台伯河(意大利中部)非饱和沙质土含水量及水力特性估算:PR2/6探针与水力特性估算器数据整合

IF 0.8 Q4 WATER RESOURCES
Sofia Ortenzi, Martina Mangoni, L. Di Matteo
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引用次数: 2

摘要

土壤水分数据的正确估算是土壤水分管理和非饱和土水力特性估算的基础。多传感器电容探头(mcap)的使用越来越多,需要仔细校准。如果没有准确的校准,使用mcap会导致不正确的含水量估计,使它们没有实际用途。本文提出了PR2/6型探头在不同性质的砂粒上正确使用的具体校准方程。随着台伯河流域砂中氧化铁含量的增加,校准线斜率增加,从而可以了解不同的电磁响应。在世界范围内的其他砂中,氧化铁含量高的砂比石英砂或钙质砂具有更高的比表面积,因为石英砂或钙质砂具有更多的粘性水(例如,高介电常数值)。含水量数据与水力特性估计器相结合,可以估计土壤的水力导电性。采用PR2/6型轮廓探头的制造商方程而不是具体方程会导致对水力导率值的高估高达两个数量级,从而使对非饱和区发生的现象的理解相当不正确。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimating moisture content and hydraulic properties of unsaturated sandy soils of Tiber River (Central Italy): integrating data from calibrated PR2/6 probe and hydraulic property estimator
The correct estimation of soil moisture data is essential in soil-water management and estimating the hydraulic properties of unsaturated soils. The increased use of Multi-Sensor Capacitance Probes (MCAPs) requires careful calibration. Without accurate calibration, the use of MCAPs leads to incorrect water content estimation, making them of no practical use. This work presents the specific calibration equations for the correct use of the PR2/6 profile probe on sands of different nature. As the iron oxides content of the Tiber River basin sands increases, the calibration lines slope increases, allowing the understanding of the different electromagnetic responses. As for other sands worldwide, sands with high iron oxides content show a relative high specific surface than quartz or calcareous sands, responsible for more adhesive water (e.g., high permittivity values). The water content data are integrated with a hydraulic property estimator allowing the estimation of the hydraulic conductivity of soils. Applying the manufacturer equation of the PR2/6 profile probe instead of the specific equation leads to an overestimation of the hydraulic conductivity values up to two orders of magnitude, making therefore rather incorrect the understanding of the phenomena occurring in the unsaturated zone.
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来源期刊
CiteScore
1.80
自引率
50.00%
发文量
36
审稿时长
8 weeks
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