水库下泄低温水对浅层包气带水热耦合运动的影响机理及径向基函数法模拟

项目名称： 水库下泄低温水对浅层包气带水热耦合运动的影响机理及径向基函数法模拟

项目编号： No.51309189

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 任杰

作者单位： 西安理工大学

项目金额： 25万元

中文摘要： 高坝大库的水库低温水，下泄后入渗到河道两岸，会形成下部低温水层和上部天然温度表层的土壤非等温环境，必将带来温度场和水分场的重分布，并直接对临近包气带生态环境产生影响。项目拟采取理论分析和概化土槽试验的方法，研究水库下泄低温水对浅层包气带水热运动的影响机理，并引入正则化技术和无网格径向基函数法，从空间结构入手，构建水热耦合运动的数值模型。首先基于实测资料分析水库低温水下泄对河道两岸土体水热运动的影响，找出主要影响因素，其次构建室内土体试验模拟系统，研究低温水入渗条件下内外因素对土体温度场及水分场的影响机理，最后采用径向基函数无网格法建立低温水入渗条件下浅层包气带水热耦合运动的数值模型，引入正则化技术研究解决模型的稳定性问题，实现水热耦合运动的无网格化数值模拟。研究成果可丰富土壤水动力学基本理论及其模拟方法，并可为进一步研究改善水库下游河岸带生态环境提供理论基础，有着重要的学科意义和实际价值。

中文关键词： 低温水；温度场；水分场；灵敏度分析；水热运移

英文摘要： Volumes of low-temperature water present in large reservoirs infiltrated to the two sides of the river will form the lower part of the low-temperature water layer and the upper part of the natural temperature of the surface of the non-isothermal environment of soil; it will bring the re-distribution of temperature field and moisture field, and impact directly the soil near the ecological environment. Theoretical analysis and generalization soil bin test were adopted to study the mechanism of low temperature water from reservoir on the water- heat transport in shallow vadose zone, leading into regularization techniques and meshless radial basis function method and building a numerical model of hydrothermal coupled motion from the spatial structure start. First, based on the measured data, the main factors were identified by analyzing the influence of low temperature water from reservoir on the water- heat transport in shallow vadose zone. The next to build indoor soil test simulation system to study the low-temperature water infiltration under the conditions of internal and external factors of soil temperature field the mechanism of the influence of the water field. Finally, using radial basis function meshless method to create a shallow unsaturated zone under conditions of low temperature water infiltration hydr

英文关键词： low water temperature；temperature field；moisture field；sensitivity analysis；water heat transfer