城市雨水口地面暴雨径流模型研究

A Study on the Model of Surface Storm-Water Runoff at Urban Gully

在假设每一雨水口集水流域产生的地面暴雨径流均汇入该雨水口的条件下,建立了由流量子模型和浓度子模型组成的城市雨水口地面暴雨径流模型。其中,流量子模型采用瞬时暴雨强度描述降雨过程、区域综合径流系数计算扣损以描述产流过程、等流时线原理描述汇流过程;浓度子模型则反映了雨水口入流污染物浓度仅随入流流量而变化。以重庆市两个具有代表性的雨水口为例,确定模型的具体形式,并采用2000年7～9月间的水量、水质同步测量数据,对模型的模拟精度进行验证。

On the assumption that the runoff on the catchment of each gully flows into the gully itself, in this paper, a model of surface storm-water runoff at urban gully is presented, which includes runoff sub-model and concentration sub-model.The runoff sub-model describes the rainfall event with instantaneous rainfall intensity, the runoff-generated event with runoff coefficient of integrative area and the runoff converged event with the principle of equal time of flowage.The concentration sub-model shows that the pollutant concentration event only changes with the runoff event at the gully.In this paper, the concrete form of the model for two gully inlets in Shapingba District of Chongqing is given.The model is calibrated with the data from the synchronized measurements of water quantity and quality at the two gully inlets obtained from July to September 2000.The relative error is calculated by comparing the model predictions with the field-measured results.