Contaminated Ground Water and Sediment: Modeling for by Calvin C. Chien, Miguel A. Medina Jr., George F. Pinder,

By Calvin C. Chien, Miguel A. Medina Jr., George F. Pinder, Danny D. Reible, Brent Sleep, Chunmiao Zheng

This booklet is the documented results of a workshop, Modeling and administration of rising Environmental matters, held at Penn kingdom college. This occasion assembled modeling specialists from the U.S. and Canada to debate modeling expertise improvement and alertness, on the way to advertise sound and reasonable environmental decision-making. This thorough research presents environmental engineers, hydrologists, and others with an outline at the cutting-edge in present perform and identifies rising examine and improvement developments inside modeling expertise. all the discussions considers not just technical concerns, yet regulatory and value components to boot.

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Extra info for Contaminated Ground Water and Sediment: Modeling for Management and Remediation

Example text

Other examples besides CORMIX include the hydrodynamic-eutrophication model (HEM-3D) developed by Park et al. (1995) and the hydrodynamic and sediment transport model EFDC (Hamrick, 1992, 1996). In essence, HEM-3D is an integration of a water quality model with 21 state variables and the EFDC. , dissolved oxygen, suspended algae, carbon, nitrogen, phosphorus and silica cycles, coliform bacteria). Upon receiving the particulate organic matter deposited from the overlying water column, a sediment process model (also with 21 state variables) simulates their diagenesis and the resulting ßuxes of inorganic substances and sediment oxygen demand back to the water column.

Thus, the hyporheic zone can subject contaminants to transformation processes that cannot occur elsewhere in the stream–aquifer system (Nagorski and Moore, 1999). In some cases, these hyporheic processes can be highly beneÞcial, for example, by offering the opportunity for naturally enhanced in situ bioremediation of reduced, organic-rich plumes discharging to streams (Hynes, 1983; USEPA, 2000). When a reduced, organic-rich plume discharges to a stream, the hyporheic zone can thus provide a region of natural aerobic bioremediation.

These studies range from models based on very simple, one-dimensional analytical (closed form) solutions that assume a completely homogeneous and isotropic ßuid (or porous medium in the case of subsurface models) to complex, three-dimensional numerical codes that allow for complete speciÞcation of ßow and contaminant characteristics throughout a three-dimensional grid. Other examples besides CORMIX include the hydrodynamic-eutrophication model (HEM-3D) developed by Park et al. (1995) and the hydrodynamic and sediment transport model EFDC (Hamrick, 1992, 1996).

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