J. Ma, W. G. Song, S. M. Lo and Z. M. Fang (2013) New insights into turbulent pedestrian movement pattern in crowd-quakes. Journal/Journal Of Statistical Mechanics-Theory And Experiment 22. [In English]
Web link: http://dx.doi.org/10.1088/1742-5468/2013/02/p02028
Keywords: turbulence, traffic and crowd dynamics, VELOCITY INCREMENTS, GAME-THEORY, MODEL, SIMULATION, EVACUATION, DYNAMICS, BEHAVIOR, FLOWS
Abstract: Video recordings right before the Love Parade disaster have been quantitatively analyzed to explore the bursts of unusual crowd movement patterns, crowd-quakes. The pedestrian movement pattern in this incident was special for the reason that it happened in a congested counter flow scenario, where stopped pedestrians were involved. No one was believed to have pushed others intentionally at the beginning, however, under this situation, the body contacts among the pedestrians still induced a force spread, which then led to velocity fluctuation. As indicated by the individual velocity-related features, the densely crowded pedestrian movement displayed turbulent flow features. Further analyzing the overall flow field, we also found that the pedestrian flow field shared typical patterns with turbulent fluid flow. As a result of the turbulent state, different clusters of pedestrians displayed different velocity features. Thus crowd pressure which took into account the velocity and density information was proved to be a good indicator of crowd disasters. Based on these essential features of pedestrian crowd-quakes, a minimal model, i.e., a pedestrian crowd-quake model, was established. Effects including pedestrian gait, stress conservation level and personal intention to escape were explored.