摘要
本文介绍采用彭曼(H.L.Penman)公式计算蒸发力的方法及应用和推导.该公式物理意义明确,有较严密的理论依据.它是以能量平衡和空气动力学原理为基础的多因子公式.用它计算的水面最大可能蒸发量乘以一定系数,便可换算成农田蒸散量.它是一个建立在生物学和物理学理论基础上,综合地考虑各影响因子的方法.应用时需结合当地情况予以修正.
Here is discribed how to calculate evaporation capacity according to H.L. Penman's formula. The formula is based on energy balance and the principles of air dynamics, including many parameters each of which has special physical definition. The amount of evapotranspiration of farm land can be calculated by multiplying the largest possible evaporation capacity of water surface with a special coefficient.Therefore this method is also based on biology and physics and it takes many different factors into account.But, the formula is not perfect and it must be calibrated with actual conditions before it is applied into use.The excellent results were gotten by applying H.L.Penman's formula in different regions of China.
出处
《山东农业科学》
1989年第6期22-24,共3页
Shandong Agricultural Sciences
关键词
农田蒸发量
蒸发务
彭曼公式
evaporation capacity
energy balance
air dynamics
drying power
evapotranspiration of farm land
