区域动态气象干旱强度指数及其应用

基于综合气象干旱指数的基本原理,以气象干旱等级为基础构建区域动态气象干旱强度指数,并就其在监测评估业务上的应用进行分析研究。结果表明:区域动态气象干旱强度指数实现了对干旱强度的实时动态监测和评价,充分考虑了干旱的累积效应,不以人为划定时段来评价干旱强度,具有动态性、连续性和客观性的特点,可广泛应用于区域干旱的实时监测、灾害预警、过程评价、历史排位判断、重现期分析等业务。通过对2009/2010年云南秋冬春特大干旱中的应用检验,效果优于气象干旱指数。

Regional Dynamic Index of Meteorological Drought Intensity and Its Application

Based on the compound index（CI） for meteorological droughts,using the Regional Dynamic Index（RDI） for meteorological droughts constructed from the classification of droughts,the application of RDI in the operational service is analyzed.Results indicate that the occurrence and development of droughts can be monitored and evaluated dynamically by using RDI.The index responds to the cumulative effects of droughts sufficiently,with the intensity evaluation of a drought not depended on the time period defined artificially.With characteristics of dynamic,consecutive and exercisable,the index is more applicable in depicting regional droughts in service practice,such as real-time monitoring,disaster warning,course evaluating,return period estimation,history rank judgment and so on.The application test of RDI to the 2009/2010 extreme drought event occurred in Yunnan Province indicates that the practical effect is better than that by using the classification of drought.