Applied Hydrogeophysics (Nato Science Series: IV: Earth and by Harry Vereecken, Andrew Binley, Giorgio Cassiani, André

By Harry Vereecken, Andrew Binley, Giorgio Cassiani, André Revil, Konstantin Titov

This publication makes a speciality of the the applying of hydrogeophysical how to the certainty of hydrological strategies and environmental difficulties facing the movement of water and the delivery of solutes and contaminants. Taking a process-driven method, the publication deals a chain of process-driven chapters, every one authored by means of major specialists. parts coated contain: infiltration and solute shipping procedures, biogeochemical functioning of soil-water structures, coastal groundwater interactions, chilly sector hydrology, engineered obstacles and landfill procedures.

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It is evident that with the help of high-resolution GPR tomograms, the measurements of extractable Fe(II) and Fe(III) as well as lithofacies measurements can be extended to locations where direct measurements are not available. For details, see Chen et al. (2004). 4. DISCUSSION OF INTEGRATION METHODS Integration methods are relatively easy to implement because geophysical inversion and hydrogeological data processing are carried out separately. Furthermore, they rely on well-established techniques to integrate different types of data.

Within the model, lithofacies and Fe(II) and Fe(III) concentrations at each pixel between the boreholes were considered as random variables. The borehole lithofacies measurements and crosshole GPR tomograms (Figure 3a) were considered as independent parameters. By conditioning all the unknowns to the available datasets, a joint posterior probability distribution function of those variables was defined at each location. Using a Markov chain Monte Carlo (MCMC) method, many samples of each unknown were obtained, which were subsequently used to calculate mean, variance, and predictive intervals for each unknown variable.

The choice of the appropriate hydrogeophysical parameter estimation approach largely depends on the problem. Each method is based on assumptions, which should be acknowledged and examined. No method is good for all applications at the current stage. There is much room to improve our current methods as hydrogeophysics is a new and interdisciplinary field. In this chapter, we have discussed choices that must be made in hydrogeophysical parameter estimation. We have also attempted to classify hydrogeophysical parameter estimation into three classes: direct mapping; integration methods, and joint inversion methods.

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