黄河内蒙古段干流水面蒸发量变化特征

Analysis of Water Evaporation of Inner Mongolia Section of the Yellow River

采用气象趋势系数和气候倾向率方法,分析了黄河内蒙古段河道形心点处E601蒸发皿蒸发量的变化特征,并计算了近55 a黄河内蒙古段水面蒸发量。结果表明:黄河内蒙古段年、季水面蒸发量均呈减小的趋势;多年平均水面蒸发量为3.27亿m3,其中春、夏两季的蒸发量在全年蒸发量中占主导地位;水面蒸发量的变化趋势是由气象因子综合作用所致,并不随着气温的升高而增大。

The variation of E601 pan evaporation on central point of the Yellow River in Inner Mongolia was analyzed by using the method of climate tendency coefficient and climatic trend rate, and water surface evaporation of the Yellow River in Inner Mongolia section for nearly 55 years was also calculated. The results show that the average annual and seasonal evaporation are declined. The average annual evaporation of the Yellow River is about 32.7 billion m3 , however the annual evaporation is dominated in spring and summer. The meteorological elements have different performance in water surface evaporation of different regions. The conclusion that with the temperature rising the evaporation is increasing is not correct.