1 / 16

Automated Snow Measurement R&D at NCAR and NOAA: the Marshall testbed

Automated Snow Measurement R&D at NCAR and NOAA: the Marshall testbed. Ethan Gutmann, Bruce Baker, Roy Rasmussen, John Kochendorfer , David Gochis , Scott Landolt , Tilden Meyers, Kristine Larson 5/25/2011. Snow measurement importance. Which size snowplow would you want? .

keefe
Download Presentation

Automated Snow Measurement R&D at NCAR and NOAA: the Marshall testbed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Automated Snow Measurement R&D at NCAR and NOAA: the Marshall testbed • Ethan Gutmann, Bruce Baker, Roy Rasmussen, John Kochendorfer, David Gochis, Scott Landolt, Tilden Meyers, Kristine Larson • 5/25/2011

  2. Snow measurement importance • Which size snowplow would you want?

  3. Snow Measurement is HARD • Spatial variation • Snow depth varies from 0-3m over the space of 50m! • harsh environments • ice on equipment • temperatures <<0C Map of

  4. Existing and Emerging methods • Ultrasonic distance • Scanning (or not) laser rangefinder • GPS interference reflectometry • Precipitation: snow gauges • (COSMOS, Snow Pillows, Aircraft LIDAR,…) (*there is always the good old ruler)

  5. Marshall

  6. Precipitation measurement • Wind shields affect precipitation measurement

  7. Ultrasonic Snow Depth • Bounce a sound wave off the snow • footprint: ~1m2 • Affected by • air temperature • snow in air

  8. Ultrasonic Snow Depth • Location is critical • Ground surface is critical • Replication is critical • Hourly totals? • 6hr?

  9. Ultra Sonic Depth • Sensor can shift almost imperceptibly • with snow on them... ~30cm Snow Event

  10. Laser Rangefinder (non-scanning) • Bounce light pulse off snow • footprint: 1mm2 • NOT affected by • air temperature • snow in air

  11. Laser Rangefinder (non-scanning) Ultrasonic • Location is critical • Ground surface is critical • Signal is cleaner • hourly totals... Laser

  12. Scanning Laser Rangefinder • Bounce a light pulse off the snow • footprint: <7km2 • affected by: • snow on lens and in air

  13. Laser Rangefinder (non-scanning) • Produces a map! • Location is NOT (too) critical • Ground surface is NOT (too) critical • Stability is critical

  14. GPS Interference Reflectometry (GPS-IR) • Observe noise in GPS signal • footprint: 2000m2 • affected by: • topography • vegetation

  15. GPS-IR • Location is important • Ground cover is important • Free existing networks! • ~1-2hr averages...

  16. Sensor Review Comments Location / Cheap Location / Cheapish Stability / Cost Location / (Free) Accuracy / Cost / Time Accuracy 1cm 1mm <1cm ~1-2cm >5-10cm Area 1m2 1mm2 <7km2 3000m2 100km2 • Sonic • Laser • Scanning • GPS • Lidar

More Related