【摘要】 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。更多还原

【Abstract】 In order to more accurately calculate flood diversion process,taking Baijiadian breach gap in Sihe river as an example,one-dimensional unsteady flow model was used to simulate breach flood process about four forms.Given hydrological and hydraulic conditions,and assumption collapse development,the results show that instant collapse form’s flood volume and peak are the largest,and vertical-horizontal gradually collapse form’s flood volume and peak are the minimum,which gap development in vertical and horizontal direction conforms to actual collapse process,the development trend of collapse discharge and water level process in vertical gradually collapse form and horizontal gradually collapse form are basically consistent.In the case of results without obvious difference,instant collapse form is safety for flood control,and the research can provide reference for flood diversion calculation.更多还原