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投稿时间：2008-10-17 修订日期：2009-10-22
投稿时间：2008-10-17 修订日期：2009-10-22
中文摘要: 利用安徽江淮分水岭地区的合肥、六安、巢湖3个代表站1957—2008年汛期5—9月降水量资料，计算成相应的Z指数，在用Z指数作为旱涝分级指标过程中，发现Z指数理论界限值并不符合江淮分水岭地区的实际情况，因此必须对此进行修改和订正。以微调和旱涝年份数量大体对等为原则进行修正，修正后的7级和5级Z指数界限值较好地反映出江淮分水岭地区实际旱涝，因此修正后的Z指数可以应用到安徽江淮分水岭地区汛期旱涝等级划分中。
中文关键词: 汛期旱涝， Z指数， 指数修正， 江淮分水岭
Abstract:With the flood season precipitation data at 3 sampling meteorological stations in Jianghuai Watershed area of Anhui Province from 1957 to 2008, the Z-index method was applied to judge the flood/drought grades in Jianghuai Watershed area, and it is found that the theoretical Z-index is not suited to Jianghuai Watershed area. In this case the
theoretical boundary of Z-index should be adjusted, and there are two principles of adjustment: the first is slightly adjustment, and the second is that years of drought and flood are nearly equal. The new boundaries of Z-index for the grades of flood/drought are more suitable for the Jianghuai Watershed area. Therefore the modified Z-index can be well applied to Jianghuai Watershed area.
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基金项目:合肥市2007年度重点科研项目“基于SVD的合肥地区汛期旱涝气候预测研究应用”资助
引用文本：
方茸,周后福,屈雅,2010.基于江淮分水岭地区的Z指数修正[J].气象,36(10):110-113.
FANG Rong,ZHOU Houfu,QU Ya,2010.Adjustment of Z-Index Based on Jianghuai Watershed Area[J].Meteor Mon,36(10):110-113.
方茸,周后福,屈雅,2010.基于江淮分水岭地区的Z指数修正[J].气象,36(10):110-113.
FANG Rong,ZHOU Houfu,QU Ya,2010.Adjustment of Z-Index Based on Jianghuai Watershed Area[J].Meteor Mon,36(10):110-113.