摘要
运用最优化方法,选取北京市新一代天气雷达2007年5场降雨的基数据资料与对应的地面雨量计资料进行Z-R关系研究,对比由雨量计观测值和雷达估测值插值得到的面雨量分布情况。结果表明:采用缺省的Z-R关系估算出的区域面雨量普遍偏小很多,优化后雷达估测的雨强分布与雨量站点测量的雨强分布更接近,且雷达定量估测区域面雨量的精度有了较大提高。
The power relationship of Z-R in the city of Beijing is verified by applying an optimization approach, using the data sets of five independent rainfall events in 2007 obtained from both NEXRAD and rain gauges. Each data set contains daily gauge measurements at 122 stations and corresponding reflectivity data of NEXRAD with 6-minute resolution. The distribution of areal rainfall is evaluated by the optimal Z-R relationship and compared to that by the data of rain gauges. It shows that the optimal Z-R relationship exhibits a significant improvement on the precision of estimation and better approximation to the precipitation observed by rain gauges. In addition, rain estimations of sheet cloud rainfall events are superior to those of convective cloud rainfall events while the results within the areas closer to the radar station are more accurate than those farther away from the station.
出处
《广东水利电力职业技术学院学报》
2011年第4期1-7,共7页
Journal of Guangdong Polytechnic of Water Resources and Electric Engineering
基金
水沙科学与水利水电工程国家重点实验室统筹课题(2009-TC-1)
国家自然科学基金项目(50679031)
