Simultaneous Water Content, Air-Filled Porosity, and Bulk Density Measurements with Thermo-Time Domain Reflectometry
Simultaneous Water Content, Air-Filled Porosity, and Bulk Density Measurements with Thermo-Time Domain Reflectometry
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DOI：
10.2136/sssaj2001.1618
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发表时间：
2001-11
影响因子：
2.9
通讯作者：
T. Ochsner;R. Horton;T. Ren
中科院分区：
文献类型：
--
作者：
T. Ochsner;R. Horton;T. Ren
在实验室土芯中挖掘固体和水的三维分布（Phogat等人，1991年，RoThe partitionation of the soil volume between water，solids，and air gasik et al.，1999年）。这些技术的应用强烈地影响许多土壤过程。在本文中，我们展示了一种新的方法来非破坏性地测量这种划分。仅限于实验室设置，并进一步受到热时域反射仪（thermo-TDR）探头插入的限制，无法进入设备。curinto桑迪壤土和用于应用热和电磁租金技术的局限性产生了对脉冲的新技术的需求，并监测这些脉冲通过土壤的传输。我们用所得的数据来确定土壤的含水量、空气-水、固体和空气。填充孔隙度，固体体积分数，以及我们的新技术，用于确定的程度，vs，饱和度和体积密度。当针对这种土壤进行校准时，土壤中空气的标准体积分数（na）来自热TDR测量和重量测量之间的独特误差-两种广泛接受的理论的组合。初始含水量分别为0.02、0.07和0.05m3m3。体积理论认为系统的热物性分别为固体分数和空气孔隙率。饱和度的标准与各组分的体积分数有关，体积密度的标准与各组分的体积分数有关，饱和度的标准与各组分的体积分数有关，体积密度的标准与各组分的体积分数有关，体积密度的标准与各组分的体积分数有关
mine the three-dimensional distribution of solids and water in laboratory soil cores (Phogat et al., 1991, RoThe partitioning of the soil volume between water, solids, and air gasik et al., 1999). Applications of these techniques are strongly influences many soil processes. In this paper we demonstrate a new approach to nondestructively measure this partitioning. A limited to laboratory settings and are further limited by thermo-time domain reflectometry (thermo-TDR) probe was inserted lack of access to the equipment. The limitations of curinto sandy loam soil and used to apply thermal and electromagnetic rent techniques create a need for new techniques to pulses and to monitor the transport of these pulses through the soil. measure the partitioning of the soil volume between We used the resulting data to determine the soil water content, air- water, solids, and air. filled porosity, and volume fraction of solids, as well as degree of Our new technique for determining the , vs, and the saturation and bulk density. When calibrated for this soil, the standard volume fraction of air in soil (na) follows from a unique errors between thermo-TDR measurements and gravimetric measure- combination of two widely accepted theories. The first ments were 0.02, 0.07, and 0.05 m 3 m 3 for water content, volume theory is that the thermal properties of a system are fraction of solids, and air-filled porosity, respectively. The standard related to the volume fractions of the individual compoerror for degree of saturation was 0.08 m 3 m 3 , and for bulk density