抄録
3-dimensional flow structure in meandering channels during flood is discussed based on the velocity measurements results by 2-component fiber optic laser Doppler anemometer. Growth and decay processes of secondary flow cells in meandering channels and their differences between before and alter inundation are particularly highlighted. Interaction between the lower layer flow (the main channel), and the upper layer flow (the flood plain) is also stressed. The matters pointed out in the paper are: closely related to the energy loss mechanism in compound meandering flows and should therefore properly be estimated in mathematical or numerical methods for engineering purposes.
