最优插值校准法定量估测降水及效果分析

天气雷达可以监测大范围降水以及降水分布情况，但是由于雷达估测的是离地面某一高度处的降水，会造成降水估算的误差。地面雨量站测量的是地面上某个点累计的雨量，单点精度较高，但往往漏掉强降水，暴雨中心。结合两者的优点，研究了雷达和雨量计联合估测降水方法中的最优插值校准法，并和Z—I关系估测的降水结果进行了对比分析。在此基础上还比较了不同雷达初值场对降水精度的影响。结果表明，最优插值校准法定量估测降水可以提高雷达估算降水的精度，同时雷达初值场的代表性好坏直接关系到降水估测的效果。

Estimation of the Regional Precipitation With the Optimal Interpolation Calibration Method and Its Effectiveness Analysis

Weather radar can monitor rainfall and the distribution of precipitation. The precipitation rate on a certain height is estimated by radar, but will cause the error of precipitation estimation. This paper researches the optimal interpolation calibration method, which combines the advantages of radar and rainfall gauge. The paper compares the precision of the optimal interpolation calibration method with Z - I relationship method. On this basis, this paper also compares the results of rainfall estimation with different initial field. The results shows that Z - I relationship is worse than the optimal interpolation calibration method, especially when the precipitation was stable the better the initial field of the radar, the higher the estimation accuracy.