394804 - Characteristics of Solute Transport Processes in Dead-End Pores
Thursday, June 7
10:30 AM - 12:00 PM
Location: Lakeshore B
Sina Sadeghi, Northridge, CA – CSUN; André Ketchedjian, Northridge, CA – CSUN
Water flows in the subsurface through interconnected voids within porous media. However, the presence of dead-end pores makes water flow quite difficult. The exchange processes between the waters in the tortuous movement path of porous media and those in areas where dead-end pores are present become influenced as well. This may affect the fate and transport of solute traveling through void space and dead-end pores, and may worsen the quality of groundwater.
Understanding the characteristics of solute transport processes in dead-end pores is required to properly plan subsurface cleanup and to adequately manage groundwater quality. A method that determines these influences is developed. It is represented as a random walk problem where the constituent or contaminant is simulated by starting a “particle” cloud that moves with the flow of movement path. This cloud is then superimposed by a random movement in the transverse direction of the finite volume (dead-end pore), representing the diffusion. The method is validated by comparing the results determined by simulations with solutions to the advection-diffusion equation. It is concluded that the transverse distribution of solute material is influenced by the presence of dead-end pores.