results. We showcase the reproduction of recent modeling efforts and the divergence in results when assessing the downstream impacts. We identify the root cause of these numerical discrepancies and call for the need for transparent data sharing in modeling efforts for these efforts to be convincing for both the downstream and upstream water and hydropower research communities. Our hydraulic reproduction for the water-energy trade-off studies calls for more transparency in sharing the data and entries of these modeling efforts in order for them to play an efficient role in curbing the dispute between the river basin riparian.
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Heggy, E., Ramah, M., Hanert, E., & et al. (2024). On the Performance and Limitations of Modeling Downstream Impacts of Nile Hydropower Dams. AGU24, USA. https://hdl.handle.net/2078.5/240482