沙柳沙障防风阻沙效益的研究

以库布齐沙漠穿沙公路和神东矿区巴图塔沙柳基地为试验区,对沙柳沙障体系内外风速和输沙量进行了野外观测,根据调查和观测资料,利用surfer(8.0)软件作出沙障体系内外的风速流场图,并运用粗糙度(z0)、摩阻速度(u*)等物理参数,对复式沙柳沙障的防风效益和阻沙作用进行了系统研究。结果表明:半隐蔽式、平铺式沙柳沙障防沙体系内外,风速比(V2 m/V0.3 m)的变化随着向沙障体系的逐渐靠近呈非线性增大;粗糙度(z0)的变化则随风速比(V2 m/V0.3 m)的增大表现出两种情况:当旷野风速小于起沙风速时,其趋势线方程为多项式函数,当旷野风速大于起沙风速时,其趋势线方程为指数函数;在沙柳沙障防沙体系内外,由于沙颗粒与沙柳体系内沙柳发生碰撞,输沙率随防沙体系远近的分布不再简单遵循对数或者指数关系,其极值出现的距离随风速的增加而波动,由于沙柳沙障构成的下垫面复杂多变,其对风沙流结构与风沙活动层风速廓线的影响很难确定。

Effect of Salix Deserts Barrier on Reducing Wind and Stabilizing Sand

This paper observes salix deserts barrier along the highway of crossing Kubuqi desert and Batuta salix datebase.Then,according to the observation,make use of the software of Sufer(8.8) for the wind speed flow chart and it systematically analyses the benefit of wind-breaking and sand-binding of salix deserts barrier with roughness length and roughed wind speed.Besides,the research explains the effects of salix deserts barrier for the highway of crossing Kubuqi desert.The result expresses that the half concealment type,even spread type sand salix defend the sand inside the system,wind velocity ratio(V2 m/V0.3 m) of variety along with to salix system of gradual close to curve large;The variety of rough(z0) then compares along with the wind velocity(V2 m/V0.3 m)of the aggrandizement express two kinds of circumstances: When the weald wind velocity is small in rise sand wind velocity,its trend line is a polynomial function,being weald wind velocity is strong while rising sand wind velocity,its trend line is index number function;Defend the sand inside the system at the sand salix,because of sand grain and sand salix takes place collision inside system,sand rate with defend sand system to distribute far and nearly to no longer follow logarithms in brief or is an index number relation,it pole the value appear of distance with increment but motion of wind velocity,because of sand the salix constitute of earth's surface complications to change much,it flows structure and the sandstorm movable layer wind velocity influence of the line to the sandstorm very difficult assurance.