Efficient simulation of urban flood inundation based on Taihu Lake basin model

The effective simulation of urban flood inundation is crucial for mitigating the effects of flooding and devising disaster prevention and mitigation measures. In this study, an efficient simulation method based on grate-inlet linking overland and pipe flow was proposed for the whole process of urban rainfall-runoff-flood inundation. On the basis of monitoring data from the Shuangqiaobang urban runoff and flood inundation experimental site, urban flood inundation models based on an efficient simulation algorithm and a two-dimensional hydrodynamic algorithm were calibrated and validated. The accuracy and reliability of the two methods were analyzed and compared in different rainfall events. The results show that the efficient simulation method based on the grate-inlet urban hydrological feature unit in the Taihu Lake basin model could reflect the specific characteristics of urban flooding more accurately. The computational efficiency is approximately 780-1 275 times than that of the two-dimensional hydrodynamic algorithm. Overall, it can simulate urban flooding with the same settings much more quickly.