天气雷达定量降水估测不同校准方法的比较与应用

利用天气雷达联合地面雨量计定量降水估测的局地平均校准法和局地分级平均校准法,分布估计2012年7月21日20:00至22日01:00 BT重庆市荣昌县及附近的降水。结果表明,局地分级平均校准法较局地平均校准法对强降水的估测效果好,同时两种方法的降水估测效果均与所取的局地校准半径大小有关。对降水分布及洪水灾情的分析表明,降水分布与河网的结合是进行中小河流洪水气象风险预报的重要着眼点。

Comparison and Application of Different Adjustment Methods for Quantitative Precipitation Estimate by Weather Radar

Distribution estimates of hourly intense precipitation derived from radar and rain gauges by the local classified average bias adjusted and local average bias adjusted algorithms are examined for an extreme rainfall event that occurred in 21-22 July 2012 in Rongchang, Chongqing. The results show that the local classified average bias adjusted algorithm is better in estimating hourly intense rainfall than the local average bias adjusted algorithm. The accuracy of rainfall estimation is related to the local adjusted radius. The analyses of rainfall distribution and disaster situation show that the combination of intense rainfall distribution and river networks is significant for meteorological flood risk forecast of intermediate rivers.