Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury...
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Transcript of Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury...
![Page 1: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/1.jpg)
Using GIS to estimate the volume of snow and water
in a drainage basinTodd Rayne and Dave TewksburyHamilton College Clinton, New York
![Page 2: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/2.jpg)
Goals of the exercise:
• Relationship between linear and volume measurements
• Spatial variability of snow depth
• Snow depth and water content
• Representative sampling
• Error analysis
• and GIS experience, naturally!
• Used as a lab exercise in a spring semester 200-level hydrogeology course with no GIS prerequisite.
• Students have completed two introductory GIS exercises on their own.
![Page 3: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/3.jpg)
Field area is athletic fields and adjacent golf course
Field materials: GPS unit, meter stick, clipboard
Time allotted to measure snow depths: ~90 minutes
![Page 4: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/4.jpg)
![Page 5: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/5.jpg)
Example of good sampling distribution
![Page 6: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/6.jpg)
Example of uneven sampling distribution. Note the linear pattern that shows their route.
![Page 7: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/7.jpg)
1. Extract ground elevations at sampling points from DEM and add snow depths in attribute table to create snow elevations.2. Create polyline boundary to limit the surface extent.3. Contour snow elevations
![Page 8: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/8.jpg)
Volume map of study area. Red is gain of volume; blue is loss of volume. Whyare some of the cells blue when the snow cover is continuous?
![Page 9: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/9.jpg)
Same measurement points with deeper (0.3 m) snow.
![Page 10: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/10.jpg)
Snow volume in an area with unevenly distributed sampling locations.
![Page 11: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/11.jpg)
Follow-up (usually the following day or week):
• Troubleshooting GIS problems
• Summation of snow volume values in red cells
• Measurement of snow density
• Conversion of snow volume to water volume
• Discussion of why all the cells in the study area are not red
• Discussion of snow accumulation and hydrology
![Page 12: Using GIS to estimate the volume of snow and water in a drainage basin Todd Rayne and Dave Tewksbury Hamilton College Clinton, New York.](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f285503460f94c404c8/html5/thumbnails/12.jpg)