Modflow Simulation on Savannah River

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Modflow Simulation on Savannah River

• GIS For Water Resources Term Project
• (CE 394)

• Seyoum Asemenaw

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ModFlow

• Defn- Modflow is a 3-D finite difference GW flow
  model that solves the continuity equation (Mod
  flow 2000).
• Various mod flow packages-
• BCF6 -- Block-Centered Flow Package
• LPF1 -- Layer-Property Flow Package
• RIV6 -- River Package
• DRN6 -- Drain Package
• WEL6 -- Well Package
• GHB6 -- General Head Boundary Package
• RCH6 -- Recharge Package
• EVT6 -- Evapotranspiration Package
• CHD6 -- Time-Variant Specified-Head Package
• HFB6 -- Horizontal Flow Barrier Package
• SIP5 -- Strongly Implicit Procedure Package

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Term Project Goals

• The major objectives are-
• To build a modflow interface geodatabase schema
• To show the relationships between various feature
  classes
• To show a time series analysis using Modpath
• ModPath-calculate streamlines and travel times
  along streamlines within the ModFlow daomain.
• Data sources
• Savannah River Authority
• USGS website
• CRWR

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Savannah River Site
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Building a Modflow Mesh (Fishnet)
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Fishnet in Workstation Arc/Info

• Building Fishnet
• The fishnet prompts are -
• Arc generate f2
• Generate fishnet
• Origin Coordinate (x, y) 437005,3681499 m
• Y-Axis coordinate (x,y) 437005,3682990 m
• Cell Size (width, Height) 91.44,91.44 m
• Number of Rows, columns 15,22
• Generate quit
• Polygon construction
• Arc build f2
• Generate quit

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Resulting Mesh in ArcMap
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Modflow Interface Data Model
(Developed by Gil Strassberg)
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Modflow Schema in Visio 2000
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From Schema to Repository
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Applying the Schema to Savannah River Data
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ModFlow River Package
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ModFlow General Head Boundary
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ModFlow Well Package
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ModPath Simulation
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ModFlow

• Special thanks to-
• Gil Strassberg
• Dr. David Maidment
• CRWR crew