workshop for watershed management using web-based decision support tools bernard a. engel jin-yong...
TRANSCRIPT
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Workshop for Workshop for Watershed Watershed
Management Using Management Using Web-Based Decision Web-Based Decision
Support ToolsSupport Tools
Bernard A. EngelBernard A. Engel
Jin-Yong ChoiJin-Yong Choi
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ToolsTools
• Web-based Watershed Delineation
• L-THIA: Long-Term Hydrologic Impact Assessment
• SEDSPEC: Sediment and Erosion Control Planning, Design and SPECification Information and Guidance Tool
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Web GIS Based Web GIS Based Online Watershed Online Watershed
Delineation CapabilityDelineation Capability
Bernard A. EngelBernard A. Engel
Jin-Yong ChoiJin-Yong Choi
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• Watershed: A basin, drainage or catchment area that is the land area that contributes runoff to an outlet point
Outlet pointWatershed boundary
Rain
Runoff
What is WatershedWhat is Watershed
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What is Watershed DelineationWhat is Watershed Delineation
• Watershed Delineation: Define the watershed boundary based on topographical information about an outlet point
• Outlet point: A point on a stream or river of interest.
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Why we need Watershed Delineation Why we need Watershed Delineation (WD) capability(WD) capability
• Need to understand target area and its features that are related with hydrologic phenomena to be analyzed at outlet point (e.g. peak runoff)
• Control boundary (watershed) is needed to gather hydrologic data including soil, land use, weather
• Watershed delineation is first hydrologic analysis step
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Methodology (1)Methodology (1)
• Traditional Approach– Hand drawn on a
paper topographic map– Contour line
(Continuous line for the same elevation points) use
– Requires experience and labor
– Analogue approach– Manual
Outlet point
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Methodology (2)Methodology (2)
• Using DEM and desktop GIS software– Digital Elevation Model (DEM): Grid format,
Each grid has elevation (altitude) value– GIS: Geographic Information System:
Computer program for digital mapping– Possible automatic data preparation
• WebGIS tools– WWW + GIS: Yahoo Map, MapQuest– Preprocessed data, limited functionalities
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Where to begin?Where to begin?
http://pasture.ecn.purdue.edu/~watergenhttp://pasture.ecn.purdue.edu/~watergen
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Display FunctionsDisplay Functions
Main Menu
Layer ControlOn/Off
Map Display
Display ControlZoom in/outPan, Full extent
Auxiliary Functions
Reference Map
WD Submit Button
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Using the SDSSUsing the SDSSIndian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
Outlet point selected
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Results PageResults Page
Using the SDSSUsing the SDSSIndian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
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Watershed Delineation:Watershed Delineation:Indian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
Run hydrologic models- Impervious Area - L-THIA- SEDSPEC- Peak Runoff Estimation
Results Page Results display
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Download and Print MapDownload and Print Map
Using the SDSSUsing the SDSSIndian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
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On-line Digitizing Tool:On-line Digitizing Tool:Indian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
Land Use Change Using On-line Digitizing Tool and Run L-THIA
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Land Use Change Using On-line Digitizing Tool and Run L-THIA
Land Use Change Report after Digitizing
Land Use Change Using On-line Digitizing Tool
On-line Digitizing Tool:On-line Digitizing Tool:Indian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
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Land Use Change Using On-line Digitizing Tool and Run L-THIA
Land Use Change Report after Digitizing
Scenario 1: Before Change
Scenario 2:After Change
On-line Digitizing Tool -> Input PreparationOn-line Digitizing Tool -> Input PreparationIndian Creek, Tippecanoe County, IndianaIndian Creek, Tippecanoe County, Indiana
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Thank you !Thank you !
http://pasture.ecn.purdue.edu/~watergenhttp://pasture.ecn.purdue.edu/~watergen