ABSTRACT
ABSTRACT: This study presents methodology and index for quantify assessment of drought-flood abrupt alternation phenomenon. Based on the precipitation data during flood season from 1956 to 2010 in Fuyang city, drought-flood abrupt alternation events during this period was assessed in using Drought-Flood Abrupt Alternation Severity Index (DFAASI). The drought-flood abrupt alternation events calculated by DFAASI were basically consistent with the historical statistics. The result shows that drought-flood abrupt alternation events in Fuyang city happened frequent. There are 11 times drought-flood abrupt alternation severe events happened from 1956 to 2010 in Fuyang city, respectively 1957, 1960, 1964, 1968, 1969, 1970, 1971, 1977, 1986, 1993 and 1997. The index can be used to calculate the regularity of drought-flood abrupt alternation events. The methodology obtained in this study is specifically intended to support local and national governmental agencies in water-related disaster management.
