Articles | Volume 19, issue 10
Research article
05 Oct 2015
Research article |  | 05 Oct 2015

A methodological approach of estimating resistance to flow under unsteady flow conditions

M. M. Mrokowska, P. M. Rowiński, and M. B. Kalinowska

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Cited articles

Albayrak, I. and Lemmin, U.: Secondary currents and corresponding surface velocity patterns in a turbulent open-channel flow over a rough bed, J. Hydraul. Eng.-ASCE, 137, 1318–1334,, 2011.
Aricó, C., Tuciarelli, T., Dottori, F., Martina, M., and Todini, E.: Peak flow measurement in the Arno river by means of unsteady-state water level data analysis, in: Proc. International Conference on Fluvial Hydraulics, River Flow 2008, 3–5 September 2008, Cesme, Izmir, Turkey, 2008.
Aricó, C., Nasello, C., and Tucciarelli, T.: Using unsteady-state water level data to estimate chanel roughness and discharge hydrograph, Adv. Water Resour., 32, 1223–1240,, 2009.
Bombar, G., Elci, S., Tayfur, G., Guney, M. S., and Bor, A.: Experimental and numerical investigation of bed load transport under unsteady flows, J. Hydraul. Eng.-ASCE, 137, 1276–1282,, 2011.
Chow, V.: Open-channel hydraulics, The Blackburn Press, New Jersey, USA, 1959.
Short summary
This paper presents evaluation of resistance parameters: friction slope, friction velocity and Manning coefficient in unsteady flow. Theoretical description is facilitated with the analysis of field data from artificial dam-break flood waves in a small lowland watercourse. The methodology to enhance the evaluation of resistance by relations derived from flow equations is proposed. The study shows the Manning coefficient is less sensitive to simplified relations than other parameters.