论文部分内容阅读
为解决城市沥涝问题,以二维非恒定流方程为基本控制方程,按照水量平衡法改进的有限体积法思想,结合城市复杂的汇流特点,提出了一种分区分层的计算模式,构建了二维城市暴雨沥涝数学模型,包含了社区汇流、路网汇流、管网汇流和河道汇流4个计算模块。以天津市示范区段为研究对象,依次模拟了2009—2015年10次降雨过程,分析对比了验证点积水水位和湘江道的津河液位。模拟结果显示,河道液位模拟值与实测值变化趋势基本一致,两者平均值之间的误差均<10 cm,表明了模型具有一定的计算精度,可用于城市内涝监测预报,同时也为城市暴雨沥涝数学模型研究提供了新的方法和思路。
In order to solve the problem of urban waterlogging, a two-dimensional unsteady flow equation is taken as the basic control equation. According to the idea of finite volume method improved by water balance method and the complicated urban confluence characteristics, a hierarchical and hierarchical calculation mode is proposed. Two-dimensional urban rainfall storm waterlogging mathematical model, including the community convergence, road network convergence, network convergence and river convergence 4 calculation modules. Taking the demonstration section of Tianjin City as the research object, 10 rainfall processes from 2009 to 2015 were simulated in turn, and the water level of verification points and the Jin River level in Xiangjiang River were analyzed and compared. The simulation results show that the trend of simulated value of river level is basically the same with the measured value, and the error between the two mean values is less than 10 cm, indicating that the model has certain accuracy and can be used for monitoring and forecasting waterlogging in cities. Rain storm flood waterlogging mathematical model provides a new way of thinking and ideas.