Research on Dynamic Quantitative Precipitation Estimation Method Based on Tile Partitioning for Radar
Considering the spatiotemporal variability of raindrop spectra is an effective way to improve radar quantitative precipitation estimation(QPE).When using radar to estimate precipitation,the difference of rain-drop spectrum is mainly manifested by the formulas of Z-R relation.Using the method of tile partitioning QPE(QPE_TP),the precipitation estimation area is divided into tile partitions,the Z-R relationship is dynamically fitted using radar and automatic station data to carry out QPE within each tile.The QPE_TP effect was evaluated by utilizing six weather cases.From the evaluation indexes of QPE,the capability of QPE is significantly im-proved compared with the traditional fixed Z-R relationship and the global dynamic Z-R relationship.The QPE results are basically consistent with the heavy precipitation center,and the bias evaluation indexes are the least.The results show that the QPE TP method is an effective way to improve radar QPE.
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