黄河源湖间冻土区温度场与活动层厚度的变化  

The Variation of Temperature and Thickness of Actire Layer Between Lakes in the Yellow River Source Region

作　　者：冯雨晴[1] 梁四海[1] 洪涛 万力[1] 赵珍伟[3] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083 [2]中国地质科学研究院岩溶地质研究所,广西桂林541004 [3]中国辐射防护研究院,山西太原030006

出　　处：《人民黄河》2015年第5期15-19,共5页Yellow River

基　　金：国家自然科学基金重点项目(41330643);国家自然科学基金资助项目(41072191)

摘　　要：采用黄河源区2012年8月—2013年7月的日尺度地温观测数据,运用含有水相变化的地下水运动的水-热耦合原理,利用SUTRA-ice软件建立了模拟冻土在冻融过程中温度场分布的二维模型,在校正模型参数的基础上,预测了未来情景下黄河源区多年冻土活动层厚度的变化情况。结果表明:黄河源区冻土活动层浅层地温最高为14℃,最低为-9.5℃,分别出现在7月、1月;土壤温度变幅从浅层20 cm到深层150 cm不断减小且存在滞后现象,与20 cm处的冻结日期相比,50、90、120、150 cm处分别滞后9、24、41、51 d;在假定升温率为0.04℃/a的情景下,黄河源区冻土活动层厚度由3.90 m增加到20 a后的5.86 m,增加率为9.8 cm/a。Based on the earth temperature observation data in the Yellow River source region, a 2D model was built to simulate the tempera- ture variation through the freezing - thawing process of seasonal frozen soil by using the hydrothermal principle of groundwater movement with water - ice phase change. In order to successfuUy simulate the model, the U. S. Geological Survey＇ s modified SUTRA code was used. The results show that the maximum and the lowest temperature are 14 % and - 9.5℃ of the active layer, and occur in July and January respectively in the lowest layer. The amplitudes of temperature decrease from 20 cm to 150 cm. The delay time of freezing time at 50 cm, 90 cm, 120 cm and 150 cm are 9 , 24 , 41 and 51 days compare to that of 20 cm. The thickness of active layer increase from 3.9 m to 5.9 m at the rate of 9.8 cm/a in 20 years, under an scenario of air temperature increasing 4 ℃ per 100 years.

关 键 词：活动层 地温 冻土 黄河源区 

分 类 号：P642.14[天文地球—工程地质学] TV882.1[天文地球—地质矿产勘探]