PLAN SHAPE FEATURES IN COMPOUND MEANDERING CHANNELS AND CLASSSIFICATION DIAGRAM OF FLOOD FLOWS BASED ON SINUOSITY AND RELATIVE DEPTH

摘要

The objective of this study is to clarify the representative parameters governing flow characteristics in compound meandering channels in order to make sense of the results of experimental channel and river flows. Plan shape parameters were considered from field data from eleven compound meandering rivers in Japan. Hydraulic parameters were also studied by conducting a series of experiments with various sinuosity and relative depths. Laboratory results were then compared with results of flood flow analysis using aerial photographs. Finally, a classification diagram of the occurrence of the flood flows in compound meandering rivers was devised on the basis of these representative parameters such as sinuosity, relative depth, location of the maximum velocity filament and the maximum scouring depth at the meander apex section.