摘要
以发育于青藏高原多年冻土区的红梁河热融湖塘为例,研究了热融湖塘附近土体的热状态变化特征,以及其对湖岸多年冻土上、下限影响情况.结果表明:热融湖塘侧向热影响改变了热融湖塘下部和周围区域土体的热状态,使周围土体热状态处于动平衡状态,既受热融湖塘的热影响,也受到周围多年冻土的热影响.热融湖塘对周围浅层土体温度和多年冻土上限影响相对较小,但热融湖塘热影响引起了湖岸边缘的多年冻土上限增大和地温升高.热融湖塘对深部土体温度和多年冻土厚度有较大的影响.
Taking the thermokarst lake by the Hongliang River,a typical thermokarst lake in the permafrost regions of the Tibetan Plateau,as a case,the effect of thermokarst lake on the thermal regimes of soil and permafrost table under and around the lake is studied.The results show that the predominant lateral heat effect of the thermakarst lake changes the thermal regimes of the soils in the lakebed and the lakeshore.As a result,the surrounding soil thermal regime,affected by the thermakarst lake and the surrounding permafrost,is in a dynamic balance process.The thermokarst lake itself has less impact on the subsurface temperature and the permafrost table in the surrounding soils,but the thermal effect of thermokarst lake results in permafrost table rising and ground temperature rising in the margins of lakeshore.Therefore,the thermokarst lake has a great influence on the permafrost temperature and the permafrost depth for the surrounding soils,especially near the margins of lakeshore.
出处
《冰川冻土》
CSCD
北大核心
2010年第4期755-760,共6页
Journal of Glaciology and Geocryology
基金
国家自然科学基金杰出青年基金项目(40625004)
国家自然科学基金项目(40801024)资助
中国科学院重要方向群项目(KZCX2-YW-Q03-08)
关键词
热融湖塘
多年冻土
热影响
thermokarst lake
permafrost
heat effect
