Papers by Mohamed K H A I R Y Ali
Limnological Review, Jun 28, 2024
The design of water structures is crucial for efficient hydraulic performance. Open irrigation
c... more The design of water structures is crucial for efficient hydraulic performance. Open irrigation
canals are designed with specific inside slopes to ensure maximum stability, while the wing walls
of water structures constructed across the canal are designed to maximize hydraulic performance.
Therefore, ensuring compatibility between the canal inside slopes and the wing wall types used on
both the upstream and downstream sides is of great importance for achieving optimum hydraulic
performance. However, our literature review indicates that this necessary compatibility between
the canal inside slope and the wing wall type has not been adequately researched and studied.
This present study aims to numerically investigate the relationship between open canals inside
slopes and wing wall types, as well as examine the impact of using different wing wall types with
varying canals inside slopes on hydraulic performance efficiency. Four canal inside slope ratios (Z)
(H: V = 2:1, 1.5:1, 1:1, and 0.75:1) are simulated using the HEC-RAS program, along with two types
of water structure wing walls (box and broken). The HEC-RAS numerical model provides accurate
and reliable estimations of the hydraulic characteristics of flowing water through the structure, and
the results are verified using previous experimental measurements available in the literature. The
variation (ε%) between the measured and computed results is consistent for estimating specific energy,
velocity, heading (afflux), and water depths. The simulation results demonstrate that changing the
canal inside slope (Z) from 0.75:1 to 2:1 results in a relative increase of approximately 27.84% in
heading up and 15.06% in velocity. Additionally, the broken wing wall proves to be more effective than
the box type. The study confirms that the optimal configuration for the most efficient performance
of water structures involves utilizing broken-type wing walls on the upstream side, along with a
1H:1V canal inside slope. This configuration reduces the relative velocity and relative heading by
approximately 12% and 20%, respectively, which is considered highly favorable.
Limnological Review, Dec 12, 2024
As spillways are hydraulic structures constructed for the safe release of floodwater from the ups... more As spillways are hydraulic structures constructed for the safe release of floodwater from the upstream (US) side of a dam to the downstream side, or from the end of canals and drains to a lower stream, the upstream water flow of such structures gains significant amounts of potential energy. As this water flows over a spillway or escapes, the gained potential energy is converted into kinetic energy, resulting in the water gaining an increasing velocity, thereby enhancing the flow’s destructive potential. This can have a harmful impact on the hydraulic performance and the structural stability of the spillway itself. To avoid such harmful effects, engineers and designers of such structures usually provide the spillways and water escapes with some tools for dissipating that kinetic energy and decreasing the flowing water’s velocity. The present study aims to enhance the performance efficiency of such dissipating tools, as well as to improve the quality of the flowing water by leveraging the significant turbulence generated by the existing energy dissipators on the back of the spillway body. The aeration process enabled by this turbulence increases the dissolved oxygen contents, thereby enhancing the water quality, which is one of the main objectives of this work. On the back surface of the spillway, various dissipater shapes with different geometrical configurations, dimensions, and combinations were tested, in order to determine the most suitable engineering treatments for maximizing the dissolved oxygen content and improving the water quality for various uses, as the study’s main goal. By testing 21 different model configurations with the available laboratory discharges, the study successfully identified the most effective shape and properties of the desired dissipator, which increased the dissolved oxygen content by an average of 21.70% and dissipated water energy by about 69%.
Twenty-Second International Water Technology Conference, IWTC22 , 2019
Spillways usually used for escaping water from the U.S. having a high-water level, to D.S. having... more Spillways usually used for escaping water from the U.S. having a high-water level, to D.S. having a low water level in most of the diversion head structures through water streams. The D.S. of such spillways usually suffers from the destructive impacts of the generated kinetic energy of the flowing water, having a very high speed, which may cause cavitation in such spillways body. In the present work, we are introducing some geometrical treatments on the back of the spillway body, for increasing its efficiency in dissipating the kinetic energy of the flowing water, having great potential energy, and improving the flowing water quality by increasing its dissolved oxygen content, through generating huge aeration at the flow in the back, in addition to prevent cavitation may occur, and generated on the back of the spillway body, and protecting its safety. Literature proved that the stepped back of the spillway body is one of the most practicable trails done for achieving the above-mentioned goals. In this paper, we present a review of previous authors' technical methods to obtain the best design of the spillway geometric that dissipating high values of the kinetic energy and improving the flow aeration.
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Papers by Mohamed K H A I R Y Ali
canals are designed with specific inside slopes to ensure maximum stability, while the wing walls
of water structures constructed across the canal are designed to maximize hydraulic performance.
Therefore, ensuring compatibility between the canal inside slopes and the wing wall types used on
both the upstream and downstream sides is of great importance for achieving optimum hydraulic
performance. However, our literature review indicates that this necessary compatibility between
the canal inside slope and the wing wall type has not been adequately researched and studied.
This present study aims to numerically investigate the relationship between open canals inside
slopes and wing wall types, as well as examine the impact of using different wing wall types with
varying canals inside slopes on hydraulic performance efficiency. Four canal inside slope ratios (Z)
(H: V = 2:1, 1.5:1, 1:1, and 0.75:1) are simulated using the HEC-RAS program, along with two types
of water structure wing walls (box and broken). The HEC-RAS numerical model provides accurate
and reliable estimations of the hydraulic characteristics of flowing water through the structure, and
the results are verified using previous experimental measurements available in the literature. The
variation (ε%) between the measured and computed results is consistent for estimating specific energy,
velocity, heading (afflux), and water depths. The simulation results demonstrate that changing the
canal inside slope (Z) from 0.75:1 to 2:1 results in a relative increase of approximately 27.84% in
heading up and 15.06% in velocity. Additionally, the broken wing wall proves to be more effective than
the box type. The study confirms that the optimal configuration for the most efficient performance
of water structures involves utilizing broken-type wing walls on the upstream side, along with a
1H:1V canal inside slope. This configuration reduces the relative velocity and relative heading by
approximately 12% and 20%, respectively, which is considered highly favorable.
canals are designed with specific inside slopes to ensure maximum stability, while the wing walls
of water structures constructed across the canal are designed to maximize hydraulic performance.
Therefore, ensuring compatibility between the canal inside slopes and the wing wall types used on
both the upstream and downstream sides is of great importance for achieving optimum hydraulic
performance. However, our literature review indicates that this necessary compatibility between
the canal inside slope and the wing wall type has not been adequately researched and studied.
This present study aims to numerically investigate the relationship between open canals inside
slopes and wing wall types, as well as examine the impact of using different wing wall types with
varying canals inside slopes on hydraulic performance efficiency. Four canal inside slope ratios (Z)
(H: V = 2:1, 1.5:1, 1:1, and 0.75:1) are simulated using the HEC-RAS program, along with two types
of water structure wing walls (box and broken). The HEC-RAS numerical model provides accurate
and reliable estimations of the hydraulic characteristics of flowing water through the structure, and
the results are verified using previous experimental measurements available in the literature. The
variation (ε%) between the measured and computed results is consistent for estimating specific energy,
velocity, heading (afflux), and water depths. The simulation results demonstrate that changing the
canal inside slope (Z) from 0.75:1 to 2:1 results in a relative increase of approximately 27.84% in
heading up and 15.06% in velocity. Additionally, the broken wing wall proves to be more effective than
the box type. The study confirms that the optimal configuration for the most efficient performance
of water structures involves utilizing broken-type wing walls on the upstream side, along with a
1H:1V canal inside slope. This configuration reduces the relative velocity and relative heading by
approximately 12% and 20%, respectively, which is considered highly favorable.