MATHEMATICAL MODELLING OF STEPPED SPILLWAYS AERATION ON THE RIVERS

Abstract

Dissolved oxygen content (DO) is one of the most important water quality parameter in rivers and streams. Hydraulic structures may cause significant impacts on the river water dissolved oxygen concentrations. The oxygen transfer across the air-water interface at a hydraulic structure such as a weir or spillway occurs by self-aeration along the chute and by flow aeration in the hydraulic jump at the downstream end of the structure. In this study; stepped spillway was created small size in a channel. Dissolved oxygen concentrations were measured on this model with various flow rates of water by passing weir. In the light of measured values along the canal, a mathematical model has been developed to how to show a change of oxygen concentration.

Keywords

• oxygen transfer, dissolved oxygen, stepped spillway, mathematical modeling

References

1. Aras E., and Berkun M., (2006). Aeration On Stepped Spillways And Its Effects On Stream
2. Reaeration, Seventh International Congress on Advances in Civil Engineering, October 11- , 2006,Yildiz Technical University, Istanbul, Turkey
3. Aras E., (2009). Effects of Aeration through the Hydraulics Structures on Dissolved Oxygen
4. Balance in Rivers and on the Optimization of Wastewater Treatment System (in Turkish). PhD Thesis, Karadeniz Technical University, Department of Civil Engineering, Trabzon, Turkey. Avery, S.T. and Novak, P. (1978). Oxygen Transfer at Hydraulics Structures, JI of Hyd. Div., ASCE, Vol.104, No.HY11, 1521-1540.
5. Baylar, A., Bagatur, T. ve Emiroğlu, M.E., (2007). Prediction of Oxygen Content of Nappe,
6. Transition, and Skimming Flow Regimes in Stepped-Channel Chutes, Journal Of Environmental Engineering And Science, 6, 2, 201-208. Berkun, M. and Aras, E., (2007). Parametric Evaluation Of Stream Water Dissolved Oxygen
7. Deficit Profile, Environmental Management Science, Mary Ann Liebert, 24, 10, 1389-1398.
8. Bowie, G.L., Mills, W.B., Porcella, D.B., Campell, C.L., Pagenkopf, J.R., Rupp, G.L., Johnson, K.M., Chan, P.W.H., Gherini, S.A. ve Chamberlain, C.E., (1985). Rates, Constants and Kinetics Formulations in Surface Water Quality Modeling. Second Edition,

9. Environmental Research Laboratory, Office of Research and Development, United States Environmental Protection Agency, Athens, Georgia. Chanson, H., (1994). Hydraulic Design of Stepped Cascade, Channels, Weirs and Spillways,
10. Elsevier Science Ltd., 261p., Oxford, England. Frizell, K.H. (1992) Hydraulics of Stepped Spillways for RCC Dams and Dam Rehabilition
11. Proc. 3nd. Specialty Conf. on Roller Compacted Concrete, ASCE, 423-439, USA. Hibbs, H.E. ve Gulliver, J.S., (1997). Prediction of Effective Saturation Concentration at
12. Spillway Plunge Pools, Journal of Hydraulic Engineering, ASCE, 123, 11, 940-949.