Research Of Nanchang Precipitation Characteristics In The Process Of Urbanization

Climate change and urbanization are two influence factors making the human more vulnerable to disasters. Under the premise of the global climate warming causes space-time distribution of precipitation change, the uneven distribution of rainfall time of Nanchang city have a profound impact on the social and economic development of the city and the people’s life. By using the data information from statistical yearbook of jiangxi province and nanchang city, this paper analyzes the nanchang urbanization development level;And the paper using the daily rainfall data of two stations from Nanchang Weather bureau, selecting rainfall data from1951to2007of nanchang city, studies detailedly the multiple time scale features, Nanchang rain cycle changes, changes in different rainfall intensity and rainfall mutation characteristics,etc,using the trend analysis.moving average, wavelet analysis, Mann-Kendall mutation testing methods and analysis methods such as correlation analysis.And in the last, the paper through the comparative analysis of City and suburbs analyzes influence from nanchang city urbanization on rainfall characteristics, to explore the nanchang whether there is "rain island effect" and the contribution of urbanization to its. Paper the main research results are as follows:(1) Nanchang urbanization influence of rainfall in urban areas is more and more obvious, but the influence degree of the city of rain are still low. Urbanization does not make nanchang apparent "rain island effect". Nanchang is mainly affected by regional climate, rainfall urbanization is increasing the rainfall sequence fluctuation change in short period.(2) the nanchang showed a trend of slightly lower rainfall, rainfall trend rate is1.3mm/10years, but the urbanization makes more obvious uneven distribution of rainfall years, changes in rainfall frequency increases, the extreme precipitation and strong rainfall caused by increased urbanization.(3) In the future Nanchang Annual rainfall and four seasons rainfall will continuous less, and less rainfall is expected to continue until around2014.