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基于移动网格技术的热融湖动态演化过程数值模拟
引用本文:杨振,温智,马巍,孙志忠,牛富俊,俞祁浩.基于移动网格技术的热融湖动态演化过程数值模拟[J].冰川冻土,2015,37(1):183-191.
作者姓名:杨振  温智  马巍  孙志忠  牛富俊  俞祁浩
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,甘肃兰州730000;煤炭工业郑州设计研究院股份有限公司,河南郑州450007;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,甘肃兰州,730000
基金项目:国家自然科学基金项目(41171059; 41471061; 40801024); 国家重点基础研究发展计划(973计划)项目(2012CB026101); 中国科学院"百人计划"项目(Y251561001); 冻土工程国家重点实验室自主课题(SKLFSE-ZY-12)资助
摘    要:基于移动网格技术建立了热融湖动态演化有限元数值模型,研究了青藏高原多年冻土区典型热融湖动态演化过程,分析了热融湖半径、深度的变化过程及其对湖底及周围多年冻土温度状况的影响.结果表明:在移动边界热融湖模型中,热融湖半径以0.7 m·a-1的速度近线性地增大;随着下伏高含冰量冻土的融化,热融湖深度增加先慢后快,最后逐渐减小趋于稳定.热融湖深度和半径从5月末至翌年1月末增加显著,在2-5月间基本保持稳定.伴随着热融湖的扩展,地表边界逐渐演变为湖底边界,热融湖的热影响范围逐渐增大.在固定边界热融湖模型中,其热影响会逐渐趋于稳定,由于初始尺寸大,其湖底多年冻土退化速率大于移动边界模型,而远离湖边的多年冻土退化速率要小于移动边界模型.如果不考虑热融湖边界随时间的变化,可能会高估热融湖对湖底多年冻土的热影响,而低估其对附近多年冻土的热影响.

关 键 词:移动网格  热融湖  数值模拟  地温状况
收稿时间:2014-07-11

Numerical simulation on the dynamic evolution process of thermokarst lake based on the moving mesh technology
YANG Zhen,WEN Zhi,MA Wei,SUN Zhizhong,NIU Fujun,YU Qihao.Numerical simulation on the dynamic evolution process of thermokarst lake based on the moving mesh technology[J].Journal of Glaciology and Geocryology,2015,37(1):183-191.
Authors:YANG Zhen  WEN Zhi  MA Wei  SUN Zhizhong  NIU Fujun  YU Qihao
Institution:1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Zhengzhou Design and Research Institute of Coal Industry Co., Ltd., Zhengzhou 450007, China
Abstract:Based on the method of moving mesh, a heat transfer finite element numerical model with phase change under cylindrical system was presented. The thermal change and morphologic process of thermokarst lakes were investigated. The results showed that the thermokarst lake expanded at a linear rate of 0.7 m·a-1. The depth of the lake increased with the thawing of ice-rich permafrost. The increasing rate in depth was slow at first, then it became fast, finally it kept constant. The process of expansion and the settlement of the lake was significant during the period of May to Jan. next year, while they were suspended from Feb. to May. The scope of thermal effect increased gradually in the moving boundary model, while it increased firstly and then kept constant in the fixed boundary model. The results showed that the fixed boundary model may overestimate the thermal effect on permafrost under the thermokarst lake and underestimate the thermal effect on permafrost far from the lake.
Keywords:moving mesh  thermokarst lake  numerical simulation  thermal regime
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