Analytical modelling as a basis for monitored ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Analytical modelling as a basis for monitored natural attenuation studies
Author:M. Gutierrez-Neri (Utrecht University, Holland)
P.A.S. Ham (Utrecht University, Holland)
R.J. Schotting (Utrecht University, Holland)
D.N. Lerner (Sheffield University, UK)
Presenter:M. Gutierrez-Neri (Utrecht University, Holland)
Date: 2006-06-18     Track: Main     Session: 1

In this paper, an analytical approach to modelling coupled fringe and core degradation of a contaminant plume is presented. Explicit steady-state solutions are derived in three dimensions using a well-known analytical solution for a continuous planar source problem. These solutions provide rapid methods to evaluate the risk of subsurface pollution by contaminated groundwater plumes at field sites, particulary in terms of maximum potential plume length. The resulting fringe-core degradation model suggests the controlling parameters of natural attenuation are (i) the size of the contaminant source, (ii) electron acceptop to electron donor ratio, (iii) transverse dispersivities and (iv) a term (a/v). The latter term provides a simple check on the relative weights of transport to core degradation and can be used to estimate the importance of core degradation in the overall plume attenuation. The developed method is applied to data from a well-known field site to demonstrate its applicability in MNA studies where both fringe and core degradation occur. Results demonstrate that only through the consideration of both of these degradation processes, can the maximum length of the steady-state plume be better approximated.