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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Modeling study of talik freeze-up and permafrost response under drained thaw lakes on the Alaskan Arctic Coastal Plain - art. no. D01111
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Modeling study of talik freeze-up and permafrost response under drained thaw lakes on the Alaskan Arctic Coastal Plain - art. no. D01111

机译:在阿拉斯加北极沿海平原排水的融化湖下滑石粉冻结和多年冻土响应的模型研究-艺术。没有。 D01111

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摘要

Numerical simulations were conducted to investigate the long-term impact of thaw lake drainage on the thermal regime of ground under and around drained thaw lakes on the Alaskan Arctic Coastal Plain. The numerical model used in this study is a two-dimensional unsteady finite element model for heat transfer with phase change under a cylindrical coordinate system. The initial conditions are the simulated ground thermal regime and talik thickness data at year 3000 under a thaw lake with long-term mean lake bottom temperatures of 1.0, 2.0, and 3.0degreesC near Barrow, Alaska. The simulated results indicate that lake drainage leads to a rapid freeze-up of talik and a substantial decrease in permafrost temperatures under the former lake bottom. The initial ground temperature conditions have significant influence not only on the talik freeze-up time, but also on the permafrost temperature decrease processes. After thaw lake drainage, taliks with thicknesses of 28, 43, and 53 m under the lake will freeze-up completely by 40, 106, and 157 years, and the corresponding ratios of upward and downward freeze-up depths for the three simulation cases are 1: 8.0, 1: 7.6, and 1: 6.1, respectively. After completion of talik freeze-up, permafrost temperatures still decreased with time and gradually reached a relatively stable value, depending on the initial ground temperature and the distance to the former lake bottom. [References: 38]
机译:进行了数值模拟,以研究融化湖排水对阿拉斯加北极沿海平原上融化湖下方和周围的地面热力状况的长期影响。本研究中使用的数值模型是二维非定常有限元模型,用于圆柱坐标系下具有相变的热传递。初始条件是在阿拉斯加巴罗附近的融化湖的长期平均湖底温度分别为1.0、2.0和3.0摄氏度的情况下,在3000年时模拟的地面热力状况和滑石厚度数据。模拟结果表明,湖泊排水导致滑石迅速冻结,并且在原湖底下的多年冻土温度大大降低。初始地面温度条件不仅对滑石冻结时间有重大影响,而且对多年冻土温度降低过程也有重要影响。融化湖水后,湖下厚度分别为28、43和53 m的滑石将完全冻结40、106和157年,三种模拟情况的相应的向上和向下冻结深度比率分别是1:8.0、1:7.6和1:6.1。滑石粉冻结完成后,多年冻土温度仍会随时间下降,并逐渐达到相对稳定的值,具体取决于初始地面温度和距前湖底的距离。 [参考:38]

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