Introduction 1 Purpose and scope 2 Previous studies 2 Acknowledgments 2 Approach 4 Digital modeling techniques 5 INTERA deep well waste disposal model 5 Hydrodynamic dispersion and its representation 6 Computational problems 9 Design of prototype aquifer 10 Dependence of freshwater recovery on hydrogeologic characteristics 11 Aquifer permeability and buoyancy stratification 11 Methodology of analysis 12 Results of analysis 12 Anisotropic permeability 15 Methodology of analysis 15 Results of analysis 16 Hydrodynamic dispersion 16 Methodology of analysis 17 Results of analysis 18 Resident fluid salinity 18 Methodology of analysis 18 Results of analysis 18 Aquifer storage capacity 20 Methodology of analysis 21 Results of analysis 21 Background hydraulic gradients and length of storage period 22 Methodology of analysis 23 Results of analysis 23 Dependence of freshwater recovery on design and management parameters 24 Rates of injection and recovery 24 Methodology of analysis 24 Results of analysis 25 Well not open to full thickness of injection zone 25 Methodology of analysis 25 Results of analysis 25 Volume of water injected 27 Methodology of analysis 27 Results of analysis 27 Successive cycles of injection and recovery 27 Methodology of analysis 28 Results of analysis 28 Well-bore plugging 30 Methodology of analysis 30 Results of analysis 32 Multiple-well configurations 33 Methodology of analysis 33 Results of analysis 35 Contents III Summary and discussion of results 36 Relation of recovery efficiency to hydrogeologic characteristics 37 Relation of recovery efficiency to design and management parameters 40 Significance of study 42 References cited 42 Metric conversion factors 44 1. Recovery efficiency computed for a variety of well configurations and injection and withdrawal schedules 34 Contents
