Velocity Distribution at Contraction Zone Around Bank–Protection Structures

• Abdul Kareem S. Shehab

  Civil Engineering Department - Omar Al-Mukhtar University - Libya.

  Author

In this study, some observations at the zones of streamflow around bank– protection structures were discussed, and their characteristics were fixed, and were divided into three zones: afflux, contraction and expansion. The contraction zone was also, divided into subzones according to their deformation and distortion due to the disturbance which happens from the structure. It was found analytically that, in two zones the velocity distribution pattern similar to that, which was given in the theory of turbulence of Schlichting–Abramovich. Also the backward–velocity distribution profiles were studied with their characteristics and formation. A formula for calculating backward–velocity distribution was derived at the zone of contraction using integral relationship of the discharge at the section in the velocity distribution profile which, was obtained from the results of author’s experiments. This study can be useful to calculate the lengths and velocities of the different flow zones, also during river diversion works, for calculating permissible velocities, protection of banks against scouring or erosion and for river training works.

Abrarnovich G. N. (1960). Theory of Turbulent Flow (Physmatgiz). Moscow. Pp: 716.

Abdul Kareem S. Shehab. (1991). The Laws of Streamflow distortion around spur–dike constructed on rivers with a wide flood plains. Ph. D. dissertation submitted to the Institute of Hydro–land Reclamation. Moscow, Pp: 150.

Avrova T. F. (1971). Hydraulics of flow in contraction and expansion zones around cofferdams. Journal of LPI, No. 312. P; 15–20.

Mikhalev, M. A. (1971), Hydraulic Calculations of flow during contraction. (Energia) Leningrad, 184 pp.

Rajaratnam N., Ahmadi R. (1981). Hydraulics of channels with flood plains. Journal of Hydraulic Research–IAHR–Vol. 9. No. 1 p: 43–60.

Schlichting, 1-1. (1968). Boundary Layer Theory. McGraw–Hill Book Co., New York, pp: 170.

Ven Te Chow (1983). Open channel hydraulics. Mcgraw–Hill Book Co. N. Y. pp: 680.

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