ABSTRACT

To quantify the discharge capacity of grate inlets causing urban flooding due to insufficient drainage capacity, 285 experiments for six grate inlets under different approaching discharges, transverse and longitudinal slopes conditions were conducted using 1:1 scale experiment. These experiments indicated: (1) A smaller approaching discharge or a larger transverse slope leads to a higher interception efficiency. The longitudinal slopes weakly influence the interception efficiency of parallel grate inlets. The parallel grate inlet is preferred for its much higher interception efficiency than vertical grate inlet. (2) Six interception efficiency formulas with clear physical meanings using dimensional analysis have been proposed. (3) The average errors of the six current formulas are −1.26%–8.2%. This study can guide the planning and design of urban drainage systems.

摘要

为了量化因排水能力不足而导致城市洪水的篦篦入口的排水能力，使用 1:1 的比例试验，在不同的接近流量、横向和纵向坡度条件下对六个篦篦入口进行了 285 次实验。这些实验表明：（1）较小的接近流量或较大的横向坡度导致更高的拦截效率。纵向坡度对平行炉排入口的截流效率影响很小。平行炉排入口是首选，因为它比垂直炉排入口高得多的拦截效率。(2) 提出了六个物理意义明确的利用量纲分析的截留效率公式。(3) 目前六个公式的平均误差为-1.26%~8.2%。