Lake Nasser reservoir sedimentation estimates for various water resources planning
Lake Nasser reservoir sedimentation estimates for various water resources planning
Due to the variety of problems encountered in storage-yield analyses for large reservoirs, no real attempt has been made to systemize a selected single approach for general use. In the present work, a comprehensive survey of several current methods was made in sufficient detail to orient the scope of this research towards the most appropriate technique for simulating the High Aswan Dam reservoir (Lake Nasser) hydraulic and sediment behaviour. The well known HEC-6 program was used to build a mathematical model for Lake Nasser. Theoretical analysis was performed to define the main parameters controlling the reservoir sedimentation.
Volume of sediment accumulated was predicted with an error range of 0.23% to 6.67% of the deposited volumes during the simulation periods. Cross-sectional area of sediment deposition had an average error ranging between 1.16% and 12.2% of the sedimentation areas. Thalweg elevation average error had a range of -0.99 m to 0.41 m, representing -1.96% and 0.69% of the average local water depth, and -4.53% and 1.46% of the average sedimentation depth during the simulation interval. The error in water levels computation was essentially low. Average water surface elevation calculation errors ranged from -0.10 m to 0.03 m. This represents -0.20% and 0.05% of the average storage depth, and 0.11% and 0.38% of the reservoir water surface fluctuation within the study time. Sediment trap efficiency was predicted with an accuracy as high as 99% throughout the 31 years simulation period, 1964 through 1995.
Future predictions indicated that the current deposition trend will continue until year 2000, the upper third of the reservoir (between km 502 and km 350) will experience an additional average bed level rise of 1.6 m to reach 160 m. An overall erosion phase will follow until year 2030, bringing the average bed elevation to 150 m in these reaches. The eroded sediment will move to the next downstream 50 km. The useful life of Lake Nasser was estimated as 2277 years, 416 for the dead storage zone and 1861 for the live storage zone. The slope of the delta deposition will reach the High Aswan Dam by 2065. The delta forest will reach the Tushka canal intake in 2000 with a 8.24 m thickness in 2002. The delta elevation at the South Valley Canal intake location will be well below the pumping suction level until year 2500.
University of Southampton
El-Arabawy, Mohsen Mohamed Mohamed
82d91abc-20ad-4fb7-9d32-703403ee10ae
2000
El-Arabawy, Mohsen Mohamed Mohamed
82d91abc-20ad-4fb7-9d32-703403ee10ae
El-Arabawy, Mohsen Mohamed Mohamed
(2000)
Lake Nasser reservoir sedimentation estimates for various water resources planning.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Due to the variety of problems encountered in storage-yield analyses for large reservoirs, no real attempt has been made to systemize a selected single approach for general use. In the present work, a comprehensive survey of several current methods was made in sufficient detail to orient the scope of this research towards the most appropriate technique for simulating the High Aswan Dam reservoir (Lake Nasser) hydraulic and sediment behaviour. The well known HEC-6 program was used to build a mathematical model for Lake Nasser. Theoretical analysis was performed to define the main parameters controlling the reservoir sedimentation.
Volume of sediment accumulated was predicted with an error range of 0.23% to 6.67% of the deposited volumes during the simulation periods. Cross-sectional area of sediment deposition had an average error ranging between 1.16% and 12.2% of the sedimentation areas. Thalweg elevation average error had a range of -0.99 m to 0.41 m, representing -1.96% and 0.69% of the average local water depth, and -4.53% and 1.46% of the average sedimentation depth during the simulation interval. The error in water levels computation was essentially low. Average water surface elevation calculation errors ranged from -0.10 m to 0.03 m. This represents -0.20% and 0.05% of the average storage depth, and 0.11% and 0.38% of the reservoir water surface fluctuation within the study time. Sediment trap efficiency was predicted with an accuracy as high as 99% throughout the 31 years simulation period, 1964 through 1995.
Future predictions indicated that the current deposition trend will continue until year 2000, the upper third of the reservoir (between km 502 and km 350) will experience an additional average bed level rise of 1.6 m to reach 160 m. An overall erosion phase will follow until year 2030, bringing the average bed elevation to 150 m in these reaches. The eroded sediment will move to the next downstream 50 km. The useful life of Lake Nasser was estimated as 2277 years, 416 for the dead storage zone and 1861 for the live storage zone. The slope of the delta deposition will reach the High Aswan Dam by 2065. The delta forest will reach the Tushka canal intake in 2000 with a 8.24 m thickness in 2002. The delta elevation at the South Valley Canal intake location will be well below the pumping suction level until year 2500.
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Published date: 2000
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Local EPrints ID: 464352
URI: http://eprints.soton.ac.uk/id/eprint/464352
PURE UUID: 299ee35a-afbe-4b2a-84ef-acc35ed6ef6b
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Date deposited: 04 Jul 2022 22:19
Last modified: 16 Mar 2024 19:26
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Author:
Mohsen Mohamed Mohamed El-Arabawy
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