尚建国^1,2,,
张廷军^1,,,
高坛光¹,
牟翠翠¹,
王树发¹,
范成彦¹,
仲文¹
1. 兰州大学资源环境学院, 西部环境教育部重点实验室, 甘肃 兰州 730000
2. 63983部队, 江苏 无锡 214035

基金项目: 中国科学院战略性先导科技（A类）专项项目（批准号：XDA20100103和XDA20100313）和国家自然科学基金项目（批准号：41871050和41801028）共同资助


详细信息

作者简介: 尚建国, 男, 35岁, 硕士研究生, 地图学与地理信息系统专业, E-mail:shangjg15@lzu.edu.cn

通讯作者: 张廷军, E-mail:tjzhang@lzu.edu.cn

中图分类号: P642.21;P642.14;TP75

收稿日期:2019-05-17
修回日期:2019-07-19
刊出日期:2019-09-30

Characteristics of thaw slumps over Eboling areas in Qilian Mountains using remote sensing data

Shang Jianguo^1,2,,
Zhang Tingjun^1,,,
Gao Tanguang¹,
Mu Cuicui¹,
Wang Shufa¹,
Fan Chengyan¹,
Zhong Wen¹
1. Key Laboratory of Western China's Environmental Systems(Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu
2. 63983 Unit, Wuxi 214035, Jiangsu


More Information

Corresponding author: Zhang Tingjun,E-mail:tjzhang@lzu.edu.cn

MSC: P642.21;P642.14;TP75

--> Received Date: 17 May 2019
Revised Date: 19 July 2019
Publish Date: 30 September 2019


摘要
摘要:热融滑塌是山地多年冻土退化最直接的表现形式之一，通过解译祁连山俄博岭地区遥感影像，结合实地考察，对俄博岭热融滑塌的空间分布和时间变化进行了研究，明确了热融滑塌的发育特征。结果表明，俄博岭热融滑塌发育活跃，1997~2015年热融滑塌数量增加（11~13个），面积增大（7765~20605 m²），其中1997~2009年面积增加速率为679.9 m²/a，2009~2015年面积增加速率为780.2 m²/a。通过分析热融滑塌景观分布与地形因子的关系，发现俄博岭热融滑塌在海拔3570~3700 m，坡度3°~10°的富冰多年冻土区北向斜坡发育；通过对典型热融滑塌溯源后退速率分析发现，1997~2009年其平均后退速率为2 m/a，2009~2015年平均后退速率为5 m/a，呈明显增大趋势，且其后退速率主要与坡度、地下冰含量和地表径流相关。
关键词: 热融滑塌/
发育特征/
多年冻土

Abstract:Thaw slumps or thermokarst in general are the most direct manifestations of permafrost degradation in cold regions. Development of thaw slumps and thermokarst terrains has significant impact on surface energy balance, surface and subsurface hydrological processes, vegetation, soil carbon fluxes, geomorphological processes, and engineering constructions. The objective of this study is to investigate the occurrence and development of thaw slumps and thermokarst terrains in northern Tibetan Plateau during the past few decades. Aerial photographs in 1997 and satellite imageries in 2009 and 2015 were used to analyze creation and expansion of thaw slumps and thermokarst terrains. Field survey was conducted during the summers of 2016 and 2017 to validate the results from aerial photographs and satellite imageries. The results show that there were 13 active thaw slumps over Eboling areas in Qilian Mountains of northern Tibetan Plateau in 2015. Thaw slumps are mainly developed at elevation between 3570 m and 3700 m above sea level on north-facing slopes with slope angles varying from 3°~10°。Based on remote sensing data, the total thaw slump covered area increased from 7765 m² to 20605 m² over a period from 1997 through 2015 with an average rate about 713.3 m²/a. However, the rate expansion of thaw slump area was about 679.9 m²/a from 1997 through 2009 and increased to 780.2 m²/a from 2009 through 2015. The retrogressive erosion rate toward the upper slope was about 2 m/a during 1997 through 2009 period and increased about 5 m/a during 2009 to 2015 period. The controlling factors for retrogressive erosion rate were slope angles, ground ice content and surface water runoff.
Key words:thaw slump/
thermokarst/
permafrost



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