Use of a Combined Penetrometer–Moisture Probe Together with Geophysical Methods to Survey Hydrological Properties of a Natural Slope
Use of a Combined Penetrometer–Moisture Probe Together with Geophysical Methods to Survey Hydrological Properties of a Natural Slope
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DOI：
10.2136/vzj2010.0012
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发表时间：
2010-08
影响因子：
2.8
通讯作者：
Y. Yamakawa;K. Kosugi;N. Masaoka;Y. Tada;T. Mizuyama
中科院分区：
文献类型：
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作者：
Y. Yamakawa;K. Kosugi;N. Masaoka;Y. Tada;T. Mizuyama
新开发的组合式贯入仪-湿度探头（CPMP）与两种传统的地球物理方法，电阻率成像（ERI）和探地雷达（GPR）一起，用于确定花岗岩基岩下森林斜坡的土壤深度、土壤类型和水分分布。使用 CPMP 测量的体积含水量 (θ) 剖面准确地描绘了地下水位上方沙质层、壤质层和砾石层的交替。在大多数情况下，由于干燥表层土壤和轻度风化基岩的电阻率之间存在高度反差，因此 ERI 能够成功检测到土壤-基岩界面。在某些地区，土壤-基岩界面因孔隙水或严重风化的基岩而被遮蔽。尽管使用 CPMP 直接测量的 θ 与使用 ERI 测量的电阻率 (ρ) 估计的 θ 之间具有良好的匹配性，但在检测由沙土、壤土和砾石土层交替引起的不均匀 θ 分布方面，CPMP 比 ERI 更准确。结合使用 CPMP 和 ERI 可有效量化森林斜坡上的土壤深度、土壤材质和含水量分布。尽管在所研究的森林斜坡上使用探地雷达未能成功检测土壤厚度、分布和地下水深度，但通过使用同一地点同时获得的 CPMP 数据校准探地雷达数据，可能可以实现土壤厚度和地下水位的定量估计。
A newly developed, combined penetrometer–moisture probe (CPMP), together with two conventional geophysical methods, electrical resistivity imaging (ERI) and ground‐penetrating radar (GPR), was used to determine soil depth, soil type, and water distribution of a forested slope underlain by granitic bedrock. Profiles of volumetric water content (θ) measured using the CPMP accurately depicted alternations of sandy, loamy, and gravelly layers above the water table. In most cases soil–bedrock interfaces were successfully detected by ERI because of the high contrast between the electrical resistivity of dry surface soil and lightly weathered bedrock. In some areas, the soil–bedrock interface was obscured by the presence of pore water or by heavily weathered bedrock. Although a good match was obtained between θ, as directly measured using the CPMP, and θ estimated from electrical resistivity (ρ), as measured with ERI, the CPMP was more accurate than ERI for detecting heterogeneous θ distributions caused by alternations of sandy, loamy, and gravelly soil layers. Using the CPMP and ERI together is effective in quantifying soil depth, soil material, and water content distribution on a forested slope. Although soil thickness, distribution, and groundwater depth were not successfully detected using GPR on the forested slope studied, it may be possible to achieve quantitative estimates of the soil thickness and water table by calibrating GPR data with CPMP data obtained from the same locality at the same time.