Post on 16-Feb-2016
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Fales River Flood ModelingBrett Andrews
PurposeThe purpose of this project is to analyze historic flood data and to show the extents of the floods based on the elevation of the terrain derived from LiDAR. The years that will be focused on are: 1977, 2008, 2009, and 2010.
Cross Sections• The following cross sections were
created using the 3D Feature to Attribute tool, for the water height and the Interpolate Shape for the Ground.
• Two types of profile graphs −Stream Centerline height at ground and
Flood height.−Cross Sections across the river with
1977 and 2010 and the Ground DEM
Stream Profiles
Cross Sections
Cross Sections
Cross Sections
Cross Sections
Cross Sections
Cross Sections
Basemap• The basemap data was digitized from
a 1:2000 Land Registration and Information Services
• Building were updated using a 2008 Air Photo and missing buildings and roads were added using deflection to create 90 degree corners and perpendicular roads.
Basemap
Flood Extents 1977 & 2010• The following map is showing the
1977 and the 2010 floods overlaid on the basemap.
• The cross sections are labeled with the heights of the 2010 flood.
Flood Extents 1977 & 2010
Hydraulic Gradient Tin and Raster• Tin
−The next 2 maps are showing a gradient tin from slowest to deepest parts of the flood as it followed the river
• Raster−The raster was created from the Tin and
is symbolized based with a gradient fill
Hydraulic Gradient 1977
Hydraulic Gradient 2010
Hydraulic Gradient Raster 1977
Hydraulic Gradient Raster 2010
Past Flood Extents• The next series of map will show the
flood extents from the past 4 biggest floods
• 1977, 2008, 2009, 2010• The floods are layered over the
basemap with the river sitting on top to clearly see the extents of each flood
Flood Extents 1977
Flood Extents 2008
Flood Extents 2009
Flood Extents 2010
ArcScene Composition • The next image is showing the 1977
and 2010 flood extents overlaid on the LiDAR DEM and the base map.
• The Basemap was draped on top of the LiDAR data and the building heights were extracted to make the map 3D
ArcScene Composition
Model Builder
• The Model was created to automate the Flood Polygon creation
• A series of tools were called on in the model
Conclusion • Create flood models from historical
flood data• Created flood extent maps for Raster,
Tins and Polygon• Profile graphs were created to show
the height of the water based on the Ground data
• ArcScene was used to visualize the flood in 3D
Questions & Comments
Sources
• Urban Map: Land Registration and Information Services 1:2000. Mapsheet GREENWOOD- 0244960064920
• LiDAR data gnd345_49792m• Photos: Supplied by Mark Hebert• Software: ESRI ArcGIS Spatial
Analysis and 3D Analysis Suits.