豫北地区蒸发能力及其变化趋势分析

根据典型观测站实测资料系列,分析了豫北地区近四十年来降水量和蒸发能力(水面蒸发量)的变化趋势;并利用相关分析技术,分析了蒸发能力(水面蒸发量)与风速、温度、湿度、日照等之间的相关关系。分析结果表明,豫北地区近四十年来蒸发能力呈现持续下降的态势,影响山丘区蒸发能力的主要因素为日照、降水量和湿度、风速,而影响平原区蒸发能力的主要因素为风速、湿度和日照、温度。这一重要的科学发现,不仅澄清了以前的一些模糊认识,而且对于重新核定更科学的灌溉定额和制定更合理的灌溉制度具有重要的参考价值。

Analysis of evaporation and its changing tendency in the North area of Henan Province

According to measured data, nearly 40 years precipitation and evaporation changing tendency in the North area of Henan Province are analyzed. Interrelated analysis technique is used to analyze the relation of evaporation (water surface evaporation), wind velocity, temperature, humidity and sunshine. It was shown that the main factors affected evaporation in hill are sunshine, precipitation, humidity and wind velocity while in plain are wind velocity, humidity, sunshine and temperature. This important finding will be valuable to making irrigation quota and irrigation system.