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地球科学进展  2013, Vol. 28 Issue (6): 695-702    DOI: 10.11867/j.issn.1001-8166.2013.06.0695
研究论文     
青藏公路沿线热喀斯特湖分布特征及其热效应研究
牛富俊1,董 晟2,林战举1,鲁嘉濠1,罗 京1
1.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;2.北京工业大学建筑工程学院,北京 100124
Distribution of Thermokarst Lakes and Its Thermal Influence on  Permafrost along Qinghai-Tibet Highway
Niu Fujun, Dong  Cheng, Lin Zhanju, Lu Jiahao, Luo Jing
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.The College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
 全文: PDF(3861 KB)  
摘要:

热喀斯特湖的出现和发育是多年冻土变暖的指示器,研究热喀斯特湖发育及其热效应是应对青藏高原气候变化和人类活动诱发冻土灾害的基础工作。基于SPOT5卫星影像资料,在ArcGIS平台下解译遥感影像,获取了青藏公路沿线楚玛尔河至风火山段热喀斯特湖的数量和分布特征,这些热喀斯特湖以楚玛尔河高平原和北麓河盆地为主要分布区,且80%发育于高含冰量多年冻土区。热喀斯特湖通过竖向和侧向2种传热方式影响多年冻土,竖向传热会造成其下部多年冻土融穿,侧向传热会造成湖岸多年冻土增温,扩大热影响范围。通过北麓河地区一典型热喀斯特湖的数值计算,湖全年都在向湖岸放热。当热喀斯特湖离路基较近,将会对公路产生潜在或者直接的危害,其侧向热侵蚀往往会导致冻土路基温度升高,诱发路基病害。

关键词: 侧向热侵蚀青藏公路热喀斯特湖分布特征冻土    
Abstract:

The occurrence of thermokarst lake is an indicator implying the permafrost warming. A study of  thermokarst lake and their thermal effect will become an important basic work that responds to the permafrost hazards induced by the climate changes and the anthropogenic activities on the QinghaiTibet Plateau. Based on SPOT-5 satellite image data, we interpreted and obtained  the area and quantity of thermokarst lakes from Chumaerhe to Fenghuoshan Mountain section along the Qinghai-Tibet Highway under the ArcGIS platform in this paper. The result shows that these thermokarst lakes have mainly spread in Chumaerhe High Plains and Beiluhe Basin and approximately 80% lakes have been developing in rich-ice permafrost regions. The thermokarst lake influences  the permafrost through downward and lateral heat transfer. The downward heat transfer  accelerates the thawing of permafrost and the formation of an open-talik, the lateral heat erosion will cause the permafrost warming at lakeshore and expand the scope of the heat-affected. The modeled result of a typical thermokarst lake in Beiluhe Basin shows that the lake has always released the heat to lakeshore in a whole year. If the thermokarst lake is  close to the roadbed, it will cause influence on the  stability of roadbed, especially the lateral thermal erosion often leads to the temperature increases of frozen soil subgrade and induces  the embankment disease.

Key words: Qinghai-Tibet Highway    Thermokarst lake    Distribution characteristics    Permafrost    Lateral thermal erosion
收稿日期: 2012-11-19 出版日期: 2013-06-10
:  P642.14  
基金资助:

中国科学院寒区旱区环境与工程研究所人才基金项目“青藏工程走廊内热融湖时空演化研究”;国家重点基础研究发展计划项目“高原工程走廊内冻土变化及其灾害时空演化规律”(编号:2012CB02610)资助.

作者简介: 牛富俊(1970-), 男, 甘肃会宁人,研究员,主要从事寒区岩土工程与地质灾害及环境研究.E-mail:niufujun@lzb.ac.cn
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引用本文:

牛富俊,董晟,林战举,鲁嘉濠,罗京. 青藏公路沿线热喀斯特湖分布特征及其热效应研究[J]. 地球科学进展, 2013, 28(6): 695-702.

Niu Fujun, Dong Cheng, Lin Zhanju, Lu Jiahao, Luo Jing. Distribution of Thermokarst Lakes and Its Thermal Influence on  Permafrost along Qinghai-Tibet Highway. Advances in Earth Science, 2013, 28(6): 695-702.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2013.06.0695        http://www.adearth.ac.cn/CN/Y2013/V28/I6/695

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