摘要
利用合肥新一代天气雷达2003年6—7月观测数据和地面观测的逐时雨量资料,得到分段最优化Z-I关系,在淠河灌区的水源地响洪甸流域和佛子岭流域进行降水测量。结果表明:强降水阶段流域面雨量,优化Z-I关系后得到的流域累积面雨量与雨量计比值从39%提高到73%,同时相关系数从0.78提高到0.8。528小时时间序列上佛子岭流域在优化Z-I关系之后,流域平均面雨量与雨量计的回归线斜率从0.4提高到0.72,1mm·h-1以上流域平均面雨量累积值与雨量计累积值的比值从48.4%提高到了85.9%。可见,优化Z-I关系后雷达反演值更接近于雨量观测值,同时雷达定量估测流域面雨量的精度得到很大提高。
Based on the observation data of New Generation Weather Radar （CINRAD） and hourly surface rain gauge data, a subsection optimized Z-I relationship was obtained, the rainfall measurements were conducted in Xiang hongdian and Foziling subcatchments which located in the upper reaches of Pihe. The results show that by this optimized relationship, the ratio between the basin accumulated area rainfall and rain gauge value improved from 39 % to 73 % while the correlation coefficient from 0.78 to 0.8. On the 528 - hour time sequence of Foziling subcatchment with the optimized Z-I relationship, the trend line slope of mean area rainfall increased from 0.40 to 0.72 compared to rainfall from rain gauge, while the ratio between the accumulated area rainfall value above 1mm/h and the accumulated rain gauge value improved from 48.4% to 85.9%. Obviously, optimized Z-I radar rainfall value is closer to the observed rainfall value, and the precision of area rainfall by radar is strictly improved.
出处
《气象》
CSCD
北大核心
2007年第6期37-43,共7页
Meteorological Monthly
关键词
分段优化法
天气雷达
面雨量测量
subsection optimization technique weather radar area rainfall measurements
