Numerical Simulation and Risk Evaluation of Rainfall Water Logging in Liuzhou City
The water logging disasters caused by the different types of rain are simulated with the water logging simulation model. The risks caused by the wat e r logging are also primarily estimated. The results show that the water logging disasters are almost gradeⅠ or Ⅱ when the rainfall is below 100mm. When the rai nfall is above 100mm and 150mm the water logging disasters of grade Ⅲ reach 25% and 37%, res pectively. The absolute errors between water logging values and simulated values are within 20cm, but the absolute errors increase up with rainfall intensity. T he water logging disaster caused by the first heavy rain is more serious than the simulated result. But the case is quite the contrary that the heavy rain occurs after long and continuous fine weather, for example lasting 19 days. The above results can provide some references for expanding forecast and service field of urban disasters as well as risk estimation of water logging disaster.