Effect of canopy thickness and canopy saturation on the amount and kinetic energy of throughfall: An experimental approach
Effect of canopy thickness and canopy saturation on the amount and kinetic energy of throughfall: An experimental approach
复制标题
DOI：
10.1029/2007gl033010
复制
发表时间：
2008-03
影响因子：
5.2
通讯作者：
K. Nanko;Y. Onda;Akane Ito;H. Moriwaki
中科院分区：
文献类型：
--
作者：
K. Nanko;Y. Onda;Akane Ito;H. Moriwaki
为了研究冠层厚度和冠层饱和度如何影响穿透雨的量和动能，我们使用9.8 m高的移植日本柏树（Chamaaparis obtusa）和16 m高的喷雾喷嘴的大型降雨模拟器进行了室内实验。穿透雨的量和雨滴的大小和速度进行了测量，在24个点下的四个冠层结构所产生的分期分支修剪。林冠厚度的减小导致初始穿透雨量、大穿透雨雨滴体积比例、高速度雨滴数量和穿透雨动能的增加。与饱和林冠相比，湿润林冠的穿透雨量和大滴体积比例较低，但平均滴速较高。冠层厚度通过影响冠层饱和度和冠层内雨滴生成过程来影响穿透雨的生成。
To investigate how canopy thickness and canopy saturation affect the amount and kinetic energy of throughfall, we conducted indoor experiments using a 9.8‐m‐tall transplanted Japanese cypress (Chamaecyparis obtusa) and a large‐scale rainfall simulator with spray nozzles at a height of 16 m. The amount of throughfall and raindrop sizes and velocities were measured at twenty‐four points under four canopy structures generated by staged branch pruning. Decreasing the canopy thickness resulted in increases of the initial throughfall amount, volume proportion of large throughfall drops, the number of drops with high velocities, and throughfall kinetic energy. Compared to a saturated canopy, a canopy undergoing wetting had lower throughfall amounts and volume proportion of large drops, but higher mean drop velocity. Canopy thickness affected throughfall generation by affecting the processes of canopy saturation and drop generation within the canopy.