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A01-Zic-Vranjes-Ozanic.pdf

A01-Zic-Vranjes-Ozanic - Methods of Roughness Coefficient ...

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Cvetanka Popovska - Microsoft Word - A01-Zic.doc - International Symposium on Water Management and Hydraulic Engineering Ohrid/Macedonia 1-5 September 2009 Paper: A01 Methods of Roughness Coefficient Determination in Natural Riverbeds Elvis ic1 Mijo Vranje 2 Nevenka O ani 1 1University of Rijeka Faculty of Civil Engineering Rijeka Croatia e-mail: elvis.zic@gradri.hr 2University of Split Faculty of Civil Engineering Split Croatia Abstract. The roughness coefficient determina tion in natural river beds is based on the analysis of boundary layer development along the canal walls. The structure of the open canal can be very complex and changeable which results in different evaluation methods of determining the roughness coefficient n. A considerable number of measured valu ed for similar surface canal characteris- tics are analyzed in order to determine the roughness coefficient for the ob- served natural canal. The paper offers parameters which affect the roughness coefficient variability in beds. The roughness coefficient variability along the flow which depends on water level changes has been additionally described and graphically presented. The paper presents the vertical velocity profiles which are result of the aquatic vegetation. The paper offers review of the most repre- sented methods of roughness coefficient ev aluation used in practice as well as numerous empiric methods based on the grading structure of the slopes and the bottom of the canal as well as methods based on measuring data. Keywords: Roughness coefficient boundary layer ev aluation methods vertical velocity profile 1 Introduction Determination of the roughness coefficient presents a provocative and a creative task of the contemporary hydraulics of open flows. An initially simple determination of the roughness coefficient n becomes a very complex problem because the coefficient has been changing in time and space depe nding on geometric geomorphological and hydraulic parameters of water current beds. It is an interdiscip linary task because it includes the knowledge of hydrology statistical data processing hydromechanics hydraulics geology and mechanics.

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