Characterization of hydrofacies in the 300 area, Hanford Nuclear Reservation, Washington

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Authors:Naugle, Greg D.
Source:152p. Institution: Colorado School of Mines, Golden, CO, United States
Publication Date:1989
Note:In English. Master's thesis
Summary:The 300 Area of the Hanford Nuclear Reservation, located in south-central Washington, is the focus of a contaminant migration investigation. The preliminary objectives of the contaminant migration investigation include an assessment of the hydrogeology of the site. This study represents a part of the overall investigation and includes: 1. Utilization of the existing geologic information to define hydrologic stratigraphic units (hydrofacies). 2. Evaluation of the existing hydrologic test data to obtain values of hydraulic parameters for the identified hydrofacies. Existing geologic data includes field observations and geologic descriptions of samples obtained from boreholes. These data were utilized to develop a method of mapping hydrologically similar units (hydrofacies) on the basis of grain-size percentages. The resulting hydrofacies maps represent three-dimensional distributions of sediment that have similar hydraulic properties. Application of the hydrofacies maps requires that representative values of hydraulic parameters be assigned to each hydrofacies. Hydraulic parameters were obtained from aquifer-test data, time series analysis of river-aquifer interactions, and grain-size distribution data. These data sources were used to assign values of hydraulic conductivity and specific yield to each hydrofacies. The hydrofacies mapping system developed in this study represents a method of systematically defining geologic heterogeneities for the purpose of designing and planning future groundwater monitoring and testing. Additionally, the hydrofacies are designed to be readily integrated into a numerical model. Hydrofacies delineate three-dimensional heterogeneities in a groundwater flow-system, and therefore more accurately portray the geometry of subsurface sediments.
Subjects:Aquifers; Environmental geology; Grain size; Ground water; Hydraulic conductivity; Hydrogeology; Movement; Pollution; Three-dimensional models; Transport; Benton County Washington; Franklin County Washington; Grant County Washington; Hanford Site; United States; Washington; Hydrostratigraphic units; Southeastern Washington
Record ID:1992059927
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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