Simulation of Short Circuit Flow Paths and Transient Conditions to Understand Vulnerability of Public Supply Wells to Contamination in the High Plains.

Slides:

Advertisements

Similar presentations

Water Table and Aquifers

Advertisements

Groundwater and Wells Two types of wells:

Hydraulic Property Distribution Estimation through Groundwater Modeling of the Observed Effects from “Uncontrolled” Resident Hydraulic Stress Presented.

Overview and Issues of the High Plains Aquifer, Oklahoma, 2010 Mark F. Becker U.S. Geological Survey Oklahoma City, Oklahoma.

The Floridan Aquifer/Chipola River System Study The Floridan Aquifer/Chipola River System Study Christy Crandall U.S. Geological Survey Tallahassee, Florida.

Distribution of Nitrate in Ground Water Under Three Unsewered Subdivisions Erin P. Eid Mike Trojan Jim Stockinger Jennifer Maloney Minnesota Pollution.

GIS – BASED DRASTIC MODEL FOR ASSESSING

APPLICATION OF GROUND-WATER DATING TECHNIQUES FOR EVALUATING THE SUSCEPTIBILITY OF AQUIFERS AND PUBLIC-SUPPLY WELLS TO CONTAMINATION National Water Quality.

Factors that Influence the Occurrence of Nitrate in the Upper Willamette Valley Basic Groundwater Hydrology Understanding Nitrate and its Distribution.

(e.g., the Toth Problem) z x z x h = c x + z o Profile Models.

Subsurface Hydrology Unsaturated Zone Hydrology Groundwater Hydrology (Hydrogeology )

Acquisition and Interpretation of Water-Level Data Travis von Dessonneck.

A Discussion of Groundwater Modeling and Climate Change By Leslie Llado.

Aquifers are typically saturated regions of ground water which produce an economically feasible quantity of water to a well or spring.

FSA Groundwater Flow and Solute Transport Model Presentation to Scottsdale Citizens Group March 19, 1999.

Determination of Ellenburger Aquifer Sustainability

Groundwater Modeling Study case : Central Plain of Thailand

Water Cycle and Watersheds

III. Ground-Water Management Problem Used for the Exercises.

Hydrogeologic Data Collection for Water-Resources Evaluation in Bedford County, Virginia Brad White, Virginia Department of Environmental Quality, Ground.

The Water Cycle Also called the hydrologic cycle Describes the continuous movement of water on, above, and below the surface of the Earth The balance of.

- Water beneath the Earth’s surface in sediment and rock formations.

OHSU Oregon Health & Science University Conceptual Framework for Evaluating the Impact of Inactive Wells on Public Water Supply (PWS) Wells Rick Johnson.

Groundwater Modeling – 3 Transient Models Groundwater Hydraulics Daene C. McKinney.

Proposed Tools and Approach for Ground-Water Vulnerability Assessment (GWAVA) Using a Geographic Information System and Simulation Modeling Jack Barbash.

Section 10.1 Movement and Storage of Groundwater Objectives

Ground Water. Makes up 0.397% of Earth’s Water. - song.

Tracking Groundwater Contamination

Groundwater All water found underground, frequently in: Joints and cracks in rocks Open space between sediment grains.

Simulation of Short Circuit Flow Paths and Transient Conditions to Understand Vulnerability of Public Supply Wells to Contamination in the High Plains.

Use of Depth-Dependent Sampling to Determine Source Areas and Short- Circuit Pathways for Contaminants to Reach Public-Supply Wells, High Plains Aquifer,

Kenneth D. Schmidt Principal Kenneth D. Schmidt & Associates.

Edward’s Aquifer Ground-water Flow Model Texas Ground Water 2004 November 19, 2004 George B. Ozuna.

Use of multiple tracers and geochemical modeling to assess vulnerability of a public supply well in the karstic Floridan aquifer Brian Katz1, Christy Crandall1,

Groundwater response to stream stage fluctuations in a regulated stream, New Martinsville, WV Madan Maharjan Joe Donovan West Virginia University.

Ogallala Formation (containing High Plains Aquifer): Deposited over 10 million years ago Coarse-grained sand, gravel, fine clay, silt, and sand 174,000.

Example - Use of a simulation- optimization approach to assess potential strategies for groundwater management in the Albuquerque area, New Mexico.

Final Project I. Calibration Drawdown Prediction Particle Tracking

U.S. Department of the Interior U.S. Geological Survey Screening-Level Assessments of Public Water Supply Well Vulnerability to Natural Contaminants Stephen.

U.S. Department of the Interior U.S. Geological Survey Evaluating uncertainty in areas contributing recharge to wells for water-quality network design.

How does groundwater flow ? February 26, TOC  Definitions  Groundwater flow overview Equipotentials and flowlines  Wells  Laplace  Boundary.

Steady-State and Transient Models of Groundwater Flow and Advective Transport, Eastern Snake River Plain Aquifer, INL and Vicinity, Idaho Jason C. Fisher,

IX. Transient Forward Modeling. Ground-Water Management Issues Recall the ground-water management issues for the simple flow system considered in the.

Hydrology & Climatology (including Geohydrology) Louisiana Department of Environmental Quality 2010 Envirothon Training.

Some Observations from Using a Colloidal Borescope in Basalt Aquifers Gerry Winter.

Flow to Wells - 1 Groundwater Hydraulics Daene C. McKinney.

Rainfall and Runoff Reading: Haested Section 2.4 Computing Hydrographs.

Objective: conceptual model definition and steady state simulation of groundwater flow.

Combo Circuits & EMF. How much current flows from the battery in the circuit below? 12V 400  500  700 

Workshop on “Coastal Aquifer Management in the Caribbean” 14 th - 16 th December 2011 Trinidad and Tobago Workshop on “Coastal Aquifer Management in the.

AQUIFER STORAGE AND RECOVERY DESIGN CONCEPTS- KEYS TO SUCCESS Thomas M. Missimer, Ph.D. Missimer Groundwater Science, A Schlumberger Company Fort Myers,

Building Transient MODFLOW Models

Groundwater Modeling Assignment #2. Parts A and B.

Western Slope Bible Camp OWTS Hydrogeological Risk Assessment

Development and Application of a Groundwater-Flow Model of the Atlantic Coastal Plain aquifers, Aiken County, South Carolina to Support Water Resource.

Reported by: Loven S. Getutua

Groundwater Basics.

Porosity, Permeability and Aquifers

Aquifers and Groundwater flow

allison aldous joseph gurrieri roger congdon trish carroll leslie bach

CON 101 Waters Frank Smith ><<{{{(‘>

HYDROSPHERE Groundwater.

Porosity, Permeability and Aquifers

Dewatering Solutions using MODFLOW

Conceptual model of an unconfined aquifer

Water Table: is the level at which the groundwater pressure is equal to atmospheric pressure. Aquitard: is a zone within the earth that restricts.

GIS – BASED DRASTIC MODEL FOR ASSESSING

Water Table: is the level at which the groundwater pressure is equal to atmospheric pressure. Aquitard: is a zone within the earth that restricts.

Presentation transcript:

Simulation of Short Circuit Flow Paths and Transient Conditions to Understand Vulnerability of Public Supply Wells to Contamination in the High Plains Aquifer, York, Nebraska Brian Clark Matt Landon Leon Kauffman George Hornberger 4/12/2005

Take-Home Messages Wellbores drilled through confining units can act as “short circuits” Transient stresses provide opportunities for pulses of flow Combination of transient stresses and wellbores through confining units can allow contaminants to lower layers

Study Background USGS National Water-Quality Assessment (NAWQA) program NAWQA topical study: Transport of Anthropogenic and Natural Contaminants (TANC) to public supply wells TANC goal: determine controls on movement of contaminants to public supply wells

Study area Recharge zones Observation wells Potential contaminant sources Multi-node pumping wells RCRA, LST, NPDES Water / wastewater Landfill / livestock Superfund !. !. !. !. Transect FP5 FP4 FP3 FP1

Hydrogeology unconfined sand upper confined sand Electrical Resistivity logs Well screens

Confined and unconfined water-levels many wells are commonly screened in unconfined and confined layers Date

Model discretization Specific yield 0.2 to 0.25 unconfined sand upper confined sand HK values0.315m/d Specific Storage 1 x x per meter Fine  coarse

Transient stresses Simulation time –Sept 1944 to Sept 2004 Seasonal stress periods –Irrigation pumpage off during winter Multi-node wells allow flow through wellbores Halford, K.J. and Hanson, R.T., 2002

Hydrograph comparison Simulated Observed unconfined confined

YEARMEANMINMAXRMS MEAN ABS COUNT Residual Statistics all units in meters Residuals = observed minus simulated

Transport model sub-grid 13 layers (2-14) Version of GWT to support MNW 61 rows 122 columns Age & CFC boundary by layer observation wells

Simulated age animation Age, in years Cross-sectional view

Simulated age animation Age, in years Map view cutaway

Age of water vs depth below water table (unconfined wells only) (measured= tritium-helium ages)

CFC concentration vs depth below water table (confined wells only)

Conclusions Wellbores drilled through confining units act as “short circuits” for flow Simulated transient stresses provide pulses of flow Transient stresses and wellbores through confining units allow flow and contamination to lower layers

Contact information Brian Clark - Matt Landon – Leon Kauffman – George Hornberger – 4/12/2005