Abstract: A new technology for emergency rescue of embankment breaches based on anchor arrays was proposed in the paper,which is much different from traditional construction methods.By deploying anchor arrays in the flow field of the breach to block water effectively and quickly reduce the flow velocity near the breach,supplying the opportunity to make the breach head being protected and occupied.Therefore,the water blocking effect of the array anchor in the breach flow field is the key factor determining the occupancy efficiency.Typical hydraulic boundary conditions for breach were selected in the paper,and the water blocking anchor array was generalized as a cylindrical pipe pile array.Taking the flow field of breach arranged in three arrays (plum blossom,fish swarm,rectangle) as the research object,three-dimensional hydrodynamic mathematical model was established,and the hydrodynamic numerical simulation of the water blocking effect of the array was conducted by adopting pile type,area density of piles array,pile space,and flow intensity as the main impact factors.Based on analysis of hydraulic characteristics such as flow state,velocity distribution,water surface gradient,and turbulent energy dissipation in different array flow fields,it is indicated that large-scale vortices and oscillatory waves formed in the staggered arrangement of pipe pile arrays contribute to increasing local resistance in the pipe pile area and slowing down the nearshore flow velocity.The Plum Blossom pile array behaves better in decreasing the nearshore flow velocity,with a decrease of 1.0~1.9m/s on the right and 0.45~1.2m/s on the left.The fall of water surface in the breach area is large,and the turbulent energy would increase along the flow direction,and the increasing amount is related to the shape of the pile array; The turbulent energy and dissipation rate in the flow field of the plum blossom pile array are significantly bigger than the other two array types,and are 13.33 times than the maximum turbulent energy without pipe piles,which indicates the significant energy dissipation effect.The area density of piles array would affect the strength of the vortex and the interaction between the wake vortexes,and plays an important role in energy dissipation and velocity reduction of the flow near the breach,which performs optimally as the pile spacing distance is 2.7D.The research results might benefit for the design of breach anchor arrays and the deployment of protective pipe piles.