Bileşik Kesitli Kanallarda İkincil Akımların Etkisi

Öz

Bu çalışmada, bileşik kesitli kanallarda debi hesaplamasında ikincil akımların etkisi Shiono-Knight Metodu (SKM) ile araştırılmıştır. Literatürde yayınlanmış ve laboratuar ortamında ölçülmüş debiler SKM kullanılarak hesap edilmiştir. İkincil akımların etkisi, hesaplanan ve gözlenmiş debiler arasındaki ortalama mutlak rölatif hataya bakılarak belirlenmiştir. İkincil akımların debi hesaplamasında etkisinin olduğu ve rölatif derinlik arttıkça bu etkinin azaldığı görülmüştür.

Anahtar Kelimeler

• Bileşik kesitli kanallar, Shiono-Knight Metodu, İkincil akımlar

The Effect Of Secondary Flows In Compound Channels

Öz

In this study, the effect of secondary flows on the conveyance capacity of the compound channels was investigated by Shiono-Knight Method (SKM). Discharges, which were observed and published in the literature, were calculated using SKM. The effect of secondary flows was determined with the mean absolute relative error between observed and computed discharges. It was determined that the secondary flows have an effect on the calculation of the conveyance capacity, and this effect decreases with an increase in relative depth.

Anahtar Kelimeler

• Compound channel, Shiono-Knight Method, Secondary flows

Kaynakça

1. 1. Bousmar, D. 2002. Flow modelling in compound channels–Momentum transfer between main channel and prismatic or non–prismatic floodplains. PhD Thesis, Universite Catholique de Louvain.
2. 2. Sellin, R.H.J. 1964. A laboratory investigation into the interaction between the flow in the channel of a river and that over its flood plain. La Houille Blanche, 7, 793–802.
3. 3. Zheleznyakov, G.V. 1965. Interaction of Channel and Floodplain Streams. Proceeding 14th Congress of IAHR, 5, Paris, France, 144–148.
4. 4. Rajaratnam, N. and Ahmadi, R. 1979. Interaction between Main Channel and Floodplain Flows. Journal of Hydraulics Division, 105, No. HY5, 573–588.
5. 5. Wormleaton, P.R., Allen, J. and Hadjipanos, P. 1982. Discharge Assessment in Compound Channel Flow. Journal of the Hydraulics Division–ASCE, 108, 975–994.
6. 6. Knight, D.W. and Demetriou, J.D. 1983. Flood–Plain and Main Channel Flow Interaction. Journal of Hydraulic Engineering–ASCE, 109, 1073–1092.
7. 7. Knight, D.W. and Hamed, M.E. 1984. Boundary Shear in Symmetrical Compound Channels. Journal of Hydraulic Engineering–ASCE, 110, 1412–1430.
8. 8. Shiono, K. and Knight, D.W. 1989. Two dimensional analytical solution compound channel. Proceeding of 3rd International Symposium on refined flow modeling and turbulence measurements, Universal Academy Press, 591–599.

9. 9. Shiono, K. and Knight, D.W. 1991. Turbulent Open–Channel Flows with Variable Depth across the Channel. Journal of Fluid Mechanics, 222, 617–646.
10. 10. Knight, D.W., Shiono, K. and PIRT, J. 1989. Prediction of depth mean velocity and discharge in natural rivers with overbank flow. Proceedings of the Conference on Hydraulics and Environmental Modelling of Coastal, Estuarine and River Waters, eds. Falconer, R.A., Goodwin, P. and Matthew, R.G.S., Gower Publishing, 419–428.
11. 11. Ackers, P. 1992. Hydraulic Design of 2–Stage Channels. Proceedings of the Institution of Civil Engineers–Water Maritime and Energy, 96, 247–257.
12. 12. Ackers, P. 1993. Flow Formulas for Straight 2–Stage Channels. Journal of Hydraulic Research, 31, 509–531.
13. 13. Seçkin, G. 2004. A comparison of one–dimensional methods for estimating discharge capacity of straight compound channels. Canadian Journal of Civil Engineering, 31, 619–631.
14. 14. Omran, M. 2008. New developments in predicting stage–discharge curves. velocity and boundary shear stress distributions in open channel flow. Water and Environment Journal, 22, 131–136.
15. 15. Chlebek, J. 2009. Modelling of Simple Prismatic Channels with Varying Roughness Using The SKM and a Study of Flows in Smooth Non–Prismatic Channels with Skewed Floodplains. PhD thesis, University of Birmingham, Birmingham, UK.
16. 16. Abril, J.B. and Knight, D.W. 2004. Stabilising the Paute River in Ecuador. Civil Engineers, Institute of Civil Engineers, London, 157, 32–38.
17. 17. Chlebek, J. and Knight, D.W. 2006. A new perspective on sidewall correction procedures, based on SKM modelling. River Flow 2006, Vols 1 and 2, 135–144 2247.