贵州省遵义地区暴雨Z-I关系研究

Study on Z-I Relationship of Rainstorm in Zunyi Region of Guizhou Province

根据2007年32次暴雨天气过程中遵义新一代天气雷达提供的每6 min一次体扫回波资料和120 km扫描范围内9个地面观测站点相应时段的雨强资料,利用最小二乘法进行数据拟合,建立适合本地区暴雨过程的Z-I关系。选取2008年11次暴雨天气过程进行效果检验,并从多方面进行误差分析。结果表明,按强度范围划分建立的Z-I关系较WSR88D默认的Z-I关系(Z=300I1.4)更适合本地,准确率高。可为今后强降水过程的定量估测提供较好的判据,在暴雨灾害预警工作中发挥重要作用。

According to the echo intensity scan data per 6 min and 9 ground stations relevant rain intensity data of 120 km scan range supplied by the new weather radar of Zunyi during the 32 times rainstorm in 2007, the study used the least square method to fit the data and set up the Z-I relationship suited for Zunyi during the rainstorm process. 11 times rainstorm in 2008 were effectively tested and the error analysis made from different aspects. The result showed that the Z-I relationship based on the intensity area was more suitable and accurate for Zunyi region than the implicated WSR88D. The new Z-I relationship can provide the better criterion for the quantitative precipitation estimation of the rain- storm in the future, which can play an important role in rainstorm disaster warning.