稳定积雪覆盖下的季节性冻土水分特征及其数值模拟
The Study of Moisture Characteristics and Numerical Simulation in Seasonal Frozen Soil under the Stable Snow Cover
  
DOI:
中文关键词:  积雪覆盖  水分迁移  季节性冻土  有限差分法
英文关键词:the snow cover, moisture transfer, seasonal frozen soil, finite difference method
基金项目:国家自然科学基金(51279031;51209039);黑龙江省自然科学基金(E201241);哈尔滨市科技创新人才专项资金(2010RFXXN043);教育部新世纪优秀人才支持计划
作者单位
付强 东北农业大学 水利与建筑学院 
马效松 东北农业大学 水利与建筑学院 
王子龙 东北农业大学 水利与建筑学院 
李天霄 东北农业大学 水利与建筑学院 
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中文摘要:
      为了深入研究积雪覆盖边界条件下的土壤水分迁移规律,通过冬季野外土壤水分观测试验,利用土壤水动力学理论,建立了稳定积雪覆盖条件下季节性冻土水分迁移模型。研究结果表明,积雪覆盖土壤比裸地平均地温高出1 ℃,土壤体积含水率(土壤剖面0~100 cm内)高出2%,体现了积雪覆盖不仅能够阻碍土壤热量散失,而且能保持土壤墒情;建立的水分迁移模型能够精准的模拟积雪覆盖条件下冻结土壤水分迁移动态,其相对平均误差仅为3.51%。研究结果对于丰富和完善冻土水分迁移理论,解决春旱和冬小麦“冷拔”等问题具有重要的理论和实践意义。
英文摘要:
      For an in-depth study on the soil moisture transfer law of snow-covered boundary conditions, a moisture transfer model of seasonal frozen soil under the stable snow-covered condition was established ,which through the observed experiments of the winter soil moisture and using the soil hydrodynamics theory. The study result shows that: the average temperature of soil which covered with snow is 1℃ higher than the bare and the water content of unit volume (soil profile is 0cm to 100cm) is 2% higher. It reflects that the covered snow can not only prevent the loss of soil heat, but also maintain the soil moisture content. The model can accurately simulate the transfer dynamics of frozen soil under the snow cover. The relative average inaccuracy is just 3.51%.The research result has important theoretical and practical significance to rich and perfect the frozen soil moisture transfer theory and solved the spring drought and “cold drawing” of winter wheat and so on.
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