In this paper the effect of different curvatures on spatial variation of coherent flow structure and bursting events inside two multi-bend meanders models with the strong and mild curved are investigated. Two models with three sequential meanders were built and three dimensional flow velocities at five cross sections were measured using Micro-ADV. Based on orthogonal analysis of three dimensional flow velocity, bursting events are classified into two classes and eight zones. The results indicated that the effect of curvature in sequential bends is obvious in model 1. In two models, the occurrence probabilities of sweep and ejection events are higher than outward and inward interactions. The minimum contribution probability is found for zone III-B. The above results can be useful to find meandering pattern inside the rivers and also for river training works
