Groundwater modeling using GIS technology Jessie Ackerman.
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Transcript of 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
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
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
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