Abstract:Based on 77 rainfall processes in Shijiazhuang from 2006 to 2008, this paper analyzes how quantitative precipitation estimation (QPE) is influenced by the altitude and horizontal distance from radar stations. Meanwhile, the optimum height of reflectivity factor for radar QPE and the values of distance and height corrections are suggested. The effect of QPE using the empirical formula and the optimization method are contrasted with and without distance and height corrections in four situations, and a QPE optimum scheme is designed according to the comparison results. No correction but only optimization method is adopted when the reflectivity is less than 30 dBz. Otherwise, distance and height corrections are performed firstly, and then optimization method is used in QPE. The results show that the proposed scheme has a good effect on heavy precipitation exceeding 10 mm·h-1 at single station, and on the process rainfall as well as on the estimation of regional precipitation.