Contaminant transport and biodegradation in saturated porous media: model development and simulation

2005 ◽  
Vol 19 (20) ◽  
pp. 4069-4079 ◽  
Author(s):  
Song-Bae Kim
Keyword(s):  
Porous Media ◽  
Contaminant Transport ◽  
Model Development ◽  
Saturated Porous Media ◽  
Porous Media Model

An experimentally-validated framework for interpreting active-DTS measurements conducted in fully saturated porous media

2021 ◽  
Author(s):  
Nataline Simon ◽  
Olivier Bour ◽  
Nicolas Lavenant ◽  
Gilles Porel ◽  
Benoît Nauleau ◽  
...  
Keyword(s):  
Porous Media ◽  
Contaminant Transport ◽  
Temperature Increase ◽  
Saturated Porous Media ◽  
Distributed Temperature Sensing ◽  
Groundwater Flux ◽  
Wide Range ◽  
Independent Experimental Data ◽  
Theoretical Developments ◽  
Thermal Conductivities

<p>            Our ability to characterize aquifers, predict contaminant transport and understand biogeochemical reactions occurring in the subsurface directly depends on our ability of characterizing the distribution of groundwater flow. In this context, recently-developed active-Distributed Temperature Sensing (DTS) experiments are particularly promising, offering the possibility to characterize groundwater flows resulting from heterogeneous flow fields. Here, based on theoretical developments and numerical simulations, we propose a general framework for estimating active-DTS measurements, which can be easily applied and takes into account the spatial distribution of the thermal conductivities of sediments.</p><p>            Two independent methods for interpreting active-DTS experiments are proposed to estimate both the porous media thermal conductivities and the groundwater fluxes in sediments. These methods rely on the interpretation of the temperature increase measured along a single heated fiber optic (FO) cable and consider heat transfer processes occurring both through the FO cable itself and through the porous media. In order to validate these interpretation methods with independent experimental data, active-DTS measurements were collected under different flow-conditions during laboratory tests in a sandbox. First, the combination of a numerical model with laboratory experiments allowed improving the understanding of the thermal processes controlling the temperature increase. Then, the two complementary and independent interpretation methods providing an estimate of both the thermal conductivity and the groundwater flux were fully validated and the excellent accuracy of groundwater flux estimates (< 5%) was demonstrated.</p><p>            Our results suggest that active-DTS experiments allow investigating groundwater fluxes over a large range spanning 1x10<sup>-6</sup> to 5x10<sup>-2</sup> m/s, depending on the duration of the experiment. The active-DTS method could thus be potentially applied to a very wide range of flow systems since groundwater fluxes can be investigated over more than three orders of magnitude. In the field, the reliable and direct estimation of the distribution of fluxes could replace the measurement of hydraulic conductivity, whose distribution and variability still remains difficult and time consuming to evaluate.</p>

Combined Fracture/Porous Media Model for Contaminant Transport

1981 ◽  
Vol 5 (6) ◽  
pp. 376-380 ◽  
Author(s):  
H.E. Nuttall ◽  
A.K. Ray
Keyword(s):  
Porous Media ◽  
Contaminant Transport ◽  
Porous Media Model

Porous Media Modeling with Integrated Approach and Application in Water Flow Simulation

2010 ◽  
Vol 34-35 ◽  
pp. 717-721 ◽  
Author(s):  
Yue Liang ◽  
Liang Chen ◽  
Xiao Lu Yan
Keyword(s):  
Porous Media ◽  
Contaminant Transport ◽  
Flow Simulation ◽  
Integrated Approach ◽  
Mechanical Analysis ◽  
Porous Media Model ◽  
Model Size ◽  
Volume Method ◽  
Machinery Manufacturing ◽  
Computing Simulation

The porous media for liquid transporting and mechanical analysis, which are the hotspot studies in contaminant transport and machinery manufacturing, is hard to model in the computing simulation for the complexity of the media’s porosity. In the paper, an integrated approach is proposed to model the porous media with the framework of but not limited to sphere particles. Firstly, a series of particles are generated according to the grading curve in a closed box with the PFC3D, and then let the particles deposit freely for the gravity. After that the position and radium of each particle are exported to a file for import of AUTOCAD, where the particles are re-generated by the VBA script and the model for particles is constructed. The needed model is the porosity among the particles, so the model size is determined by a block and the model is gotten with the Boolean Operation which subtracts the particles from the block. And then with the different boundaries, the water transporting simulation in the porous media model is carried out with the Finite Volume Method (FVM). The results are proved reasonable by the previous studies.

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