%A ZHANG Qiang;GAO Ge %T THE SPATIAL AND TEMPORAL FEATURES OF DROUGHT AND FLOOD DISASTERS IN THE PAST 50 YEARSAND MONITORING AND WARNING SERVICES IN CHINA %0 Journal Article %D 2004 %J Science & Technology Review %R %P 21-24 %V 22 %N 0407 %U {http://www.kjdb.org/CN/abstract/article_1442.shtml} %8 2004-07-10 %X In the context of statistic data of drought and flood disasters in the past 50 years, the spatial and temporal features of drought and flood disasters and their changing tendencies were analyzed. The result shows in the past 50 years , particularly starting from 1980s. the precipitation has been increasing in the east of China while the precipitation has been decreasing in the north of China. When the frequency of drought increased, the flood also increased. The crop areas stricken and affected by drought and flood increased clearly and economic losses became huger and huger. In order to prevent and mitigate disasters and provide timely drought and flood monitoring information to government and users, National Climate Center has been developing the daily drought and flood monitoring and warning system since 1995.The operational system has set up the drought monitoring and warning index, based on the meteorological observation data from 600 stations in China and forecast data with 7 days in advance. Based on the index and the soil moisture observed by agricultural and meteorological stations and drought result from satellite remote sensing into account, the Monitoring Bulletin of Drought and Flood in China are released for relative departments of the government and the public.