利用湖南省86个地面气象台站1960-2005年的月降水资料(在Arcgis中通过Kriging插值方法对少数站点的缺测值进行了插补)分析了湖南省降水的空间分布特征;采用线性回归方法研究了湖南省降水的变化趋势及区域上的差异。结果表明:(1)湖南省降水的空间分布总体趋势是:西南东三面山地降水多,中部丘陵区和北部洞庭湖平原区降水少。(2)湖南省46年来年降水呈增加的趋势,但7年滑动平均曲线表明今后湖南省降水有减少趋势。湖南省西北部为降水减少区.其它区域均表现为增加。(3)湖南省春秋两季降水呈减少趋势。春季南岭和湘东南山地、秋季湘东北为降水增加区.其它地区为降水减少区。夏冬两季降水呈显著增加的趋势。夏季除攸县、临武和江华等少数站点外其它区域均表现为增加:冬季湖南省86个站点的降水均表现为增加。
The regional characteristics, trend of precipitation and regional difference of precipitation in Hunan Province were analyzed based on the monthly rainfall data of 86 meteorological stations from 1960 to 2005. The missing data was interpolated by using kriging interpolation in the Arcgis. The results show: (1)The annual precipitation spatial distribution is that the precipitation in mountainous areas is abundant, but the precipitation in plain is deficient.(2)The annual precipitation is increasing by 21.8mm/ 10a, but it will be reducing through 7 year running mean curve. The annual precipitation is increasing in almost the whole province.(3)Precipitation in spring and autumn is decreasing in most areas, and the precipitation of summer has an increasing trend. The precipitation in winter is increasing at all the 86 meteorological stations.