Hydrodynamic characterization of soil compaction using integrated electrical resistivity and X‐ray computed tomography
Hydrodynamic characterization of soil compaction using integrated electrical resistivity and X‐ray computed tomography
复制标题
使用集成电阻率和 X 射线计算机断层扫描对土壤压实进行水动力表征
作者：
M. Cimpoiasu;O. Kuras;P. Wilkinson;T. Pridmore;S. Mooney
现代农业做法可能对土壤造成重大压力，最终产生退化效应，如压实。迫切需要快速，非侵入性的方法来表征和监测压实及其对水力过程的影响。电阻率层析成像（ERT）是一种用于评估土壤水力特性的成熟方法，因为它具有高时间分辨率和对水分含量和盐度变化的敏感性，而X射线计算机断层成像（CT）可用于土壤结构的高空间分辨率成像。我们使用这两种方法的组合强度来研究三种不同压实度下的土壤。在土壤表面施加盐溶液后，对土壤进行X射线扫描和电气监测。扫描揭示了孔隙网络结构，并使我们能够计算其大小和连通性。ERT模型揭示了抑制渗透率的土壤具有较低的容重，但也如何电阻率的变化是时空分布在土柱。此外，我们获得了两种方法之间的定量联系，通过这种方法，孔隙密度更高的体素与电阻率的时间变化相关。在此基础上，我们建立了渗流过程中孔隙结构和溶液分布之间的空间配置。这表明了两种层析成像方法的组合优势的潜力，以获得土壤水动力学特性的增强表征。
Modern agricultural practices can cause significant stress on soil, which ultimately has degrading effects, such as compaction. There is an urgent need for fast, noninvasive methods to characterize and monitor compaction and its impact on hydraulic processes. Electrical resistivity tomography (ERT) is a well‐established method used for the assessment of soil hydraulic properties due to its high temporal resolution and sensitivity to changes in moisture content and salinity, whereas X‐ray computed tomography (CT) can be used for high‐spatial‐resolution imaging of soil structure. We used the combined strengths of both methods to study soil under three different levels of compaction. The soils were X‐ray scanned and electrically monitored after the application of a saline solution to the soil surface. The scans revealed the pore network architecture and allowed us to compute its size and connectivity. The ERT models revealed inhibited percolation rates for soils with a lower bulk density, but also how resistivity changes are spatiotemporally distributed within the soil columns. Furthermore, we obtained a quantitative link between the two methods, by which voxels more densely populated with pores were associated with higher temporal variations in electrical resistivity. Building on this, we established a spatial collocation between pore structure and distribution of solution during percolation. This demonstrates the potential of the combined strengths of the two tomographic methods to obtain an enhanced characterization of soil hydrodynamic properties.
X 射线计算机断层扫描与电阻率数据之间的土壤物理关系
影响因子：
1
作者：
Cimpoiasu M
通讯作者：
Cimpoiasu M
影响因子：
2
作者：
Loke, M. H.;Chambers, J. E.;Wilkinson, P. B.
通讯作者：
Wilkinson, P. B.