Optimizing Trapezoidal Labyrinth Weir Design for Enhanced Scour Mitigation in Straight Channels
Abstract
:1. Introduction
2. Materials and Methods
2.1. Model Setup
2.2. Justification of Experimental Parameters and Assumptions
- The weirs were constructed from 5 mm thick metal sheets. This thickness was chosen as an optimal balance between structural integrity and practicality. Thinner sheets (<5 mm) led to deformations, particularly for taller weirs (40 cm) under high discharge. On the other hand, thicker sheets increased costs and posed handling difficulties during installation.
- The weir heights were selected between 30 and 40 cm. This range was determined after observing that taller weirs caused complete bed material removal under high discharge, while shorter weirs failed to produce noticeable bed configurations under low discharge.
- The weir apex angles ranged between 20° and 80°. The angles below 20° showed poor energy dissipation performance, while angles exceeding 80° caused the trapezoidal labyrinth weir to behave similarly to a classical sharp-crested weir, negating the benefits of the labyrinth design.
- Discharges between 50 and 200 L/s were tested. The flows below 50 L/s did not produce significant bed material development for shorter weirs, while discharges exceeding 200 L/s resulted in complete bed material movement, limiting the ability to study the scour patterns.
- The run time duration was set to 4 h, during which the quasi-equilibrium state was reached, and no further appreciable bed movement was recorded. Consequently, extending the run time duration beyond this period was useless with respect to bed configurations.
2.3. Dimensional Analysis
3. Results and Discussion
3.1. Effect of Labyrinth Weir Apex Angle on Scour and Deposition Parameters
3.2. Effect of Labyrinth Weir Height on Scour and Deposition Parameters
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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P | weir height | g | the gravity acceleration |
Ds | maximum scour depth | water density | |
Ls | soil particle density | ||
Dd | maximum deposition depth | So | is the flume bed slope |
Ld | maximum deposition length | d50 | median grain size |
Q | passing discharge (L/s) | V | the mean flow velocity |
W | width of the channel | μ | dynamic water viscosity |
Lb | length of the concrete apron | σ | the surface tension |
yt | tailwater depth | N | total number of weir cycles |
α | the labyrinth weir apex angle |
P = 40 cm | P = 35 cm | P = 30 cm | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
α = 80° | α = 45° | α = 20° | Linear | α = 80° | α = 45° | α = 20° | Linear | α = 80° | α = 45° | α = 20° | Linear | |
Scour depth (Ds/yt) | 33 | 10 | 23 | 41 | 33 | 10 | 23 | 35 | 46 | 18 | 35 | 29 |
Scour length (Ls/yt) | 36 | 15 | 27 | 50 | 38 | 14 | 26 | 40 | 39 | 16 | 33 | 25 |
Deposition depth (Dd/yt) | 39 | 14 | 30 | 40 | 42 | 14 | 30 | 40 | 50 | 25 | 35 | 29 |
Deposition length (Ld/yt) | 35 | 17 | 28 | 50 | 37 | 16 | 29 | 40 | 40 | 17 | 31 | 25 |
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Shehata, A.H.; Youssef, T.F.; Hamada, H.A.; M., I.M.; Samy, A. Optimizing Trapezoidal Labyrinth Weir Design for Enhanced Scour Mitigation in Straight Channels. Water 2024, 16, 2443. https://doi.org/10.3390/w16172443
Shehata AH, Youssef TF, Hamada HA, M. IM, Samy A. Optimizing Trapezoidal Labyrinth Weir Design for Enhanced Scour Mitigation in Straight Channels. Water. 2024; 16(17):2443. https://doi.org/10.3390/w16172443
Chicago/Turabian StyleShehata, Ahmed H., Tahani F. Youssef, Hamada A. Hamada, Ibrahim M. M., and Abeer Samy. 2024. "Optimizing Trapezoidal Labyrinth Weir Design for Enhanced Scour Mitigation in Straight Channels" Water 16, no. 17: 2443. https://doi.org/10.3390/w16172443