Author(s): Muto Yasunori; Ishigaki Taisuke; Kondo Haruki
Linked Author(s): Yasunori Muto, Taisuke Ishigaki
Keywords: Embayment; Groyne; Meandering channel; Experiment
Abstract: Flow structure in a meandering channel with a series of embayments is explored experimentally. 4 depth conditions, i.e. groyne-nonsubmerged, bankfull, low-flooding and high-flooding are studied. Water surface profiles, velocity distributions and sediment deposition patterns were measured. How the fast and slow flows, and resultant deposited areas, are formed in the meandering geometry, and their variations due to depth change, are of particular interest. The results enable to classify the embayments according to their hydromorphdynamic characteristics. For overbank cases, flow and deposition in the embayments are strongly affected by the flow interaction in compound meandering flow. Due to the deceleration and acceleration when overtopping the main channel, hydro-morphdynamic conditions in the embayments are totally changed from those for inbank flows. An important function of head works of the groynes, set parallel to the flow direction, is also indicated through the analyses.
Year: 2010