From the result of laboratory experiment, in a compound meandering channel, we suggested the possibility of inner bank erosion due to channel plan shape and flood scale (relative depth ratio, duration). Actually, we received report of inner bank erosion in natural river flood.
In this reseach, bed topography of inner bank of main channel in meandering compound river was studied. For the investigation, at first we bored some circular holes on inner bed, and then filled by painted soil of different color in six layers. We measured maximum depth of erosion at inner bed by the indication of colored sediment after the flood. It was observed from the investigation that the erosion occured at inner bed for long period and large scale flood.