用变分方法校准数字化天气雷达测定区域降水量基本原理和精度

Principle and Accuracy of Adjusting the Area Precipitation from Digital Weather Radar through Variational Method

本文用变分方法校准雷达估算的降水强度和区域降水量,结果表明:经变分校准后,不但能使雷达探测到的结果与雨量计观测到的结果比较接近,而且还能保留没有雨量计站的地方雷达探测到的降水强度变化,其平均相对误差约为20％.

This article deals with a variational method through which the rainfall intensity and the area precipitation detected by a weather radar are adjusted. The result shows that not only the radar measurement agrees with the measurement of rain gauges but also the radar-detected rainfall distribution pattern between the rainfall stations can be retained after the adjustment. The absolute value of the relative errors is on average about 20%.