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Groundwater modeling using GIS technology

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									Groundwater modeling using
     GIS technology

        Jessie Ackerman
                 Introduction
• Groundwater is an
  important freshwater
  resource
• Groundwater is held in
  aquifers
• Studying groundwater is
  difficult because it’s
  underground
• Groundwater modeling was
  developed to understand
  what’s going on
• Modeling has developed as
  new technologies have
  developed
               Purpose
• Understand how GIS is used in
  groundwater modeling
• Analyze current material on topic
• Decide if GIS is useful in modeling
  groundwater
Basics of groundwater
           • Darcy’s Law
                Q = - Ksat*A*dh/dx
           • Understanding of flow
           • Modeling developed
             first from an
             understanding of
             Darcy’s
             Law
     Groundwater modeling
• Field data including hydrological inputs,
  hydraulic parameters and initial and
  boundary conditions are gathered
• Data input into modeling software
• Models can be 1-D, 2-D, semi 3-D and
  3-D
1-D model
2-D model
Semi 3-D model
Integrating GIS in models
             • GIS is a true 3-D model
             • Hydrologists looked to
               GIS to demonstrate
               erosion, sediment
               transport, and chemical
               transport simulations
             • Needed a program that
               could handle lots of
               data
             • Need to connect
               globally
              Basics of GIS
• A computer system
  designed to process
  information with a
  spatial content
  dimension
• Composed of a
  geographical database
  and a toolkit
Modeling
with GIS
        Example using GIS
           technology
• Searching for suitable area to tap
  aquifer near a landfill or other area of
  possible contamination
• Landfill data and aquifer data input into
  GIS model
• Program runs all possible situations
 Work being done now using
      GIS technology
• Recharge and discharge rates of
  aquifers
• Used to make important decisions about
  water management
• Illinois State Water Survey and
  University of Illinois
Buena Vista Ground Water Basin, Wisconsin
      Analysis of resources
• All but one source spoke well of using
  GIS within groundwater modeling
• One source just tells hydrologists to be
  wary in using only GIS software to
  model groundwater
             Conclusions
• Gained an understanding of how GIS is
  used in groundwater modeling
• GIS is very useful in creating 3-D
  models that incorporate lots of data
• The best way to know if any advanced
  model is right is to go through it the long
  way first than to take shortcuts

								
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