兰州马衔山多年冻土活动层厚度估算及影响因素分析

发布时间：2018-03-05 11:06

本文选题：X-G算法　切入点：含水量　出处：《冰川冻土》2015年06期 　论文类型：期刊论文

【摘要】：马衔山残存的多年冻土被誉为黄土高原地区多年冻土的"活化石".自1986年发现多年冻土存在至今,多年冻土发生了严重的退化,活动层厚度增大,面积由原来的0.16 km2减少到现在的0.134 km2.本文基于马衔山多年冻土区的实际监测资料分析了气温、地表温度和N系数随时间变化特征以及活动层温度、土壤含水量的时空特征.根据2010-2013年马衔山多年冻土区的日平均地表温度和土壤参数实测及实验室分析资料,利用X-G算法模拟了马衔山多年冻土的冻融过程,并模拟得到4年的活动层厚度均比实测值小,这可能与活动层底部较高的未冻水含量有关.然后进一步探讨了泥炭层和含水量对活动层厚度的影响,泥炭层越厚,其隔热作用越强,活动层厚度越小;反之,活动层厚度越大;含水量越高,土壤的容积热容量越大,活动层厚度越小;反之,活动层厚度越大.
[Abstract]:The remaining permafrost in Mount Ma armature is known as the "living fossil" of permafrost in the Loess Plateau. Since the permafrost was discovered in 1986, the permafrost has been degraded seriously and the active layer thickness has increased. The area is reduced from 0. 16 km2 to 0. 134 km2. Based on the actual monitoring data of the permafrost area in Maarshan, the variation characteristics of air temperature, surface temperature and N coefficient with time and the active layer temperature are analyzed in this paper. The temporal and spatial characteristics of soil moisture content. Based on the daily average surface temperature and soil parameters measured and laboratory analysis data of the permafrost region of Maaram Mountain from 2010 to 2013, the freezing and thawing process of the permafrost in Maaram Mountain was simulated by using X-G algorithm. The thickness of the active layer in 4 years is smaller than the measured value, which may be related to the high content of unfrozen water at the bottom of the active layer. Then, the influence of the peat layer and the water content on the thickness of the active layer is further discussed, the thicker the peat layer is, the more the thickness of the active layer is. The stronger the thermal insulation, the smaller the active layer thickness; conversely, the greater the active layer thickness; the higher the water content, the larger the volumetric heat capacity of soil, the smaller the active layer thickness; conversely, the greater the active layer thickness.
【作者单位】：中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室青藏高原冰冻圈观测研究站;中国科学院大学;
【基金】：国家重大科学研究计划项目(2013CBA01803) 中国科学院“百人计划”(51Y551831)资助
【分类号】：P642.14

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