摘要
地表水热状况是影响地表植被生长、地气能量平衡以及建(构)筑物基础稳定性的重要因素。以北麓河现场监测数据为基础,分析了多年冻土区活动层水热宏观迁移规律以及相应的水热耦合机理。分析结果表明:1)不同深度处土层温度和水分变化规律相似,但温度、水分波动随着深度增加而减小、初始冻结时间也随着深度增加推迟;2)冬季未参加相变的水分占到初始含水量的50%左右;3)土体基质势与含水量有良好的相关性。土壤的温度变化和冻结融化过程明显地受到土壤含水量的影响,p F meter可以应用于冻土水分迁移研究。
The surface moisture- heat conditions are of important factors for vegetation growth,energy balance of the earth atmosphere system,and the stability of building foundation. Based on observed data of monitoring section in Beiluhe,the features of soil moisture- heat migration and the hydrothermal coupling mechanism were analyzed. The monitoring results show that the variation laws of soil temperature and unfrozen water content at the different soil layers were consistent. But the effects of temperature and moisture boundary on surface decreased with the depth,so did the fluctuations of temperature and moisture. The initial freezing time delayed with the depth of soil increasing. The unfrozen water content accounted for about 50% of the initial water content. Soil matric potential had good correlation with water content. The content and migration of soil water had a significant impact on the seasonally freezing and thawing process within the active layer. p F meter matric potential sensor can be used in the research of moisture migration.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第9期176-181,共6页
Journal of Arid Land Resources and Environment
基金
国家重点基础研究发展计划项目(2012CB026106)
中科院"百人计划"项目(Y251561001)
国家电网公司科技项目(SGJSJS-2010-935-936)共同资助
关键词
多年冻土
水热迁移
现场监测
未冻水含量
北麓河
permafrost
heat and water migration
field monitoring
unfrozen water content
