Abstract:

In order to understand the climatic characteristics of rainstorm and flood disaster in linyi county, the temporal and spatial distribution of heavy rainfall is identified on the basis of daily rainfall data from 1962 to 2009 collected on 10 weather stations in linyi county. The study results showed that: (1) heavy rainfall in linyi had a distinct feature of regional distribution. The amount of rainfall in southeast was much higher than northeast; (2) The variation of heavy rainfall in liyi was changing repeatedly from increasing to decreasing, the current stage had obvious growing trend; (3) Heavy rainfall in linyi had high frequencies in June to September, July was the month received highest rainfall. Storms usually happened in April to October, peaking on July. Most of heavy rain in linyi were local storm; (4) Most of heavy rain in linyi lasted for more than 12 hours. A greater chance of heavy rain was during the night; (5) 4 system, including Shear line, cyclone, cold front trough and typhoons controls linyi’s weather system. Cyclones shear line and typhoons were the two strongest systems; (6) Flood disaster in linyi had the characteristics of distributing widely, occurring frequently and varying significantly in different regions and seasons. It usually occured with little warning and could cause terrible damage to local economy. The results of research provided referceces of prediction on rainstorm, which can prevent the flood.