Crushed rock layers (CRLs), ventilation ducts (VDs) and thermosyphons are air-cooling structures (ACSs) widely used for maintaining the long-term stability of engineered infrastructures in permafrost environ-ments. These ACSs can effectively cool and maintain the permafrost subgrade's frozen state under climate warming by facilitating heat exchange with ambient air in cold seasons. As convection is a crucial work-ing mechanism of these ACSs, it is imperative to understand the near-surface wind flow (NSWF) across a constructed infrastructure, such as an embankment. This article describes a yearlong field observation of the NSWF across an experimental expressway embankment, the first of its kind on the Qinghai–Tibet Plateau (QTP). The wind speed and direction along a transect perpendicular to the embankment on both the windward and leeward sides and at four different heights above the ground surface were collected and analyzed. The results showed that the embankment has a considerable impact on the NSWF speed within a distance of up to ten times its height, and in the direction on the leeward side. A power law can well describe the speed profiles of NSWF across the embankment, with the power-law indices (PLIs) varying from 0.14 to 0.40. On an annual basis, the fitted NSWF PLI far away from the embankment was 0.19, which differs substantially from the values widely used in previous thermal performance evalu-ations of ACSs on the QTP. Finally, the significance of the NSWF to the thermal performance of the ACSs, particularly the CRLs and VDs, in linear transportation infrastructure is discussed. It is concluded that underestimating the PLI and neglecting wind direction variations may lead to unconservative designs of the ACSs. The results reported in this study can provide valuable guidance for infrastructure engineer-ing on the QTP and other similar permafrost regions.

Yanhu Mu;Wei Ma;Zhaohui(Joey) Yang;Xiaolin Li;Kun Zhang;Yuncheng Mao

State Key Laboratory of Frozen Ground Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,Chinac College of Engineering,University of Alaska Anchorage,Anchorage,AK 99508,USA;College of Civil Engineering and Architecture,Jiaxing University,Jiaxing 314001,China;School of Civil Engineering,Northwest Minzu University,Lanzhou 730024,China

工程（英文）

[1]Yanhu Mu;Wei Ma;Zhaohui(Joey) Yang;Xiaolin Li;Kun Zhang;Yuncheng Mao-.Field Observations of Near-Surface Wind Flow Across Expressway Embankment on the Qinghai–Tibet Plateau)[J].工程（英文）,2022(07):169-180

Embankment,CRLs,VDs,thermosyphons,NSWF,yearlong,expressway,PLIs,underestimating,unconservative

Field,Observations,Near,Surface,Wind,Flow,Across,Expressway,Qinghai,Tibet,Plateau,Crushed,rock,layers,ventilation,ducts,are,air,cooling,ACSs,widely,used,maintaining,term,stability,engineered,infrastructures,permafrost,environ,ments,These,effectively,subgrade,frozen,state,climate,warming,by,facilitating,heat,exchange,ambient,cold,seasons,convection,crucial,work,mechanism,these,imperative,understand,surface,flow,across,constructed,such,embankment,This,article,describes,field,observation,experimental,first,its,kind,QTP,speed,direction,along,transect,perpendicular,both,windward,leeward,sides,four,different,heights,above,ground,were,collected,analyzed,results,showed,that,has,considerable,impact,within,distance,up,ten,times,power,law,well,profiles,indices,varying,from,On,annual,basis,fitted,far,away,was,which,differs,substantially,values,previous,thermal,performance,evalu,Finally,significance,particularly,linear,transportation,discussed,It,concluded,neglecting,variations,may,lead,designs,reported,this,study,provide,valuable,guidance,other,similar,regions

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