积雪边界条件下冻融土壤水热耦合迁移模型及数值模拟研究——以松嫩平原黑土为例

项目名称： 积雪边界条件下冻融土壤水热耦合迁移模型及数值模拟研究——以松嫩平原黑土为例

项目编号： No.51209039

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 王子龙

作者单位： 东北农业大学

项目金额： 27万元

中文摘要： 积雪覆盖是松嫩平原黑土区最普遍和最重要的冻融土壤边界条件形式，积雪内部水热迁移物理过程及积雪与土壤水热动态联系的复杂性，给积雪边界条件下冻融土壤水热迁移的定量化描述带来了很高的不确定性和较大的数值模拟误差。为定量表征积雪与土壤的水热联系，更准确地模拟和预测积雪边界条件下冻融土壤水分运动和热流传导过程，本项目将在试验研究和理论分析的基础上，通过复杂精细积雪水热迁移模式的数值模拟试验，识别影响积雪底面水热通量输出的关键因子；揭示不同积雪条件下土壤表层水热状况变化规律，建立积雪-土壤表层含水率、温度响应函数模型；优化估计土壤水热迁移特征参数，构建积雪边界条件下冻融土壤水热耦合迁移数学模型并进行数值模拟分析与验证。研究成果对于揭示积雪与土壤表层水热映射关系，完善冻融土壤水热迁移理论体系，实现冻融期土壤水热定量调控，提高松嫩平原黑土水热资源利用效率具有重要的理论价值与现实意义。

中文关键词： 积雪覆盖；冻融土壤；水热迁移；松嫩平原黑土；春季旱涝风险

英文摘要： Snow cover is the most common and important boundary condition of freezing and thawing soils in the black soil region of Songnen Plain. The complexities of the physical process of moisture and heat transfer within snow and the dynamic moisture and heat connections between snow and soil cause high uncertainty and great error to quantitative descriptions of moisture and heat transfer in freezing and thawing soils covered by snow. To formulate moisture and heat connections between snow and soil quantitatively and simulate and predict moisture and heat transfer in freezing and thawing soil covered by snow more precisely, we plan to carry out experimental and theoretical studies to identify key factors influencing moisture and heat fluxes output from snow cover bottom by numerical simulation experiments of complicated and elaborate snow mode, to reveal moisture and heat transfer regularities of topsoil under different snow conditions and present response functions between snow and topsoil moisture and temperature, to optimally estimate soil moisture and heat transfer parameters and model and simulate coupled moisture and heat transfer in freezing and thawing soil covered by snow. The research results have important theoretical values and practical significances to reveal mapping relations between snow and soil surfac

英文关键词： snow cover；freezing and thawing soil；moisture and heat transfer；black soils in Songnen Plain；drought and flood risk in spring