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Estimation of Hydraulic Conductivity of Soils at a Watershed-Scale Using Porchet’s Method: Application in the Olezoa Waterhed, Yaounde, Cameroon

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International Journal of Geosciences 2016年第3期7卷 397-408页

作者： andré firmin bon Auguste Ombolo Guillaume Ewodo Mboudou Jules Rémy Ndam Ngoupayou Georges Emmanuel Ekodeck Department of Climatology Hydrology and Soil Science Higher Institute of the Sahel University of Maroua Maroua Cameroon Department of Earth Sciences Faculty of Science University of Yaounde I Yaounde Cameroon Department of Hydraulics and Water Control Higher Institute of the Sahel University of Maroua Maroua Cameroon

Contamination analysis of the unsaturated zone requires information on the spatial variability of hydraulic conductivity. Two types of hydraulic tests (variable and constant charge) were identified to estimate the spatial variability of the hydraulic conductivity of the surface portion of the unsaturated zone in the Olezoa watershed. These tests were performed on 100 holes at depths ranging between 50 and 90 cm, spread throughout the watershed. The hydraulic conductivity values obtained at 50 and 90 cm are close to the absolute value for each method. However, they show a difference of 10-1 m/s between the two types of test regardless of the depth of investigation. The representation of data in the graph indicates a staircase quartile distribution for the variable charge test. The test at constant charge, rather presents a log normal distribution which is also supported by the Kolmogorov-Smirnov test. Hydraulic conductivities have a random component and a spatial organization which results from soil and/or morphological factors. This organization thus permits the distinction of zones which could show high pollution risk.

关键词： Unsaturated Zone Quartile Graphs Hydraulic Conductivity Olezoa

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