Synopses & Reviews
Original publisher: Washington, DC: Division of Systems Analysis and Regulatory Effectiveness, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 2005. OCLC Number: (OCoLC)243705337 Subject: Groundwater flow -- Computer simulation. Excerpt: ...1. INTRODUCTION separate gas phases. Any of the reactions The fate and transport of chemicals such as can be specified as either rate or equilibrium radionuclides in groundwater aquifers is controlled. The reaction rates can be affected by both the flow of ground water represented by a wide array of reaction rate and by geochemical reactions. Computer laws including variable order kinetics, mass models are often used to simulate the action or ' Transition State Theory ' kinetics, reactive transport of radionuclides in Monod kinetics, and user defined rate laws. groundwater in order to predict future Thus, RATEQ replaces the simple reaction concentrations and subsequently the dose. package available in MT3DMS with a fairly These computer models therefore must general geochemical reactions package. A simulate the groundwater flow which key advantage of RATEQ is that accounts for fluid sources and sinks and multicomponent geochemical reactions can changes of storage within the aquifer. In by added to a groundwater flow model addition, the models must simulate the implemented using MODFLOW-2000. effects of advection, dispersion, diffusion Simple one dimensional simulations can and geochemical reactions on radionuclide also be conducted independently of transport. MODFLOW-2000. MODFLOW-2000 ( Harbaugh et al., 2000 ) is one of the most widely used models for 1.1 Model Overview simulating groundwater flow. This model is capable of simulating transient or steady This section briefly summarizes the input to state flow in three dimensional confined or the model, options for producing model unconfined aquifers. MODFLOW-2000 output, and describes the applicability and ( Harbaugh et al., 2000 ) is applicable ...