投稿中心

审稿中心

编辑中心

期刊出版

网站地图

友情链接

引用本文:胡晓莹,盛煜,吴吉春,李静,曹伟.青藏高原热融湖塘的水热过程及其对下伏多年冻土的热影响.湖泊科学,2018,30(3):825-835. DOI:10.18307/2018.0324
HU Xiaoying,SHENG Yu,WU Jichun,LI Jing,CAO Wei.Hydrothermal processes of thermokarst ponds in the Tibetan Plateau and its thermal impact on the underlying permafrost. J. Lake Sci.2018,30(3):825-835. DOI:10.18307/2018.0324
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 359次   下载 181 本文二维码信息
码上扫一扫!
分享到: 微信 更多
青藏高原热融湖塘的水热过程及其对下伏多年冻土的热影响
胡晓莹1,2, 盛煜1, 吴吉春1, 李静1, 曹伟1
1.中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 兰州 730000;2.中国科学院大学, 北京 100049
摘要:
以青藏高原查拉坪地区一处热融湖塘(40 m×50 m,最大深度为1 m)为研究对象,由实测数据对比分析了热融湖塘与天然地表相同深度的温度变化特征.结果表明:与天然地表相比,热融湖塘融化时间长,冻结时间短,且存在接近4℃的水温变化;受太阳辐射及热对流的影响,垂向水温梯度仅在水表从4℃降温及冻结阶段较大,其余时段接近0;湖底年均温度比相同深度的天然地表高约6.4℃,湖底下部存在约14 m深随时间发展的融区,土体吸热增大,放热减小;热融湖塘2.5~3.0 m土体的年内热交换为19592.0 kJ/m2,约是天然地表的230倍,其中吸热量及放热量分别为后者的1.4倍及8.7%.湖塘下部的融化夹层是深层冻土的主要热源,湖塘对下部土体放热的抑制作用是湖塘对土体产生热影响的主要原因.
关键词:  热融湖塘  水热过程  地温梯度  融化夹层  热交换  青藏高原
DOI:10.18307/2018.0324
分类号:
基金项目:国家重大科学研究计划项目(91647103)、中国科学院重点部署项目(KZZD-EW-13)和国家自然科学基金项目(41501079)联合资助.
Hydrothermal processes of thermokarst ponds in the Tibetan Plateau and its thermal impact on the underlying permafrost
HU Xiaoying1,2, SHENG Yu1, WU Jichun1, LI Jing1, CAO Wei1
1.State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
A thermokarst pond (40 m×50 m, the maximum depth is 1 m) in the Chalaping of Tibetan Pleatu was regarded as a research object. Based on the measured data, the temperature variations and characteristics of thermokarst pond and natural ground at the same depth were analyzed. The results indicated that, compared with the natural ground, the thermokarst pond had a longer thawed time, a shorter frozen time, and a special time with water temperature being about 4℃. Due to the solar short radiation and convective heat transfer, the water temperature gradient in vertical was large during the surface temperature being decreasing from 4℃ and in the frozen stage, and other stages the water temperature gradient in vertical was almost zero. The annual average temperature at the bottom of pond was higher about 6.4℃ than that at the same depth of the natural ground. Besides, there was a talik being about 14 m depth under the bottom of pond being developing with time, and the heat absorbed and released of soil under the pond were increased and decreased, respectively. The heat absorbed from the depth of 2.5 to 3.0 m under the thermokarst pond was about 19592.0 kJ/m2 being about 230 times of that under the natural ground,the heat absorbed was 1.4 times of the natural ground, but the heat released was only 8.7% of the natural ground. So, the talik was the main heat resource to the deeper permafrost, and the thermal impact of thermokarst pond on the permafrost underlying was due to the decrease of heat released from the soil.
Key words:  Thermokarst pond  hydrothermal processes  gradient of ground temperature  talik  heat exchange  Tibetan Plateau
分享按钮