水土保持研究2017，Vol.24Issue(5)：157-161,5.
黄河乌兰布和沙漠段沿岸不同高度典型沙丘风沙特征
Wind Velocity and Sand Flow Transport Characteristics of Different Height Typical Dunes in Ulan Buh Desert Along the Yellow River
摘要
Abstract
Flow fields of wind speed and aeolian transport are concerned by scientists because of its basic position in desert research.We took 3 typical dunes with different heights as samples and measured flow fields of wind,wind profiles,velocity accelerations,sediment discharges of 5 heights of different parts.Results show that:(1) wind velocity is greater over the top of dune but lowest at central leeward and appeares to increase firstly and decrease later and increase eventually from dune windward slope foot to leeward slope foot,showing the tendency of ‘S' shape;(2) vertical changes of wind at different parts of dune and height changes of logarithmic follows the linear regression equation [V=aln(z)+b],slope of wind profile increases gradually from top of dune to slope foot of windward and leeward,friction velocity and roughness changes appear inconsistently;(3) wind velocity acceleration of low-rise (20 cm) is higher than high-rice;dune development scale impacts wind velocity acceleration of windward obviously,and feedback is significant with its growth;(4) sediment discharges of different dune parts within 0～ 100 cm show a uneven law of diminishing power function and concentrate in 0～10 cm,and distribute in 0～4 cm mostly.Relative sediment discharges are stable and do not transform with height changes.关键词
风速流场/风速廓线/风沙流/乌兰布和沙漠Key words
wind velocity flow field/sand flow/wind profile/Ulan Buh Desert分类
天文与地球科学引用本文复制引用
尹瑞平,郭建英,董智,何京丽,李锦荣,田世民,代豫杰..黄河乌兰布和沙漠段沿岸不同高度典型沙丘风沙特征[J].水土保持研究,2017,24(5):157-161,5.基金项目
水利部公益性行业科研专项经费(201401084) （201401084）
国家自然科学基金(41301303,51409114) （41301303,51409114）
中国水利水电科学研究院科研专项(MK2016J03) （MK2016J03）
