人工模拟降雨的能量相似及其实现  

Principle and method to simulate rainfall with the similar kinetic energy

作　　者：薛燕妮[1] 徐向舟[1] 王冉冉[1] 程飞[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116024

出　　处：《中国水土保持科学》2007年第6期102-105,112,共5页Science of Soil and Water Conservation

基　　金：黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(10501-175);"十一五"国家科技支撑计划重点项目课题(2006BAB14B05)

摘　　要：能量相似是降雨模拟的基本原则。通过对雨滴粒径、雨滴击溅速度、降雨均匀度等能量相似要素的分析和探讨,提出实现降雨模拟能量相似的重要手段,即在降雨高度、雨滴发生器等条件不变的情况下,通过调节雨强来实现降雨能量的相似;通过加大供水压力等手段可提高降雨动能,所以在降雨模拟实践中,降雨高度不一定需要达到使所有粒径的雨滴均达到终速所需的高度。It is important to offer the kinetic energy equal to that of the natural rainfall in the rainfall simulation. This study analyzes the elements of the rainfall energy including the raindrop diameter, the raindrop impact velocity, and the uniformity of rainfall distribution, and then presents a method to realize the energy similarity by adjusting the rainfall intensity. Nevertheless, the raindrops from pressurised rainfall simulators could attain the terminal velocity over short fall distances less than 10 m if the pressure of the supplied water were high enough.

关 键 词：降雨模拟 能量相似 降雨高度 降雨强度 

分 类 号：S157.1[农业科学—土壤学]