Abstract:
Based on the climate data of Yueyang from 1989 to 2018, several types of major urban meteorological disasters affecting Yueyang were analyzed and the change law of disasters was obtained by combining with urban development information. As the increasing scale of cities and the increasing number of industrial enterprises in cities, urban meteorological disasters such as torrential floods, high temperature heat waves, gales, thunderstorms, fog and haze show obvious changes. Urban rainstorm had an oscillating period of 2-4 days, and the number of rainstorm days has decreased in the recent 10 years. However, the frequency of short-term heavy rainfall and the maximum precipitation in 24 hours are rising, and the maximum precipitation in 1 hour is larger.The annual thunderstorm days had a downward trend, and were lower than the average in the past 12 years. The decline rate was-31 d/10 a, but the intensity of thunderstorm increased, and the impact of disasters was obvious. The high temperature days varied greatly from year to year with an increasing trend, and the high temperature extreme value increased. The number of days of urban gale decreased, but the phenomenon of small-scale instantaneous gale increased. After 2005, the annual variation of urban fog was obvious, and the number of days of haze increased obviously.