Recent field measurements of mobile-bed roughness in selected streams in Czech Republic are described. The results are collected in a database organized to a www catalogue. The field results of the bed roughness in two gravel-bed streams under flash flood conditions are discussed. A methodology is suggested for evaluation of the bed roughness of straight channels transporting sediments. A prediction of the bed roughness under the condition of intense sediment transport in the upper plane bed regime is demonstrated on the results of laboratory pressurized-pipe tests. An application to flood conditions in a steep mountain creek is shown in a case study.
Faculty of Civil Engineering, Department of Hydraulics and Hydrology, Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic
Bibliografia
Matoušek, V. 2009a. Roughness of mobile bed at high shear stress: applications for enclosed pipes and open channels. Proceedings of 12th International Scientific Conference, Brno, CzechRepublic.
Matoušek, V. 2009b. Concentration profiles and solids transport above stationary deposit in enclosed conduit. Journal of Hydraulic Engineering, ASCE, 135(12), 1101-1106.
Matoušek, V., Krupička, J. 2009. On equivalent roughness of mobile bed at high shear stress. Journal of Hydrology and Hydromechanics, 57(3), 191-199.
Matoušek, V., Krupička, J. 2010. Bed roughness at high bed shear in open channels and pressurized pipes. Proceedings of River Flow 2010, Braunschweig, Germany.