气候变化领域集成服务门户(CCPortal): Bidirectional convection mechanism and cooling performance of road embankment with a new duct-ventilated slope in permafrost regions

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DOI	10.1016/j.coldregions.2021.103360
	Bidirectional convection mechanism and cooling performance of road embankment with a new duct-ventilated slope in permafrost regions
	Zhang, Zhenyu; Yu, Qihao; Wang, Junfeng; Wang, Xinbing; Luo, Xiaoxiao
通讯作者	Yu, QH (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	0165-232X
EISSN	1872-7441
卷号	191
英文摘要	Embankment with duct-ventilated slope (EDVS) is a new kind of proactive roadbed cooling measure in permafrost regions, which is composed of multiple hollow cement ventilation ducts assembled side by side, and the ducts are laid down on embankment slope. To investigate its cooling mechanism and performance, a prototype field test was carried out on the Qinghai-Tibet Plateau. The in-situ flow visualization test revealed that EDVS can conduct the convection process of airflow upward parallel to the embankment slope at the windward slope and downward parallel to the slope at the leeward slope. Thus, the bidirectional airflow in the ducts is available, which is termed as bidirectional convection mechanism and first discovered in embankment slope cooling measures. The numerical simulation results indicated that the wind pressure gradient is the primary reason for the bidirectional convection mechanism. The bidirectional convection mechanism can effectively utilize the low-temperature air to reduce the subgrade temperature in cold seasons. The monitored data showed that EDVS reduced the annual average slope temperature by 3.8 degrees C compared to the traditional no-covered embankment. EDVS provides new research for roadbed cooling measures in permafrost regions.
关键词	CRUSHED-ROCK REVETMENT NATURAL-CONVECTION RAILWAY EMBANKMENTS FLOW VISUALIZATION HEAT-TRANSFER SURFACE BOARDS
英文关键词	Embankment with duct-ventilated slope; Cooling mechanism; Cooling effect; Permafrost
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
WOS记录号	WOS:000691247200002
来源期刊	COLD REGIONS SCIENCE AND TECHNOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254143
作者单位	[Zhang, Zhenyu; Yu, Qihao; Wang, Junfeng; Wang, Xinbing; Luo, Xiaoxiao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Yu, Qihao] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Beiluhe Observat & Res Stn Frozen Soil Engn & Env, Lanzhou 730000, Peoples R China; [Zhang, Zhenyu; Luo, Xiaoxiao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhenyu,Yu, Qihao,Wang, Junfeng,et al. Bidirectional convection mechanism and cooling performance of road embankment with a new duct-ventilated slope in permafrost regions[J]. 中国科学院西北生态环境资源研究院,2021,191.
APA	Zhang, Zhenyu,Yu, Qihao,Wang, Junfeng,Wang, Xinbing,&Luo, Xiaoxiao.(2021).Bidirectional convection mechanism and cooling performance of road embankment with a new duct-ventilated slope in permafrost regions.COLD REGIONS SCIENCE AND TECHNOLOGY,191.
MLA	Zhang, Zhenyu,et al."Bidirectional convection mechanism and cooling performance of road embankment with a new duct-ventilated slope in permafrost regions".COLD REGIONS SCIENCE AND TECHNOLOGY 191(2021).