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If D is the depth of scour below original bed, then the width of launching apron is generally taken as:
- a)1.5 D
- b)2.5 D
- c)1.2 D
- d)2.0 D
Correct answer is option 'A'. Can you explain this answer?
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If D is the depth of scour below original bed, then the width of launc...
Heavy scour of the river bed at curved heads and shanks of guide banks can cause undermining of stone pitching thereby resulting in failure of guide banks. Such a failure can be prevented by providing launching apron beyond the toe of guide banks. The width of launching apron is generally taken as 1.5D.
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If D is the depth of scour below original bed, then the width of launc...
Introduction:
In civil engineering, scour refers to the erosion or removal of sediment from around structures, such as bridge piers or abutments, caused by the flow of water. To prevent scour, launching aprons are often used, which are wide concrete slabs constructed at the base of the structure. The width of the launching apron is an important design parameter and is generally determined based on the depth of scour below the original bed (D).
Explanation:
The width of the launching apron is generally taken as 1.5 times the depth of scour below the original bed (D). This means that the width of the launching apron is designed to be 1.5D.
Reasoning:
The reason for taking the width of the launching apron as 1.5D is to provide a sufficient buffer zone to prevent scour from reaching the structure. By having a wider launching apron, the flow of water is spread out over a larger area, reducing the velocity and erosive forces acting on the bed.
Benefits of a wider launching apron:
1. Increased stability: A wider launching apron provides greater stability to the structure. It distributes the flow of water over a larger area, reducing the likelihood of scour and erosion.
2. Reduced maintenance: By designing a wider launching apron, the need for frequent maintenance and repair due to scour can be minimized. This leads to cost savings and ensures the longevity of the structure.
3. Improved hydraulic performance: A wider launching apron can also improve the hydraulic performance of the structure. It can help regulate the flow of water, reducing turbulence and preventing the formation of eddies that can contribute to scour.
Conclusion:
In conclusion, the width of the launching apron is generally taken as 1.5 times the depth of scour below the original bed (D). This design parameter helps to provide a sufficient buffer zone to prevent scour and erosion, resulting in increased stability, reduced maintenance, and improved hydraulic performance of the structure.
In civil engineering, scour refers to the erosion or removal of sediment from around structures, such as bridge piers or abutments, caused by the flow of water. To prevent scour, launching aprons are often used, which are wide concrete slabs constructed at the base of the structure. The width of the launching apron is an important design parameter and is generally determined based on the depth of scour below the original bed (D).
Explanation:
The width of the launching apron is generally taken as 1.5 times the depth of scour below the original bed (D). This means that the width of the launching apron is designed to be 1.5D.
Reasoning:
The reason for taking the width of the launching apron as 1.5D is to provide a sufficient buffer zone to prevent scour from reaching the structure. By having a wider launching apron, the flow of water is spread out over a larger area, reducing the velocity and erosive forces acting on the bed.
Benefits of a wider launching apron:
1. Increased stability: A wider launching apron provides greater stability to the structure. It distributes the flow of water over a larger area, reducing the likelihood of scour and erosion.
2. Reduced maintenance: By designing a wider launching apron, the need for frequent maintenance and repair due to scour can be minimized. This leads to cost savings and ensures the longevity of the structure.
3. Improved hydraulic performance: A wider launching apron can also improve the hydraulic performance of the structure. It can help regulate the flow of water, reducing turbulence and preventing the formation of eddies that can contribute to scour.
Conclusion:
In conclusion, the width of the launching apron is generally taken as 1.5 times the depth of scour below the original bed (D). This design parameter helps to provide a sufficient buffer zone to prevent scour and erosion, resulting in increased stability, reduced maintenance, and improved hydraulic performance of the structure.
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If D is the depth of scour below original bed, then the width of launching apron is generally taken as:a)1.5 Db)2.5 Dc)1.2 Dd)2.0 DCorrect answer is option 'A'. Can you explain this answer?
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