Conceptual and mathematical modeling of the Hanford groundwater flow regime

Abstract

Disposal of radioactive wastes to surface disposal sites at the Hanford Atomic Reservation has resulted in some radioactive and chemical contamination of the underlying groundwater flow systems. In support of the Hanford groundwater management effort a preliminary conceptual model of the groundwater system has been formulated as a first step in understanding possible contaminant movement. The mathematical modeling capabilities needed for better understanding and prediction of such contaminant movement are discussed in this paper and the state-of-the-art in groundwater modeling as related to Hanford is summarized with emphasis upon computer solution methods. An inventory of potentially applicable codes available both at Hanford and elsewhere is included. The areas where groundwater modeling capability is lacking are outlined, and the steps needed to overcome such deficiencies are discussed.