Hydraulic Jump Investigation in Compound Channel with Irregular Roughness Arrangement Under Various Geometric and Hydraulic Conditions | ||
| Journal of Hydraulic and Water Engineering | ||
| دوره 2، شماره 1، مهر 2024، صفحه 43-57 اصل مقاله (458.82 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22044/jhwe.2024.14358.1037 | ||
| نویسندگان | ||
| Pardis Zeydvand1؛ Mehdi Behdarvandi Askar* 2 | ||
| 1Graduated of Hydraulic Structures, Department of Offshore Structures, Faculty of Marine Engineering, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran. | ||
| 2Associate Professor, Department of Offshore Structures, Faculty of Marine Engineering, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran. | ||
| چکیده | ||
| Hydraulic jump, a rapidly changing flow phenomenon, has been encountered in many practical applications and refers to the transition of flow from supercritical to subcritical state. When water reaches a section of the channel with a supercritical flow regime and needs to undergo a change in state due to specific channel characteristics and position, the depth of flow increases significantly over a relatively short distance, resulting in a noticeable energy dissipation and a considerable reduction in velocity. On the other hand, composite channels, due to their different hydraulic and geometric conditions in the main channel and floodplain sections, bear closer resemblance to natural channels. This research focuses on investigating hydraulic jumps in compound channel with irregular roughness arrangements under various geometric and hydraulic conditions using Flow-3D. The width and depth of the main channel are kept constant, while the width of the floodplains varies in three values: 18 cm, 22.5 cm, and 45 cm. Simulations are conducted for three depth ratios, three roughness height ratios, and three different velocities. The irregular roughness elements in the form of small cubes are embedded in the channel bed in a zigzag pattern. According to the simulation results, the presence of roughness elements leads to a reduction in the secondary jump depth compared to the smooth case. For instance, with a floodplain width of 18 cm, a depth ratio of 3.0, a roughness height ratio of 2, and a velocity of 5.3 m/s, the average secondary depth decreases by approximately 64.5% compared to the smooth channel. However, with an increase in the floodplain width to 45 cm, the reduction in the secondary jump depth is about 59.12%. The minimum value of the secondary-to-initial jump depth ratio is observed at a relative depth of 6.0 and a roughness height ratio of 2. Furthermore, it is observed that the jump length significantly decreases with an increase in the roughness height ratios for smaller depth ratios. The jump length decreases by approximately 22.5% at the minimum value of the roughness height ratio, with a floodplain width of 18 cm, a velo | ||
| کلیدواژهها | ||
| Hydraulic jump؛ irregular roughness؛ composite section؛ jump length؛ relative depth | ||
| مراجع | ||
|
Badiee Zadegan, R., Sanei, M., & Esmaeili, K. (2014). Comparison of hydraulic jump characteristics on different rough bed types (Vol. 8).
Bajestan, M., & Neisi, K. (2009). A New Roughened Bed Hydraulic Jump Stilling Basin. Asian Journal of Applied Sciences, 2, 436-445. https://doi.org/10.3923/ajaps.2009.436.445
Bazaz, M., Ghorbani, B., & Eskini, M. (2012). Investigating hydraulic jump variations on rough beds compared to changes in wave roughness lengths (Vol. 7).
Ghazali, M. (2010). Investigating the effect of toothed bed on hydraulic jump characteristics.
Hasanzadeh Vayghan, V., Mohammadi, M., & Ranjbar, A. (2019). Experimental Study of the Rooster Tail Jump and End Sill in Horseshoe Spillways (Vol. 5).
Javadi, A., & Asadi, E. (2021). Experimental study on the effects of rectangular zigzag blocks geometry on hydraulic jump characteristics in trapezoidal channel (Vol. 16).
Mohammad Ali, H. S. (1991). Effect of roughened-bed stilling basin on length of rectangular hydraulic jumps (Vol. 117).
Najandali, A., Esmaeili, K., Farhoudi, J., & Ravar, Z. (2011). Effect of triangular blocks on the characteristics of hydraulic jump (Vol. 2.5).
Novaes, C., & Marques, R. C. (2024). Policy, institutions and regulation in stormwater management: A hybrid literature review. Water, 16(1), 186.
Parsamehr, P., Hosseinzadeh, A., Farsadizadeh, D., Abaspour, A., & Nasresfahani, M. (2016). Investigation of hydraulic jump characteristics on rough bed with different density and roughness arrangements (Vol. 26).
Parsamehr, P., Hosseinzadeh Delir, A., Farsadizadeh, D., & Abbaspour, A. (2012). Hydraulic jump on a bed with semi-cylindrical roughness (Vol. 26).
Rajaratnam, N. (1966). The hydraulic jump in sloping channels (Vol. 32).
Rajaratnam, N. (1968). Hydraulic jump on rough bed (Vol. 11).
Rajaratnam, N., & Beltaos, S. (1977). Erosion by impinging circular turbulent jets. Journal of the Hydraulics Division, 103(10), 1191-1205.
Talebi, Z., Hosseini, S. H., Azhdary, K., & Emamgholizadeh, S. (2025). New Findings of Flow Velocity and bed Shear Stress at an Open Channel Junction. Iranian Journal of Science and Technology, Transactions of Civil Engineering, 49(1), 799-818.
Vischer, D., Hager, W. H., & Cischer, D. (1998). Dam hydraulics. Wiley. | ||
|
آمار تعداد مشاهده مقاله: 106 تعداد دریافت فایل اصل مقاله: 31 |
||