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首页> 外文期刊>Soil Science Society of America Journal >Infiltration and Drainage Analysis in a Heterogeneous Soil by Electrical Resistivity Tomography
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Infiltration and Drainage Analysis in a Heterogeneous Soil by Electrical Resistivity Tomography

机译：电阻层析成像在非均质土壤中的入渗和排水分析

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摘要

Petrocalcic horizons are a common feature of soils in many regions. As a result of their presence, the soils acquire a noticeable stratified profile that may severely restrict water infiltration. Therefore, assessing infiltration and drainage becomes a complex task due to the heterogeneous nature of these kind of soils. In the present study, infiltration and drainage were evaluated by means of electrical resistivity tomography (ERT) in a Paleudol soil with a petrocalcic horizon at 90 cm depth. A field infiltration test was performed on an 11.2-m-long transect that was implemented with tensiometers and time domain reflectometry (TDR) probes. Successive measurements using ERT allowed determining resistivity changes as infiltration progressed. Resistivity values were converted into soil water content values by means of functions obtained after laboratory experiments. The soil water contents calculated were validated with the numerical modeling of pressure heads and with TDR water contents. The results showed soil horizon heterogeneities and the behavior of the preferential flow of water. These results further demonstrated the strong control that petrocalcic horizon heterogeneities exert on the water flow at field scale. Less indurated zones favored preferential flow to develop.
机译：石油钙化层位是许多地区土壤的共同特征。由于它们的存在，土壤获得了明显的分层轮廓，这可能严重限制了水的渗透。因此，由于这类土壤的异质性，评估入渗和排水成为一项复杂的任务。在本研究中，通过电阻层析成像（ERT）评估了在岩石深度为90 cm的岩石钙质层的Paleudol土壤中的渗透和排水情况。现场渗透测试是在11.2米长的样条线上进行的，该样条线采用张力计和时域反射仪（TDR）探针实现。使用ERT的连续测量可以确定渗透率随渗透率的变化。通过实验室实验获得的函数将电阻率值转换为土壤含水量。计算的土壤含水量通过压头的数值模拟和TDR含水量进行了验证。结果表明土壤层位非均质性和优先水流行为。这些结果进一步证明了在田间尺度上石油钙质层位非均质性对水流的强烈控制。较少的硬地带有利于优先流动。

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