Author : Thomas G. Naymik
Publisher :
Page : 36 pages
File Size : 45,5 MB
Release : 1978
Category : Radioactive tracers in hydrogeology
ISBN :
Author :
Publisher :
Page : pages
File Size : 37,90 MB
Release : 1978
Category :
ISBN :
A numerical model of a regional ground-water flow system (not site specific) was coupled with a material transport model in order to study the influence of porosity and distribution coefficients in bedded media. The effects on model performance were discerned from long-term material transport simulations. Model performance was based on initial breakthrough time, average breakthrough time, and the standard deviation of the breakthrough curve at a discharge surface. Large differences in model performance occurred when the distribution coefficient was changed less than an order of magnitude, while small differences resulted from changing porosity several orders of magnitude.
Author : Thomas G. Naymik
Publisher :
Page : 23 pages
File Size : 27,77 MB
Release : 1978
Category : Radioactive tracers in hydrogeology
ISBN :
Author : Djoko Luknanto
Publisher :
Page : 274 pages
File Size : 45,76 MB
Release : 1991
Category : Groundwater flow
ISBN :
Author : Bill X. Hu
Publisher :
Page : pages
File Size : 32,91 MB
Release : 2016
Category : Science
ISBN :
Numerical simulation of groundwater flow and solute transport in a dual-permeability karst aquifer is a challenging issue, since groundwater flow in karst conduit network can become non-darcian even turbulent flow. The discrete-continuum model is a relatively new modeling method, which accounts for turbulent and laminar flow in karst aquifer. MODFLOW-CFP (Conduit Flow Process) is compared to the MODFLOW, a numerical code based on Darcy law, to evaluate the accuracy in a sub-regional scale karst aquifer. MODFLOW-CFP is more accurate than the MODFLOW when comparing the head simulation results with field measurements. After that, the CFPv2 and UMT3D numerical models are applied in the WKP to establish a sub-regional scale model to simulate chloride transport processes in the last four decades, and to predict contamination development. Numerical simulation results indicate sprayfields are the major chloride source in the study region. Conduit networks significantly control solute transport and contaminant distribution in the study region. Chloride transports through conduits rapidly and spread to several large contamination plumes in a short period. Chloride concentration started to increase in 1980s due to the operation of sparyfield. Solute transport simulation results by discrete-continuum models are more accurate because of the precise description of conduit network.
Author : Mary P. Anderson
Publisher : Academic Press
Page : 632 pages
File Size : 29,8 MB
Release : 2015-08-13
Category : Technology & Engineering
ISBN : 0080916384
This second edition is extensively revised throughout with expanded discussion of modeling fundamentals and coverage of advances in model calibration and uncertainty analysis that are revolutionizing the science of groundwater modeling. The text is intended for undergraduate and graduate level courses in applied groundwater modeling and as a comprehensive reference for environmental consultants and scientists/engineers in industry and governmental agencies. - Explains how to formulate a conceptual model of a groundwater system and translate it into a numerical model - Demonstrates how modeling concepts, including boundary conditions, are implemented in two groundwater flow codes-- MODFLOW (for finite differences) and FEFLOW (for finite elements) - Discusses particle tracking methods and codes for flowpath analysis and advective transport of contaminants - Summarizes parameter estimation and uncertainty analysis approaches using the code PEST to illustrate how concepts are implemented - Discusses modeling ethics and preparation of the modeling report - Includes Boxes that amplify and supplement topics covered in the text - Each chapter presents lists of common modeling errors and problem sets that illustrate concepts
Author : Sharon E. Kroening
Publisher :
Page : 122 pages
File Size : 20,93 MB
Release : 2004
Category : Earth sciences
ISBN :
Author :
Publisher :
Page : 56 pages
File Size : 12,20 MB
Release : 1987
Category : Groundwater
ISBN :
Author : Maura Agnew Metheny
Publisher :
Page : 494 pages
File Size : 14,60 MB
Release : 1998
Category :
ISBN :
Abstract: The purpose of this study is 1) to describe the geologic framework of east Woburn, Massachusetts, in a regional and local context, 2) to use the available data to reconstruct the geometry of deposits in the buried glacial valley, 3) to create a numerical groundwater flow model that incorporates the geology with correlated values of hydraulic properties, and 4) to use the numerical groundwater flow model to predict particle pathlines and traveltimes for different pumping conditions using transient and steady- state simulations.
Author : William C. Walton
Publisher : CRC Press
Page : 656 pages
File Size : 42,8 MB
Release : 1992-04-14
Category : Technology & Engineering
ISBN : 9780873716796
Groundwater Modeling Utilities is a handy reference guide designed to help groundwater industry professionals learn to use a variety of microcomputer software applications for groundwater modeling and numerical modeling in flow and contaminant migration studies. The book provides the following: (1) handy operation and logic reference supplements to selected groundwater model, pre-processor, post-processor, geostatistics, graphics, CAD, and word processing software supporting documentation; (2) selected model operation practice exercises with extensive step by step input/option prompt and response documentation; and (3) six convenient model database manipulation utility programs stored on two 5-1/4" diskettes included with this book. The disks can be used with all IBM and IBM-compatible computers. The utility programs allow you to convert values from one system of units to another; interpolate between control data points on a curve or surface; calculate heads and partial penetration effects in production wells; create, edit, and convert grid, triplet, listed, and unformatted model data files; and view tabular and category displays of model data files. Groundwater Modeling Utilities covers some of the most popular and thoroughly tested public domain finite-difference numerical microcomputer model software; commercial model software; public domain geostatistics software; and commercial graphics, CAD, and word processing software. Using actual groundwater modeling-specific examples, learn to work with software such as MODFLOW, MOD PATH, MOC, INTERTRANS, INTERSAT, GEOPACK, GRAPHER, SURFER, CADD 5.0, and WordPerfect 5.1. Groundwater Modeling Utilities is a book no groundwater industry professional can afford to be without.
