考虑多相流过程的地下水运移机理及模型研究

项目名称： 考虑多相流过程的地下水运移机理及模型研究

项目编号： No.50809044

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 武器工业

项目作者： 孙冬梅

作者单位： 天津大学

项目金额： 20万元

中文摘要： 地下水系统是一个多相流系统，水和溶质在地下的运移是一个包含气-液-固的多相复杂过程，建立考虑多相流过程的地下水数值模拟模型更接近地下水系统的物理本质。本项目的主要研究成果包括：（1）在理论上对考虑多相流过程的地下水运移机理进行研究，并在此基础上建立三维水-NAPL-气-热多相流多组分地下水运移概念模型。（2）开发了三维水-气二相渗流模型求解程序，提出了处理水相、气相边界条件的数学处理方法，对降雨入渗过程中气相与水相的相互作用及运移过程进行了重点研究。（3）建立了水-气二相流本构关系模型参数反演识别模型，结合室内非稳定水-气二相流试验确定土样的水-气二相流本构关系。（4）开发了描述海水入侵过程的气-液二相流模型求解程序，提出了人工充气法边界的数学处理方法，对咸-淡水交界面的运移进行了定量研究。上述研究成果有助于揭示地下水多相流系统的物理本质、推求多相流体对之间的本构关系的方法、探索可能的、新型的海水入侵灾害的防治方法。

中文关键词： 地下水；多相流；水-气二相流；降雨入渗；海水入侵

英文摘要： The groundwater system is a multiphase system. The transport of water and contaminants is a very complex process, which involves gas-liquid-solid multiphase flow and transport processes. To estimate the numerical model considering the multiphase flow process is more scientific. The main results of this study are listed as followed: (1) The concepts and properties of multiphase flow system are investigated in detail, then a 3D water-NAPL-gas-energy multiphase multicomponent conceptual model is proposed.(2)The program for solving water-air two-phase flow model was developed. The numerical treatments for the water phase, gas phase and infiltration boundary condition were presented. Then the process of rainfall infiltration was simulated numerically.(3)The inverse parameter estimation method was developed based on Marquart-Levenberg optimization algorithm, which was used to determine the parameters of constitutive relationships in combination with the unsteady outflow experiment. (4)The program for solving the gas-liquid two-phase flow model which used to simulate the process of seawater intrusion was developed. The numerical treatments for the boundary condition of compressed air filling method were presented. The movement of fresh-salt water interface were studied quantitatively.The research results mentioned above will contribute to reveal the physical properties of groundwater system, to determine the constitutive relationship between the liquid couples, and to explore the new measure to the prevention of seawater intrusion.

英文关键词： groundwater; multi-phase flow; water-air two-phase flow; rainfall infiltration; seawater intrusion