基于融合降水产品的春季淮河流域干旱指数适用性分析

Feasibility Analysis of Drought Index of Huai River Basin in Spring Based on Fusion Precipitation Products

本文使用CMORPH地面卫星融合逐小时降水产品和2008—2012年淮河流域26个地面观测站春季降水资料计算降水量距平百分率(Pa指数)、Z指数和同期的验证指数,即标准化降水指数(standardized precipitation index,SPI)。结果表明,CMORPH地面融合逐小时降水产品月累积降水数据资料可靠,与实测数据的相关系数r为0.94,显著相关;通过修正的Z指数和Pa指数与SPI的相关系数r分别为0.74、0.75,满足相关性检验。表明基于CMORPH地面卫星融合逐小时降水产品的Pa指数和Z指数对淮河流域春季的干旱监测是有效的。

The precipitation anomaly percentage index(Pa index),Z index and same period validate index(standardized precipitation index,SPI)were calculated by using hourly precipitation and CMORPH fusion precipitation products,and precipitation data from 26 stations of Huai River basin in spring of 2008-2012.The results showed that the monthly precipitation data accumulated by CMORPH hourly precipitation fusion products was reliable,the linear correlation coefficient r was 0.94,and it was significantly related to Z index.The correlation coefficient r between modified drought classifications and SPI was 0.74(modified Z index)and 0.75(modified Pa index)respectively,which met requirement of correlation test.The correlation test showed that Pa index and Z index based on the hourly precipitation and CMORPH precipitation fusion products were valid.