鸡场土壤渗孔系数的地电法评价

F. M. Alani, Abidoye L. Kolawole, A. O. Olalekan, Olatona G. Ismail
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引用次数: 0

摘要

当土壤和岩石存在多孔性时,在死鸟处置坑底部收集的渗滤液可能会泄漏并迁移到污染地下水中。本研究采用二维电阻率法和土壤分析法对禽田土壤和岩石的渗透系数(K)和孔隙度(Ф)进行了评价。利用偶极-偶极阵列实现地电数据采集。沿东西方向的3条100 m的导线(3条剖面)进行了场电阻率测量。这些测量以偏移距离5米为间隔,依次递增。利用DIPPROWIN建模软件对获取的视电阻率数据进行反演,进行二维数据反演。在家禽养殖场0 ~ 15 cm和15 ~ 30 cm的不同位置采集、运输和实验室检测5个土壤样品。K和Ф分别采用落头法和密度法测定。对3条剖面的场电阻率数据进行处理,得到现场数据伪剖面、理论伪剖面和二维电阻率结构。二维电阻率结构揭示了三个结构:高导电性、微导电性和电阻性。这些结构的电阻率值分别为14.1 ~ 99.0 Ω m、100 ~ 848 Ω m和1350 ~ 90330 Ω m。在剖面1和剖面3中发现了高导电性结构,这是由于来自死鸟处置坑1和粪便处置场的污染物通过粘土砂土向下迁移所致。这种情况发生在距离地表几米到20米以上的深度范围内。微导电结构的存在是土壤材料过滤污染物的结果,这增加了土壤的电阻率。污染物在土壤中的运动表明了农田的多孔性和渗透性。电阻结构仅在剖面1和剖面2中明显,但在剖面长度的5 m至20 m以上和5 m至35 m深度范围内非常突出。结果表明,5个禽田土壤样品的孔隙度(Ф)和渗透系数(K)分别为0.552和3.554 × 10−2cm/s。Ф与K之间存在R2 = 0.9878的强相关关系,因此地电法成功地评价了禽田土壤Ф与K。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geo-Electrical Method of Assessment of Coefficient of Permeability and Porosity of Soil of a Poultry Farmland
Abstract Leachate collected at the bottom of dead bird’s disposal pits may leak and migrate to pollute groundwater when soils and rocks present are porous. This study assessed the coefficient of permeability (K) and porosity (Ф) of soils and rocks in poultry farmland using 2 Dimensional (2D) electrical resistivity method and soil analysis. Geo-electrical data collection was achieved by using the dipole-dipole array. The field resistivity measurement was carried out along three traverse lines (three Profiles) of 100 m long which were oriented along with East-West directions. These measurements were taken in the order of increasing in offset distance interval of 5 m. The acquired apparent resistivity data were inverted using DIPPROWIN modeling software to perform 2D data inversion. Five soil samples from different locations at depths of 0 – 15 cm and 15 – 30 cm, on the poultry farmland, were collected, transported, and tested in the laboratory. K and Ф were determined using falling head and density methods respectively. The results obtained from the processed field resistivity data from the three profiles were presented as field data pseudo-sections, theoretical pseudo-section, and 2D resistivity structures. The 2D resistivity structure revealed three structures viz; highly conductive, slightly conductive, and resistive. The resistivity values of these structures ranged from 14.1-99.0 Ω m, 100-848 Ω m, and 1350-90330 Ω m respectively. The highly conductive structures were found in profiles 1 and 3 due to the downward migration of the contaminants from the dead bird disposal pit 1 and the feces disposal site through clayey sand soil. This occurs at the depth range of few meters from the surface to greater than 20 m. The presence of the slightly conductive structure is a result of filtration of the contaminants by the soil materials which increased the resistivity of the soil. The movement of the contaminant through the soil is an indication of the porous and permeable nature of the farmland. The resistive structure is only noticeable in profiles 1 and 2 but very prominent at the depth range of 5 m to more than 20 m and 5 m to 35 m along the profile length. The results of the analysis of the five soil samples from the poultry farmland showed a high value of 0.552 and 3.554 x 10−2cm/s of porosity (Ф) and coefficient of permeability (K) respectively. A strong correlation of R2 = 0.9878 existed between Ф and K. With these results geo-electrical method had successfully assessed Ф and K of the soil of the poultry farmland.
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