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《Journal of Glaciolgy and Geocryology》 2002-02
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Influence of Solar Radiation on Embankment Surface Thermal Regime of the Qinghai-Xizang Railway

HU Ze-yong,\ QIAN Ze-yu,\ CHENG Guo-dong,\ WANG Jie-ming (Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences LanzhouGansu 730000, China)  
Under the assumption of no atmospheric influence on solar radiation transfer, the daily solar radiation amount on railway surface was calculated in one year cycle. Generally the discrepancy of daily solar radiation amount on bothroad-slopes was obviously and varied with season and railway direction. By using the dataset of GAME-Tibet IOP 98 in a fair day in Amdo of the Tibetan Plateau on July 16, 1998, the surface absorptionradiation and some radiation parameters on roadbedand road-slopes were presented. The results show that the daily variation of surface absorptionradiation on both road-slopes varied with railway direction. The discrepancy of surface absorptionradiation between both road-slopes appeared a multi-peak structure in one-day cycle. And the values of these peaksincreased while the railway direction changed from eastward to northward. The discrepancy of daily surface absorptionradiation amount between both road-slopes also varied with railway direction, higher on southeastward railway and lower on northeastward railway. So it is better to construct the railway on tundra region as northeastern direction to reduce the unsymmetrical effect of radiation heating on bothroad-slopes. Further more, the relationship between the railway thermal regime and surface absorptionradiation was linked to design a simple parameterization scheme to retrieve the ground surface temperature on roadbed and both road-slopes.The retrieved ground surface temperature basically agreed the observed one on roadbed. Even so, it is necessary to introduce other variables that affected the ground surface temperature, such as cloud amount, precipitation, air temperature and so on, to improve thisparameterization scheme.
【Fund】: 中国科学院知识创新工程重大项目 (KZCX1-SW -0 4) ;; 国家自然科学基金重点项目 ( 90 10 2 0 0 6 )
【CateGory Index】: U213.14
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