潜水蒸发负值现象研究

Study on negative value phenomenon of phreatic evaporation

潜水蒸发试验是研究潜水蒸发变化规律的主要手段,在潜水蒸发实验过程中,潜水蒸发时常出现负值,由于仪器精度的不断提高,潜水蒸发出现负值的现象更加明显,这类问题在其他实验站也时常出现,但一直没有合理的解释。文章通过对台安径流实验站30年的潜水蒸发资料进行分析研究,发现潜水蒸发出现负值现象与气压、气温的变化有密切联系及潜水蒸发出现负值所必须具备的条件。

The phreatic evaporation test is the main means for researching the change rule of phreatic evaporation.In the process of phreatic evaporation experiment, the negative value appears frequently for phreatic evaporation.Because of the continuous improvement of the instrument accuracy, the negative value phenomenon is more obvious.The paper analyzes and researches the phreatic evaporation data in 30 years for the Taian runoff experimental station,finds out the negative value phenomenon of the phreatic evaporation have the close relation with the change of the temperature and air pressure and determines the necessary conditions for the phenomenon.