Author(s): P. Rameshwaran; B. B. Willetts
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Keywords: No Keywords
Abstract: The paper reports the findings of small-scale experiments on overbank flow in two-stage meandering channel systems. Eight geometric parameters were investigated, namely main channel sinuosity (r_ (mc)), aspect ratio (AR_ (mc)), cross-sectional shape and bank side slope (SS_ (mc)), flood plain roughness (k_ (jp)) and longitudinal slope (S_ (jp)), meander belt width relative to flood plain width (MBW/FW) and flood bank sinuosity (r_ (jp)). Observations were made of the mixing mechanism of the flood plain and main channel flow which influences energy losses. The effect of some of these parameters is presented through stage-discharge relationships. Energy losses are analysed in term of Darcy-Weisbach resistance coefficients for the case involving straight flood banks. Scale effects in such flows are investigated using data from the UK Flood Channel Facility (UK-FCF). The paper presents a possible approach to estimation of the Darcy-Weisbach resistance coefficient for two-stage meandering channels in the roughness dominated flow region.
Year: 1997