Embankments play a vital role in flood control engineering systems,and any breach in these embank-ments can result in severe disaster losses.Therefore,it is crucial to understand the relationship between the devel-opment rate of embankment breaches and hydraulic factors to accurately predict breach processes and flood evolu-tion.By analyzing experimental data from series breach tests of non-cohesive sandy embankments,we obtained the relationship between hydraulic factors(discharge and unit-width discharge)and breach development rates(trans-verse widening rate and vertical down-cutting rate).Findings reveal two major developments of breach,namely,transverse widening and vertical down-cutting.Breach discharge rate is positively correlated with breach develop-ment rate,although the specific relationship depends on inflow conditions,making it difficult to express uniformly for all experimental scenarios.Nonetheless,an exponential relationship exists between unit-width discharge and breach development rate.Based on this relationship,a calculation model is established with unit-width discharge as a parameter to simulate and analyze the development process of breaches,including transverse widening and vertical down-cutting.The results demonstrate a strong agreement between the simulated situation and the actual breach de-velopment process,thus confirming the accuracy,scientific validity,and simplicity of the calculation model.
关键词
非黏性堤防/溃口流量/溃口单宽流量/下切速率/展宽速率/溃口发展过程计算模型
Key words
non-cohesive embankment/breach discharge/unit-width discharge at breach/down-cutting rate/transverse widening rate/computational model of breach development process
维普
万方数据