Abstract
Forest canopy can divide raindrops to minute water droplets by collisions with branches and leaves. This may promote evaporation and suspension of water and influence the water budget in forest area. Therefore, we investigated the size distribution of minute water droplets caused by the collisions. Experimental results showed that the size distribution of droplets could be represented by N=N0exp (-ar3-br2), where N, r: number and radius of droplet, and No, a, b: constants, better than by exponential equation especially in both ends of distribution curve. Estimated evaporation during 20m fall of minute droplets was about 1-3%.
