土体水分蒸发模型研究进展

发布时间：2018-05-20 11:00

本文选题：土体 + 蒸发模型　；参考：《高校地质学报》2017年04期

【摘要】：土体水分蒸发是土体-大气物质和能量交换的主要过程之一,对土体的工程性质有重要影响。尤其是近些年来,受全球气候变化影响,极端干旱性气候频繁发生,与蒸发相关的岩土和地质工程问题越来越突出,逐渐成为国际研究的热点。建立土体水分蒸发模型是该课题研究的首要目标,对准确评估和预测气候作用下土体水分场信息有重要理论和现实意义。着重对国内外学者近几十年来围绕土体水分蒸发模型所取得的研究成果进行了归纳和总结,依据各种模型的理论基础进行了分类,总体上可分为表面能量平衡模型、水量平衡模型、质量传输模型、阻力模型、温度-风速模型及吸力模型等六大类别。在此基础上,分别阐述了各类模型的研究进展,并对其中一些代表性模型进行了详细介绍,对比分析了各个模型之间的联系与区别,并探讨了它们的优缺点和适应条件。总体而言,现有的模型存在重气象因素而轻土性因素的特点,对砂土和饱和土具有较好的适应性,而对黏性土和非饱和土的适应性较差。基于此,结合本学科的特色和研究背景,提出了今后该课题的研究重点,包括非饱和土的蒸发模型问题研究、黏性土水分蒸发模型研究、考虑土体裂隙参数的土体水分蒸发模型研究、构建通用型的土体水分蒸发模型等几个方面。
[Abstract]:Soil moisture evaporation is one of the main processes of soil-atmosphere material and energy exchange, which has an important effect on the engineering properties of soil. Especially in recent years, due to the influence of global climate change, extreme arid climate occurs frequently, and the geotechnical and geotechnical problems related to evaporation become more and more prominent, and gradually become the focus of international research. The establishment of soil moisture evaporation model is the primary objective of this research, which has important theoretical and practical significance for accurately evaluating and predicting the soil moisture field information under the action of climate. The research results of soil water evaporation model obtained by domestic and foreign scholars in recent decades are summarized and classified according to the theoretical basis of various models, which can be divided into surface energy balance model. Water balance model, mass transfer model, resistance model, temperature-wind model and suction model. On this basis, the research progress of various models is described, and some representative models are introduced in detail. The relationship and difference between each model are compared and analyzed, and their advantages, disadvantages and adaptive conditions are discussed. In general, the existing models have the characteristics of heavy meteorological factors but light soil factors, which have good adaptability to sand and saturated soil, but not to clay and unsaturated soil. Based on this, combined with the characteristics and research background of this subject, this paper puts forward the research focus of this subject in the future, including the evaporation model of unsaturated soil, the water evaporation model of clay soil, and the water evaporation model of clay soil. This paper studies the soil moisture evaporation model considering the soil fissure parameters, and constructs a general soil moisture evaporation model.
【作者单位】：南京大学地球科学与工程学院;
【基金】：国家自然学科基金项目(41572246;41772280);国家自然科学基金重点项目(41230636) 优秀青年科学基金项目(41322019) 江苏省自然科学基金项目(BK20171228;BK20170394) 中央高校基本科研业务费专项资金联合资助
【分类号】：TU43

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