Research on Relationship Between Highway Traffic Blocking Induced by Waterlogging and Precipitation
Based on the 2011-2013 official records of nationwide highway traffic blocking induced by surface water, this study analyzes the spatiotemporal characteristics of highway traffic blocking induced by waterlogging, and investigates the correlation between highway waterlogging and precipitation in different durations. From the aspect of time, the yearly blocking is mainly recorded from May to September, especially in July; the daily blocking mainly occurs in 07:00-14:00, and next in 16:00-20:00. The highway waterlogging blocking is highly related to the precipitation in the latest 24 h, and the correlation between the highway traffic blocking by waterbogging and rainfall with different intensities varies among the regions. The correlation between the precipitation factor after dealing with cube root and the frequency of highway traffic blocking by waterlogging accords with the Gaussian distribution. From the aspect of space, the concerned blocking in Region 1 is closely related to hourly maximum precipitation factor with correlation coefficient over 0.91; the ones in Region 2 and Region 3 are closely related to 6 h maximum precipitation factor with correlation coefficient over 0.8; and the ones in Region 4 are closely related to 24 h maximum precipitation factor with correlation coefficient about 0.75. However, no matter in which region the highway traffic blocking induced by waterlogging occurs, the characteristics of precipitation are greatly different, so we can only estimate the risk probability of highway traffic blocking induced by waterlogging from the specific precipitation forecast.