Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper pr...Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper presents a straightforward and efficient approach to an urban distributed runoff model(UDRM).The model is developed to quantify the discharge and water depth within urban drainage pipe networks under varying rainfall intensities and land-use scenarios.The Nash efficiency coefficient of UDRM exceeds 0.9,which indicates its high computational efficiency and potential benefit in predicting urban flooding.The prediction of drainage conditions under both current and re-planned land-use types is achieved by adopting different flood recurrence intervals.The findings reveal that the re-planned land-use strategies could effectively diminish flood risk upstream of the drainage pipe network across 20-year and 50-year flood recurrence intervals.However,in the case of extreme rainfall events(a 100-year flood recurrence),the re-planned land-use approach fell short of fulfilling the requirements necessary for flood disaster mitigation.In these instances,the adoption of larger-diameter drainage pipes becomes an essential requisite to satisfy drainage needs.Accordingly,the proposed UDRM effectively combines land-use information with pipeline data to give practical suggestions for pipeline modification and land-use optimization to combat urban floods.Therefore,this methodology warrants further promotion in the field of urban re-planning.展开更多
在城市内涝模拟中,通常通过设置排水管网边界水位将河道纳入考虑范围,这种方法不适用排水管网流量对城市内河影响显著的情境。以C市J区中部为例,利用Info Works ICM模型,模拟不同设计暴雨重现期时,城市排水管网与河道之间的相互影响。...在城市内涝模拟中,通常通过设置排水管网边界水位将河道纳入考虑范围,这种方法不适用排水管网流量对城市内河影响显著的情境。以C市J区中部为例,利用Info Works ICM模型,模拟不同设计暴雨重现期时,城市排水管网与河道之间的相互影响。结果表明,当排水管网出流量对河道影响显著时,会导致管道接入内河处上游的流量和流速下降,降低河道的排涝能力:节点H2处上游流量下降1.6m3/s左右,流速下降0.58m/s左右。同时内河水位的上升也会导致排水管网处于淹没出流状态,重现期从1a增加到10a,管段66的淹没出流开始时间提前10min左右,淹没出流结束时间推迟2 h,淹没时长增加,最大淹没水深也随之增加。因此在城市排水管网建模进行内涝分析时,需要全面考虑排水管网与河道之间的相互影响,建立排水管网与河道耦合的模型。展开更多
基金supported by the National Key Research and Development Program of China(Grant No.2022YFC3202002)the National Natural Science Foundation of China(Grant Nos.52025092,52209087 and 52379065).
文摘Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper presents a straightforward and efficient approach to an urban distributed runoff model(UDRM).The model is developed to quantify the discharge and water depth within urban drainage pipe networks under varying rainfall intensities and land-use scenarios.The Nash efficiency coefficient of UDRM exceeds 0.9,which indicates its high computational efficiency and potential benefit in predicting urban flooding.The prediction of drainage conditions under both current and re-planned land-use types is achieved by adopting different flood recurrence intervals.The findings reveal that the re-planned land-use strategies could effectively diminish flood risk upstream of the drainage pipe network across 20-year and 50-year flood recurrence intervals.However,in the case of extreme rainfall events(a 100-year flood recurrence),the re-planned land-use approach fell short of fulfilling the requirements necessary for flood disaster mitigation.In these instances,the adoption of larger-diameter drainage pipes becomes an essential requisite to satisfy drainage needs.Accordingly,the proposed UDRM effectively combines land-use information with pipeline data to give practical suggestions for pipeline modification and land-use optimization to combat urban floods.Therefore,this methodology warrants further promotion in the field of urban re-planning.
文摘在城市内涝模拟中,通常通过设置排水管网边界水位将河道纳入考虑范围,这种方法不适用排水管网流量对城市内河影响显著的情境。以C市J区中部为例,利用Info Works ICM模型,模拟不同设计暴雨重现期时,城市排水管网与河道之间的相互影响。结果表明,当排水管网出流量对河道影响显著时,会导致管道接入内河处上游的流量和流速下降,降低河道的排涝能力:节点H2处上游流量下降1.6m3/s左右,流速下降0.58m/s左右。同时内河水位的上升也会导致排水管网处于淹没出流状态,重现期从1a增加到10a,管段66的淹没出流开始时间提前10min左右,淹没出流结束时间推迟2 h,淹没时长增加,最大淹没水深也随之增加。因此在城市排水管网建模进行内涝分析时,需要全面考虑排水管网与河道之间的相互影响,建立排水管网与河道耦合的模型。
