作　　者： ; ; ; ;

机构地区： 中山大学地理科学与规划学院水资源与环境系

出　　处： 《热带地理》 2008年第4期306-310,共5页

摘　　要： 分析了东江流域1961-2003年蒸发皿蒸发量及其影响因子的趋势变化和突变变化,结果表明:东江流域年蒸发量减少趋势显著,一年中,春季、前汛期、后汛期的蒸发量减少趋势显著,秋季蒸发量减少,但不显著;年蒸发量的突变发生在1981年;秋香江口以下和东江三角洲的年蒸发量减少趋势显著,秋香江口以上有增加趋势,但不显著;全年和各季的蒸发皿蒸发量与日照时数、温度、风速的偏相关系数为正,与相对湿度的为负;日照时数、风速显著减少,突变分别发生在1981年和1982年;气温显著增加,突变发生在1987年;相对湿度显著减少,突变发生在1986年;蒸发皿蒸发量出现减少趋势的原因主要是日照时数的减少,其次是风速减小。 The trend change and abrupt change of the pan evaporation and their influencing climate factors over the Dongjiang basin from 1961 to 2003 are analyzed. The results show that significant decreasing trends of the annual pan evaporation are detected; the trend of the pan evaporation decrease in spring, pre-flood season and post-flood season was obvious in a year, but not evident in the period from October to December. The abrupt change of the pan annual evaporation occurred in 1981. The annual pan evaporation in the areas south of the Qiuxiang River mouth and in the Dongjiang River delta was decreasing obviously, while that in the area north of the Qiuxiang River mouth was increasing, less obviously. The pan evaporation in a year and different seasons had a positive correlation to average temperature, sunshine humidity. The annual sunshine duration and the annual duration and wind speed, and a negative correlation to average wind speed deceased obviously, and the abrupt change occurred in 1981 and 1982. The annual average temperature showed significant increasing trend, and the abrupt change in 1987. The annual average relative humidity showed significant decreasing trend, and the abrupt change in 1986. The major reason of pan evaporation decrease was the decrease of sunshine duration, and the second was the decrease of wind speed.

关 键 词： 蒸发皿蒸发量 影响因子 变化特征 东江流域

领　　域： [天文地球] [水利工程] [天文地球]