摘要
通过对戈壁地表风沙流特性的风洞模拟实验,旨在探讨戈壁地表性质是如何影响气流的紊动性,并对风沙流的结构和风沙活动层内的风速廓线产生影响,从而对野外风沙工程的设计提供理论依据。实验发现:在戈壁地表风沙活动层主要集中在距地表20cm范围内;由于沙颗粒与戈壁地表的砾石发生碰撞,浓度分布不再简单的服从对数关系递减,其极值出现的高度随风速的增加而上移,呈现"象鼻效应";不同风速下风沙活动层内同一高度含沙颗粒浓度之间存在很好的相关性。
Through researching on simulation of drifting sand flux's characteristics over Gobi surface in the wind tunnel,the aim is to probe into how the characteristics of Gobi surface effected on the eddy of air current,moreover,on the structure of drifting sand flux and velocity profile in the layers of drifting sand activity.Therefore, it can provide a theoretic gist for the design of sand drifting engineering in the field.This experiment shows that the height of the layer of drifting sand activity is within 20 cm over surface,there is a good relativity between sand concentration and corresponding wind velocity and a distinctive impacting on the air current containing sand in this scope.
出处
《水土保持研究》
CSCD
北大核心
2005年第1期54-55,58,共3页
Research of Soil and Water Conservation
基金
国家重点基础研究发展规划(G1999043505)
国家科技攻关项目"十五"攻关(2002BA517A11)资助
关键词
戈壁
风沙流结构
风速廓线
Gobi
structure of drifting sand flux
wind velocity profile
