Abstract:The prevention of rainstorm disaster is very significant to the security of social economy, ecological environment and human life. Based on the PWV obtained from the Hunan ground-based CORS network (72 stations), along with the atmospheric thermodynamic conditions (temperature and pressure), this study analyzes the time series and plane dynamic variation of PWV before and after a rainstorm occurring April 3-4, 2015, in northern Hunan province. Some regular patterns of change characteristics of water vapor field are summarized. The results show that higher PWV values, which indicate a high probability of a storm, is a necessary condition for rain. Second, when PWV has reached 48 mm, it will be very likely to rain within an hour after the PWV begins to descend. Third, the intensity and duration of precipitation is determined by the peak value (50 mm) and dropping rate (increment) of PWV. Fourth, the variation range of PWV and the atmospheric thermodynamic conditions will determine the hourly precipitation density to a large degree. Lastly, the plane dynamic variation of PWV can accurately predict the actual falling zone of future precipitation.
LI Li,JIANG Ting,TIAN Ying et al. Analyzing Temporal-Spatial Variation of Water Vapor Field for a Local Rainstorm in Northern Hunan Province Using CORS Network[J]. jgg, 2017, 37(8): 835-840.