Scott A. Bradford

TL;DR: Numerical experiments conducted on a 2D-axisymmetric domain using the HYDRUS (2D/3D) software to systematically study the influence of various homogenous soil types and subsurface heterogeneity on recharge from drywells under constant head conditions indicated that recharge for a heterogeneous profile cannot be estimated with an equivalent homogeneous profile.

TL;DR: The surface element integration technique was used to systematically study Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energies/forces between hollow spherical particles (HPs) and a planar surface or two intercepting half planes under different ionic strength conditions, resulting in directional bonds between PHPs and the formation of aggregates with contact points of the primary PHPs facing outward.

TL;DR: The AFM examinations confirmed that the adhesive forces were enhanced and reduced at concave and convex locations of sand surfaces, respectively, which have important implications for surface cleaning and prediction of the transport and fate of hazardous colloids and colloid-associated contaminants in subsurface environments.

TL;DR: Results reveal the underlying causes (interaction energy, torque balance, and residence time) of the velocity dependency of E. coli retention and release parameters that are not accounted for in colloid filtration theory.

TL;DR: The objective was to use a straightforward procedure, based on variable transformation and Laplace transform, to solve the problem of advective colloid transport with irreversible retention and Langmuirian blocking for a pulse-type condition.