Lecture.Packet.6.advection.dispersion

Lecture.Packet.6.advection.dispersion - CEE 440 2011...

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Unformatted text preview: CEE 440 2011 Charles J. Werth, University of Illinois at Urbana-Champaign. All rights reserved. 1 CHAPTER 4. SITE PROPERTIES AFFECTING REMEDIATION My teaching goals for this chapter are for you to: 1) learn how site specific properties affect contaminant transport in soil and groundwater 2) Derive the advection-dispersion equation 3) Calculate travel times for contaminants in groundwater based on relevant hydraulic properties 4) Evaluate how dispersion processes dilute contaminants in groundwater CEE 440 2011 Charles J. Werth, University of Illinois at Urbana-Champaign. All rights reserved. 2 TRANSPORT PROPERTIES: ADVECTION, DISPERSION, AND SORPTION Transport properties refer to all of the factors that influence the movement of contaminants in the subsurface. The physics of transport are a function of what phase the contaminants are in. In CEE440 we will focus primarily on aqueous and vapor phase transport. Transport of pure phase chemicals is a complex problem that is best left to a course which focuses on multiphase flow. In CEE440 we will derive partial differential equations that describe the processes which affect transport. Analytical solutions to these equations will be provided for you. You will work with these solutions to evaluate CEE 440 2011 Charles J. Werth, University of Illinois at Urbana-Champaign. All rights reserved. 2 TRANSPORT PROPERTIES: ADVECTION, DISPERSION, AND SORPTION Transport properties refer to all of the factors that influence the movement of contaminants in the subsurface. The physics of transport are a function of what phase the contaminants are in. In CEE440 we will focus primarily on aqueous and vapor phase transport. Transport of pure phase chemicals is a complex problem that is best left to a course which focuses on multiphase flow. In CEE440 we will derive partial differential equations that describe the processes which affect transport. Analytical solutions to these equations will be provided for you. You will work with these solutions to evaluate how subsurface parameter affects contaminant transport. CEE 440 2011 Charles J. Werth, University of Illinois at Urbana-Champaign. All rights reserved. 3 Geologic/Hydrogeologic Heterogeneity An extremely important factor that we will only consider qualitatively is heterogeneity. Heterogeneity exists at all scales (i.e. at both the pore and the Darcy scale) and results in highly variable contaminant distributions in the subsurface. Heterogeneity is one of the biggest obstacles facing Environmental Remediation and the focus of much current research (including mine). TILL BEDROCK SAND AND GRAVEL FRACTURED ROCK LOW PERMEABILITY CLAY & SILT Figure 4.1. Illustration of subsurface heterogeneity CEE 440 2011 Charles J. Werth, University of Illinois at Urbana-Champaign. All rights reserved. 4 A couple of definitions: Water table - surface along which all pores are filled with water at atmospheric pressure Aquifer- porous medium capable of storing water and transport substantial...
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This note was uploaded on 09/30/2011 for the course CEE 440 taught by Professor Werth,c during the Spring '08 term at University of Illinois, Urbana Champaign.

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Lecture.Packet.6.advection.dispersion - CEE 440 2011...

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