Snowmelt Modeling using UEB and GIS

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Snowmelt Modeling using UEB and GIS
By You Jinsheng

• GIS in WATER RESOURCES

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OBJECTIVE

• Develop techniques for the representation and
  parameterization of subgrid and distributed snow
  processes within snowmelt models.
• Collect data for Green Lake Valley Watershed in
  Colorado
• Snowmelt process and distribution modeling in UEB
  Model and SnowGRID model

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PROJECTIVE OUTLINE

• Calibration and validation of the distribution
  snowmelt model in study watersheds
• Reformulation of the point energy and snowmelt
  model to account for sub-grid variability through
  use of depletion curves
• Development of depletion curves for area typical
  of broad scale elevation model elements,
  establish relationship between depletion curve
  and digital elevation data. Quantify scale
  dependence of depletion curves
• Relationship to topography and scale dependence
  together comprise the guidance to potential users
  on the development of depletion curves for
  practical application of this model.
• Transfer and implement the methods developed
  within NOHRSC operational System.

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Diagram of Snowmelt Process and Distribution
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TODAY'S REPORT

• Current status of the snow modeling project
• Geographical data analysis in the watershed
• Point snowmelt modeling
• Grid snow modeling

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ACKNOWLEDGEMENT

• Dr. David Tarboton

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INTRODUCE TO STUDY SITE

• The Green Lakes Valley (GLV) along the Colorado
  Front Range Comprises 8.1 km2, located
  approximately 35-km northwest of Boulder, CO.
  Elevation ranges from 3204 to 4087m, with most of
  the basin lying above treeline. The GLV study
  area flanks the eastern side of the Continental
  Divide and is part of the Niwot Ridge Long-Term
  Ecological Research (LTER) Project.

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TOOLS
GIS Software Arcview 3.1 with spatial analysis
extension, Sinmap, Tardem Programme Language
Visual C, Visual FORTRAN, Visual
BasicGraphical Tools Splus 2000 Other tools
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PROJECT PROCEDURE

• Data collect
• Formation of Watershed and River Network
• Implementation of UEB (Point Model)
• Sub-grid Distributed Snowmelt Modeling

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DEM of the study watershed
The elevation in this watershed ranges from 3221
to 4087 meters with snow covered in the winter.
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Delineate the river network and watershed

• TarDEM
• Using Dinf method (d8) contributing area

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Green Lake Valley watershed by the Tardem Method
Sub watershed and river network
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Study area data and point snow modeling sites
Data for the modeling sub watershed. Four weather
station is shown in the picture.
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Modeling cumulative snow melt
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Modeling snow water equivalence
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Outline for the Grid Snow modeling
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GridSnow Modeling Procedure
DEM
Weather Data
Aspect
GridSnow
Slope
SWE Map
View Factor
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Snow water equivalence map (May, 22 1996)
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FUTURE WORK

• Depletion Curves Method
• Scale Factor in the Snowmelt Modeling

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QUESTIONS
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REFERENCE