基于不同模拟方法的城市下立交区域内涝模型比对及适用性分析

Comparison&Applicability Analysis of Waterlogging Models in Urban Lower Interchange Area Based on Different Simulation Methods

随着全球气候变化加剧及我国城市化的快速发展,城市内涝已成为影响城市安全的一个重要因素。城市内涝中,下立交是内涝发生的常见区域,也是城市内涝防御的重点。排水模型作为一种新型技术手段目前广泛使用于城市内涝成因的分析与改造方案的复核。首先,对水文水动力与水动力2种模拟方法进行原理说明,并进行立交场景适用性分析;然后,以青岛市某立交桥为研究对象,通过3场实测降雨对2种模拟方法产生的结果进行验证比对。研究结果表明:建立局部内涝点的精细化模型时,在地形、管网等数据质量较好的情况下应优先选择水动力方法;尤其在进行坡度较大的积水点模拟时,水动力方法的准确程度要明显高于目前普遍采用的水文水动力方法。

With the intensification of global climate change&the rapid development of urbanization in China,urban waterlogging has become an important factor affecting urban security.In urban waterlogging,lower overpass is not only a common area of waterlogging,but also the focus of urban waterlogging prevention.As a new technical means,drainage model is widely used to analyze the causes of urban waterlogging and review the reconstruction scheme.Firstly,the principles of hydrological hydrodynamic and hydrodynamic simulation methods are explained,and the applicability of interchange scene is analyzed;then,taking an overpass in Qingdao as the research object,the results of the two simulation methods are verified and compared through three measured rainfall.The results show that when establishing the refined model of local waterlogging points,the hydrodynamic method should be preferred under the condition of good data quality such as terrain and pipe network;especially in the simulation of ponding points with large slope,the accuracy of hydrodynamic method is significantly higher than that of the commonly used hydrodynamic method.