The spacing between adjacent spurs in river training work is generally kept between ______ times the spur length.
2 to 2.5
River training involves various engineering measures to stabilize a river channel, prevent bank erosion, control floods, improve navigation, and guide the flow. One common structure used in river training is a spur, also known as a groyne. Spurs are short, permeable or impermeable structures built outward from the river bank into the river flow.
The primary purpose of spurs in river training is to deflect the current away from the bank, promote sediment deposition in desired areas, and protect the bank from erosive forces. When multiple spurs are used along a stretch of the river, their effective functioning depends significantly on the spacing between adjacent spurs.
Spur Spacing in River Training Works
The spacing between adjacent spurs is a critical design parameter that influences their effectiveness and the overall stability of the river training work. If the spurs are spaced too far apart, the bank between them might still be susceptible to erosion. If they are too close, it can lead to inefficient use of resources and potential navigational issues or excessive sedimentation in undesired locations.
Based on common hydraulic engineering practices and observations, the optimal spacing between adjacent spurs in river training work is generally kept as a multiple of the spur length. This ensures that the protective influence of one spur extends adequately to cover the area before the next spur begins, creating a continuous protective zone along the bank.
Typically, the spacing \(\left(S\right)\) between two adjacent spurs is related to the length \(\left(L\right)\) of the spur. This ratio is often determined empirically and through hydraulic model studies to achieve the desired flow patterns and sediment management.
For effective river training, the general guideline for spacing between adjacent spurs is maintained between 2 to 2.5 times the spur length. This range is considered optimal for most river conditions to ensure comprehensive bank protection and effective flow guidance without creating undesirable side effects.
| Parameter | Description | Typical Value/Range |
|---|---|---|
| Spur Length \(\left(L\right)\) | The length of the spur projecting into the river. | Varies based on river width, flow, and purpose |
| Spacing between Adjacent Spurs \(\left(S\right)\) | The distance along the bank between the centers of two consecutive spurs. | 2 to 2.5 times the spur length \(\left(S = 2L \text{ to } 2.5L\right)\) |
Therefore, the common engineering practice suggests that the spacing between adjacent spurs in river training work is typically kept between 2 to 2.5 times the spur length.
Important Questions from Floods and River Training
The rise in the maximum flood level upstream of the weir caused due to the construction of the weir across the river is called:
- Dickens formula is an empical formula used for the estimation of the peak rate of runoff Q p during flood from a catchment , and is related to the parameter :
Which category of river training work deals with flood control?
Which one of the following effects produced by a cut off in an alluvial river is not an advantage to navigation?
________ are sometimes used in river training work to close a particular flow, so that river flow may be directed in some other desired direction.
