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为较精确计算不同溃口演变过程下的溃决分洪过程,采用一维非恒定流水动力模型,以泗河白家店溃口为例分别对瞬间溃、纵向渐变溃、横向渐变溃及纵横向渐变溃共4种堤防溃决形式进行分洪计算。在既定的水文水力条件及溃口演变等假定下,计算结果表明,瞬间溃形式的溃决洪峰及洪量均为最大;纵横向渐变溃形式的溃口在纵向及横向为二维演变,较符合实际溃决演变过程,其溃决洪峰及洪量均为最小;纵向渐变溃与横向渐变溃形式的溃决流量及水位过程发展趋势基本一致。在计算结果差别不大的情况下,采用瞬间溃形式进行分洪计算有利于防洪安全。研究结果可为分洪计算提供参考。
In order to accurately calculate the process of flood catastrophe under the different breaches, a one-dimensional unsteady hydrodynamic model was adopted. Taking Baijiadian breach in Sihe River as an example, the effects of instantaneous collapse, longitudinal gradient collapse, lateral gradient collapse and vertical and horizontal gradient collapse Four types of dike breakout flood diversion calculation. Under the given hydrological and hydraulic conditions and the evolution of the breach, the calculated results show that the instantaneous collapses have the largest flood peak and flood amount, and the vertical and horizontal collapsible breaches have a two-dimensional evolution both longitudinally and horizontally, which is in line with the actual collapse and evolution And the flood peak and flood volume of the collapse were the smallest. The trend of the collapse flow and the water level process of longitudinal gradient collapse and horizontal gradient collapse basically coincided with each other. In the case of small difference between the calculated results, the use of instantaneous collapse form of flood diversion calculation is conducive to flood control and safety. The results can provide a reference for flood diversion calculation.