Spatial and Temporal Characteristics of Drought/Flood in Linyi Based on Standard Precipitation Index (SPI) in Recent 51 Years
Based on the monthly precipitation data in Linyi during 1961-2011 and the standard precipitation index,the spatial-temporal characteristics of drought/flood in Linyi were analyzed.The results indicated that the flood was more severe in the early 1960s and 1970s,and drought was more frequent in the late 1960s,the 1970s and in the whole 1980s,drought and flood manifested alternately from the 1990s to the early 21 st century.Occurence of drought in spring and winter tended to decrease weakly,while in autumn tended to be more severe,there was no obvious change in summer.There was a relative consistence in variation of flood/drought in the northern mountains' region,western hills' region and southern plains,but the change range of drought/flood in western hills was lager than that in other two regions in the middle 1960s,the middle 1980s and the early 21st century.The most drastic drought/flood variability occurred in the early 21st century,and in the late 1970s,the variability was minimum.The variability in three regions was consistent with that the whole city in the mass,but in southern plains the variability of flood/drought increased since 2004.
standard precipitation index (SPI)drought/floodspatial-temporal characteristicsLinyi
NETL
NSTL
万方数据
