Correlation Of Hydraulic Conductivity Research Articles

Correlation between low-order probability distribution functions and percolation of porous concrete

Concrete is a multi-phase material whose material properties are strongly affected by phase distribution. It is important to identify the spatial distribution of voids in concrete because voids have a significant effect on mechanical behaviour and percolation. Therefore, a proper method to describe the void distribution of the material is needed. This paper describes how computed tomography (CT) was used to examine and quantify the void distribution of porous concrete specimens. Virtual three-dimensional porous concrete specimens were created using CT. Then, low-order probability distribution functions such as two-point correlation, lineal-path and two-point cluster functions were used to characterise the void distribution. Based on CT image analysis, the correlation of hydraulic conductivity between experiment results and probability distribution functions of porous concrete is examined. It is confirmed that low-order probability functions and percolation of porous concrete are correlated and that the low-order probability functions are efficient and effective in describing percolation within porous concrete.

Geostatistic Approaches for Investigating of Soil Hydraulic Conductivity in Shahrekord Plain, Iran

So il hydraulic conductivity is the most important physical parameter that impresses drainage projects fro m technical perspective. The purpose of this study is the investigation of spatial changes of hydraulic conductivity, calibration, and feasibility of using various methods of geostatistic in Shahrekord Plain in the West of Iran. Hence Kriging (K), Inverse Distance Weighting method (IDW), Local Po lynomial Interpolation (LPI) and Global Polyno mial Interpolation (GPI) methods were used for interpolation. For evaluation these methods we used Cross-Validation Technique with MAE and M BE statistical criteria. Studies showed that spatial correlat ion of hydraulic conductivity in this region is weak and krig ing was recognized as suitable method (C0/Sill = 81%). Ordinary kriging method contains the lowest rate of MAE and MBE. In fact, the high flexib ility of this method than the other methods studied shows the high accuracy of this method because of having variety models and parameters. Also results showed that ordinary kriging with a circular model are the most suitable method for interpolation in zoning the hydraulic conductivity because of lower errors and relative deviation.

Correlation of hydraulic conductivity with stratigraphy in a fractured-dolomite aquifer, northeastern Wisconsin, USA

This study integrated surface and subsurface stratigraphic data with geophysical logs and hydrogeologic data in order to characterize the hydraulic properties of the Silurian dolomite in northeastern Wisconsin. Silurian stratigraphy consists of predictable alternations of characteristic facies associations. A vertical profile of hydraulic conductivity, obtained from short-interval packer tests in a core hole that penetrates a majority of the Silurian section, indicates that hydraulic conductivity ranges over five orders of magnitude (10–1 to 10–6 cm/s). Matrix conductivity is generally low and varies with texture; the finer-grained restricted-marine and transitional facies being less permeable than the coarser-grained open-marine facies. High-conductivity values are generally associated with bedding-plane fractures, and fracture frequency is greater in the restricted-marine facies.