东北低山丘陵区季节性积雪特性研究

发布时间：2018-05-24 10:50

本文选题：积雪深度 + 积雪密度　；参考：《水土保持学报》2017年01期

【摘要】：为探究东北低山丘陵区冬季积雪物理特性变化过程,利用超声雪深监测仪和Snow Fork雪特性分析仪采集积雪物理特性(积雪深度、积雪密度、液态含水率)数据,分析积雪深度、密度和液态含水率随时间的变化特征及其在垂直剖面上的变化过程。结果表明:主要积雪期为11月下旬至翌年2月中下旬,积雪深度与雪层温度、气温呈显著负相关关系,与降雪量呈正相关关系。积雪消融主要集中在10:00—18:00之间,且积雪消融相对于气温表现出滞后性,滞后时间约为4h。积雪初(12月1日观测),雪底层密度为0.198g/cm~3,表层为0.126g/cm~3,从底层至表层呈逐渐减小趋势。随着雪底层形成深霜,中间层5—10cm的积雪密度大于表层和底层。积雪0—5,5—10,10—15cm层平均液态含水率分别为0.308%,0.319%和0.205%,中间层最高,整体表现为单峰型。积雪液态含水率与积雪密度呈显著正相关关系(r=0.866,p0.05)。研究结果将为融雪径流形成、融雪侵蚀防治以及季节性积雪区生态系统功能评估提供基础数据。
[Abstract]:In order to investigate the variation process of snow cover physical characteristics in northeast hilly region in winter, the data (snow depth, snow density, liquid moisture content) were collected by ultrasonic snow depth monitor and Snow Fork snow characteristic analyzer, and the snow depth was analyzed. The variation characteristics of density and liquid water content with time and their change process in vertical profile. The results show that the main snow cover period is from late November to late February of the following year. The snow depth has a significant negative correlation with the snow layer temperature and temperature, and a positive correlation with the amount of snow fall. The melting of snow was mainly between 10: 00-18: 00, and the time lag was about 4 hours. The density of the snow bottom is 0.198 g / cm ~ (3) and 0.126 g / cm ~ (3) at the beginning of snow cover (December 1), which decreases gradually from the bottom to the surface. With the formation of deep frost at the bottom of the snow, the snow density of 5-10cm in the middle layer is higher than that in the surface layer and the bottom layer. The average liquid water content of 0-5 ~ 10 ~ (-10) ~ 10 ~ (-15) cm layer is 0.308% and 0.205%, respectively. The middle layer is the highest, and the whole is a single-peak type. There was a significant positive correlation between snow moisture content and snow density. The results will provide the basic data for the formation of snowmelt runoff, the prevention and control of snowmelt erosion and the assessment of ecosystem function in seasonal snow cover areas.
【作者单位】：沈阳农业大学水利学院;沈阳天功园林工程有限公司;
【基金】：国家自然科学基金项目(41471225) 辽宁省农业领域青年科技创新人才培养计划项目(2014054) 辽宁省高等学校优秀人才支持计划项目(LJQ2013074)
【分类号】：P426.635

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