Computer Model Simulations to Predict Impacts of Groundwater Withdrawal in 2011 and 2030 Flagler County, Florida PDF Download

Author:
Publisher:
ISBN:
Category : Aquifers
Languages : en
Pages :

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Author: Louis Charles Murray
Publisher:
ISBN:
Category : Floridan Aquifer
Languages : en
Pages : 38

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Author: R. M. Spechler
Publisher:
ISBN:
Category : Floridan Aquifer
Languages : en
Pages : 126

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Author: C. B. Hutchinson
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 38

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Author: Gary M. Russell
Publisher:
ISBN:
Category : Groundwater flow
Languages : en
Pages : 384

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Author: Zoe Oriel Futornick
Publisher:
ISBN:
Category : Groundwater
Languages : en
Pages : 127

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From the Abstract: Surface waters in the Yakima River Basin in central Washington are considered over allocated. Since 1960, new water demands have been met through groundwater withdrawals, with most groundwater users holding a later priority date than senior and junior surface water users. As a result of the discussions surrounding this issue, the Upper Kittitas Groundwater Rule has been in effect since 2010. Pumping from new domestic (i.e., permit-exempt or “exempt”) groundwater wells in Upper Kittitas County is not allowed unless mitigation is used to offset the groundwater use. The United States Geological Survey (USGS) has already created a basin-wide model for the Yakima River Basin for the period October 1959 through September 2001; however, the hydrogeology of Upper Kittitas County is coarsely represented in the USGS model because individual bedrock units are not delineated. Based on the USGS Yakima River Basin groundwater flow model (hereafter the YRB-GFM), an Upper Kittitas County groundwater flow model (hereafter the UKC-GFM) was extrapolated to refine the Upper Kittitas County modeled region. This new model constitutes an M.S. thesis, done in collaboration with the USGS. The UKC-GFM contains 246 columns and 195 rows, with 1,000 foot grid cells, and five layers representing three basin fill units, basalt, and bedrock; it is populated with model information for the period October 1991 through September 2001. Refinements to the UKC-GFM include: (1) using a newer version of MODFLOW (MODFLOW-NWT) with the new Newton Solver and the Upstream Weighting (UPW) package. The YRB-GFM used MODFLOW-2005, the PCG2 Solver, and the Hydrogeologic-Unit Flow (HUF) Package; (2) incorporating zone arrays with multiple hydraulic properties into model bedrock layers; (3) extending streamflow-routing cells into smaller headland creeks; (4) changing simulated monthly reservoir stages from steady state to time variant; and (5) estimating new parameter values. The UKC-GFM was calibrated using trial-and-error methods and automated parameter estimation with the software PEST. Groundwater model calibration involves comparing measured water levels and streamflow observations with simulated water levels and streamflow values. At 116 well observation points, the calibrated model produces a root-mean-square (RMS) error divided by the total difference in water levels of 1.5 percent, an acceptable error. Annual differences for measured and simulated streamflow ranged from 7 to 11 percent (percent difference) along the Yakima River, and ranged from 19 to 49 percent along tributaries. Once calibrated, the UKC-GFM was run as three scenarios to assess responses of the flow system to potential changes in stresses. These scenarios are: (1) Existing Conditions without All Pumping, (2) Decrease Recharge by Fifteen Percent, and (3) Increase Pumpage by Fifteen Percent. The scenario with the greatest impacts to stream leakage is Scenario 2, where the annual difference in streamflow for the most downstream gage in 2001, the end of the model simulation period, is approximately 80 ft3/sec. This is a 4.7 percent decrease in streamflow, versus Scenario 1 (all pumping removed), which produces a 0.17 percent increase in streamflow. A comparison of the applied scenarios suggests that potential climate changes that decrease recharge have more impacts on streamflow than groundwater pumping.

Author: Aly I. El-Kadi
Publisher: CRC Press
ISBN: 1351443909
Category : Technology & Engineering
Languages : en
Pages : 380

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Written by renowned experts in the field, this book assesses the status of groundwater models and defines models and modeling needs in the 21st century. It reviews the state of the art in model development and application in regional groundwater management, unsaturated flow/multiphase flow and transport, island modeling, biological and virus transport, and fracture flow. Both deterministic and stochastic aspects of unsaturated flow and transport are covered. The book also introduces a unique assessment of models as analysis and management tools for groundwater resources. Topics covered include model vs. data uncertainty, accuracy of the dispersion/convection equation, protocols for model testing and validation, post-audit studies, and applying models to karst aquifers.

Author: National Research Council
Publisher: National Academies Press
ISBN: 0309039932
Category : Science
Languages : en
Pages : 320

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The discovery of toxic pollution at Love Canal brought ground water contamination to the forefront of public attention. Since then, ground water science and modeling have become increasingly important in evaluating contamination, setting regulations, and resolving liability issues in court. A clearly written explanation of ground water processes and modeling, Ground Water Models focuses on the practical aspects of model application. It: examines the role of models in regulation, litigation, and policy development; explains ground water processes and describes specific applications for models; presents emerging technologies; and offers specific recommendations for better use of ground water science in policy formation.

Author: Mary P. Anderson
Publisher: Academic Press
ISBN: 0080916384
Category : Technology & Engineering
Languages : en
Pages : 632

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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: Stanley A. Williams
Publisher:
ISBN:
Category : Floridan Aquifer
Languages : en
Pages : 218

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