Analysis of the relation between change of soil water phase and salt concentration by the measurement of dielectric constant in high frequency

高频介电常数测量分析土壤水相变化与盐浓度的关系

基本信息

批准号：
08660295
负责人：
MITSUNO Toru
金额：
$ 1.47万
依托单位：
KYOTO UNIVERSITY (1998)Okayama University (1996-1997)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Some interesting phenomena occur on the interface between different materials. In this study, the phenomena at the freezing front, that is a interface between frozen and unfrozen soil, are investigated for a saline soil on the view point of an electromagnetic phenomena.By the laboratory experiment for soil column, it is certified that much sensible heat occurs at the freezing front, is transferred through the frozen soil layer to the surface, and is released to the atmosphere. At the same time, it becomes clear that the soil water in liquid phase moves to the freezing front, and the soluble salt moves accompanied with the soil water to be accumulated there. By the measurement of dielectric constant of soil, it is recognized that much unfrozen water exists below 00C under the high salt concentration.The new technique to measure the depth of the interface between different soils is developed based on that the electromagnetic signal conducting in metal rod buried into soil reflects at the interface. The freezing front, that is, the interface between frozen and unfrozen soil, is precisely measured by this technique.The soil freezing phenomena are very complicated because heat, water and other materials are moved simultaneously by the soil frost. Some dynamic phenomena are, therefore, observed near the freezing front. The movement of the freezing front is investigated, and then the equation of the proceeding and receding of the front is derived and certified to predict well the movement of the front by the numerical simulation.

不同材料之间的界面上发生了一些有趣的现象。在这项研究中，研究了冰冻和未冻结土壤之间的界面的现象，在电磁现象的角度研究了盐水土壤的界面。通过土壤柱的实验室实验，它被证明是在冰点上通过冰冻的土壤层转移到表面，并释放到氛围中，并释放了冰冻的土壤，并释放出了冰冻的热量。同时，很明显，液相的土壤水移至冰点前面，可溶性盐移动与土壤水相伴有在那里积聚。通过测量土壤的介电常数，人们认识到，在高盐浓度下，00c低于00c的水。测量不同土壤之间界面深度的新技术是基于埋入土壤中的金属杆中的电磁信号在界面上反映在土壤中的金属杆的电磁信号。冻结的前面，即冷冻和未冻结的土壤之间的界面，是通过这种技术来衡量的。土壤冷冻现象非常复杂，因为热，水和其他材料通过土壤霜同时移动。因此，在冰冻前部附近观察到了一些动态现象。研究了冰点前沿的运动，然后得出并认证了前部的程序和退缩的方程，以通过数值模拟很好地预测前部的运动。