Labirent Yan Savak Akımı için Taban Malzemesi Boyutlarının Oyulmaya Etkisi

Abstract

Alüvyal tabanlı bir akarsuda akıma bağlı olarak sürekli sediment hareketi söz konusudur. Bir akarsuya inşa edilen yeni bir yan savak tipi olan labirent yan savak ile klasik savağa göre çok daha fazla deşarj yapılabilmektedir. Bu durum taşkın kontrolü için labirent savağın önemini arttırmaktadır. Savak tipinin denge oyulma derinliği üzerine etkisinin büyük olmasıyla birlikte, taban malzemesi medyan dane çapının oyulmaya ve taban şekline etkisi büyüktür. Bu çalışmada, taban malzemesi medyan dane çapının denge oyulma derinliğini nasıl etkilediğinin araştırılması amaçlanmıştır. Bu amaçla, farklı medyan dane çapına sahip taban malzemeleri kullanılarak akım hızı değişimiyle birlikte labirent yan savak etrafındaki denge oyulma derinliği süreci detaylı bir şekilde deneysel olarak incelenmiştir. Akım şiddetinin oyulmaya etkisinin büyük olması ile birlikte medyan dane çapının artmasıyla denge oyulma derinliğinin farklı oranlarda azaldığı sonucuna varılmıştır.

Keywords

• labirent yan savak

The Influence of Bed Material Grain Size on Scouring for Labyrinth Side Weir Flow

Abstract

With labyrinth weirs, the effective crest length can be increased and more water can be discharged than conventional weirs. Labyrinth weirs play a major role in flood control without damaging the hydraulic structures such as dam, check dam. For this reason, more studies are needed on the labyrinth side weirs in hydraulic engineering. The aim of this study; is to examine the values that the equilibrium scour depth will reach around the labyrinth side weir placed in an open channel. The minimization of the equilibrium scour depth is very important to ensure that the hydraulic structure in question is not destroyed. As it is known, the scour depths formed in the labyrinth side weir flow are less than the conventional side weirs. In this study, a series of experiments were performed by changing the dimensions of the bed material. The experiments were conducted for different discharges. Accordingly, the equilibrium scour depth change around the labyrinth side weir at the end of 9 hours was investigated. As a result; It was determined that the equilibrium scour depth was increased with increasing flow intensity, and the equilibrium scour depth was decreased by increasing the median grain size of the bed material.

References

1. [1] Tunc, M., and Emiroğlu, M. E., Experimental Investigation of Sediment Transport for Side Weir Flow, Journal of Water Resources, 2019, 4(1), 1-11.
2. [2] Emiroglu, M. E., and Kaya, N., Discharge coefficient for trapezoidal labyrinth side weir in subcritical flow, Water resources management, 2011, 25(3), 1037-1058.
3. [3] Borghei, S. M., Nekooie, M. A., Sadeghian, H., and Ghazizadeh, M. R. J., Triangular labyrinth side weirs with one and two cycles, Proceedings of the ICE-Water Management, 2012, 166(1), 27-42.
4. [4] Emin Emiroglu, M., Cihan Aydin, M., and Kaya, N., Discharge Characteristics of a Trapezoidal Labyrinth Side Weir with One and Two Cycles in Subcritical Flow, Journal of Irrigation and Drainage Engineering, 2014, 140(5).
5. [5] Emiroglu, M. E., Gogus, M., Tunc, M., and Islamoglu, K., Effects of Antivortex Structures Installed on Trapezoidal Labyrinth Side Weirs on Discharge Capacity and Scouring, Journal of Irrigation and Drainage Engineering, 2017, 143(6), 04017006.
6. [6] Tunç, M., and Emiroğlu, M. E., Investigation of Live-Bed Scour at Labyrinth Side Weirs, Firat University Turkish Journal of Science & Technology, 2018a, 13(1), 129-136.
7. [7] Rosier, B., Boillat, J. L., and Schleiss, A. J., Influence of lateral water withdrawal on bed form geometry in a channel, Journal of Hydraulic Engineering, 2011, 137(12), 1668-1675.
8. [8] Onen, F., and Agaccioglu, H., Live Bed Scour at A Side Weir Intersection Located on an Alluvial Channel, Irrigation and Drainage, 2013, 62(4), 488-500.

9. [9] Paris, E., Solari, L. and Bechi, G., Applicability of the De Marchi hypothesis for side weir flow in the case of movable beds, Journal of Hydraulic Engineering, 2012, 138(7), 653-656.
10. [10] Novak P., and Cabelka J., Models in Hydraulic Engineering, Pitman Publishing Limited, London. 1981.
11. [11] Tunç, M., Emiroğlu, M.E., Doğan, Y., and Kaya, N., The Effect of Anti-vortex Plates on Scouring at Labyrinth Side Weirs, 8 th International Advanced Technologies Symposium, 2017,3826-3833.
12. [12] Tunç, M., and Emiroğlu, M.E., Relationship between sediment transport and scour geometry for high flow velocities at the labyrinth side weir, 5th International Symposium on dam Safety, 2018b,462-470.
13. [13] Dey, S., and Raikar, R. V., Scour below a high vertical drop, Journal of Hydraulic Engineering, 2007, 133(5), 564-568.
14. [14] Melvılle, B. W., and Chiew, Y. M., Time scale for local scour at bridge piers, Journal of Hydraulic Engineering, ASCE, 1999, 125(1), 59-65.
15. [15] Tunç, M., Emiroğlu, M. E., Effect of labyrinth side weirs on topography of the movable bed, International Civil Engineering Architecture Conference (ICEARC’xx19), 2019,861-869.