Research on desilting scheme of combined drainage network in Beijing Core Area based on SWMM
Sediment accumulation in pipelines can have a detrimental impact on the drainage ca-pacity of urban pipeline networks.Every year,one of the crucial tasks in flood prevention and con-trol in Beijing is to conduct dredging of the drainage pipeline network prior to the flood season.However,due to the narrow streets in the core area of Beijing,inadequate working conditions for dredging operations,and non-compliance of most pipelines with design standards,a significant number of pipelines accumulate sediment annually.Completing all dredging work before the flood season poses a challenge.Therefore,determining the key dredging pipelines in the area and promptly restoring the drainage capacity of the pipeline network is essential to guide the dredging work of the drainage pipeline network in the core area of Beijing.This article focuses on the drain-age pipeline network in a confluence area of the core of Beijing.Based on the Storm Water Manage-ment Model(SWMM),this study examines pipeline sedimentation risk assessment,the necessity of dredging at different sedimentation levels,and key pipeline selection criteria for dredging.The results reveal that in a scenario where 40％sedimentation exists in the entire pipeline network and the recurrence interval of heavy rainfall does not exceed five years,dredging 25.2％of the total length of key pipelines is sufficient to restore overflow node numbers to a non-sedimentation state.The maximum overflow time of the nodes,the total outflow of the discharge port,and the change in peak discharge value of the discharge port are more than 85.0％,76.0％,and 69.5％,respec-tively,of the total dredging changes of all pipeline segments.This indicates that the key pipeline dredging method can significantly restore the drainage capacity of the area over a broad range.O-verall,the findings of this study highlight the importance of identifying and prioritizing key pipe-lines for dredging in the core area of Beijing,thereby facilitating a timely response to restore the drainage capacity of the pipeline network.
万方数据
维普
