降水对多年冻土活动层水热影响定量分析

发布时间：2018-03-26 07:31

本文选题：多年冻土　切入点：能量变化　出处：《干旱区资源与环境》2017年07期

【摘要】：青藏高原降水变化直接影响多年冻土稳定性及高原生态环境的演变。为定量研究青藏高原降水对多年冻土活动层水热的影响,文中以北麓河冻土工程与环境综合观测站2013年降水资料和活动层水热数据为基础,定量分析了不同季节和不同时刻降水与活动层水热状态的关系。结果表明:1)北麓河地区暖季的高频率、小雨量降水对冻土活动层具有明显的冷却效果;2)冷季降水以少量降雪为主,雪盖厚度薄、持续时间短,不能起到保温层作用,快速融化的雪水反而升高活动层温度;3)不同时刻降雨对活动层的热影响差异明显,14点左右的降雨产生的能量变量最大。
[Abstract]:The variation of precipitation in Qinghai-Xizang Plateau directly affects the stability of permafrost and the evolution of ecological environment in plateau. The paper is based on the precipitation data and active layer hydrothermal data from the integrated observation station of permafrost engineering and environment in the Beilu River in 2013. The relationship between precipitation in different seasons and different times and the hydrothermal state of active layer is quantitatively analyzed. The results show that the high frequency of warm season in Beilu River area, The precipitation of small rainfall has obvious cooling effect on the active layer of frozen soil. The precipitation in the cold season is mainly a small amount of snow, the thickness of snow cover is thin and the duration is short, so it can not act as a insulation layer. On the contrary, the rapidly melting snow water increases the active layer temperature 3) the heat effect of rainfall on the active layer is obviously different at different times. The maximum energy variable is produced by rainfall at about 14 points.
【作者单位】：中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室;中国科学院大学;兰州理工大学土木工程学院;
【基金】：国家自然科学基金项目(41471061和41690144) 冻土工程国家重点实验室自主课题(SKLFSE-ZT-22) 中科院寒旱所STS项目(HHS-TSS-STS-1502)资助
【分类号】：P642.14;P426.615

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