snow depth
DESCRIPTION
Snow Depth. Property with potentially largest variation in space. Snow Depth. Property with potentially largest variation in space Measure vertical to earth’s surface. Snow Depth. Property with potentially largest variation in space Measure vertical to earth’s surface. Snow Depth. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/1.jpg)
Snow Depth
• Property with potentially largest variation in space
![Page 2: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/2.jpg)
Snow Depth
• Property with potentially largest variation in space
• Measure vertical to earth’s surface
![Page 3: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/3.jpg)
Snow Depth
• Property with potentially largest variation in space
• Measure vertical to earth’s surface
![Page 4: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/4.jpg)
Snow Depth
• Property with potentially largest variation in space
• Measure vertical to earth’s surface
![Page 5: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/5.jpg)
Snow Depth
• Property with potentially largest variation in space
• Measure vertical to earth’s surface
![Page 6: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/6.jpg)
SWE measurement
• Mass of water over a unit area – Weigh cylindrical snow sample
• Typically the Mt. Rose or Federal Sampler is used
• A gravimetric technique
![Page 7: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/7.jpg)
SWE measurement
1. Clean the snow tube of debris, snow, etc.
cutter/teeth
snow tube
![Page 8: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/8.jpg)
SWE measurement
1. Clean the snow tube 2. Tare the snow tube
scale
snow tube
cutter/teeth
![Page 9: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/9.jpg)
SWE measurement
1. Clean the snow tube 2. Tare the snow tube
scale
snow tube
![Page 10: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/10.jpg)
SWE measurement
1. Clean the snow tube 2. Tare the snow tube3. Insert tube vertically
![Page 11: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/11.jpg)
SWE measurement
1. Clean the snow tube 2. Tare the snow tube3. Insert tube vertically4. Rotate tube into snowpack
![Page 12: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/12.jpg)
SWE measurement
1. Clean the snow tube 2. Tare the snow tube3. Insert tube vertically4. Rotate tube into snowpack5. Twist sharply at bottom
![Page 13: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/13.jpg)
1. Clean the snow tube 2. Tare the snow tube3. Insert tube perpendicular4. Rotate tube into snowpack5. Twist sharply at bottom6. Pull out vertically
SWE measurement
![Page 14: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/14.jpg)
1. Clean the snow tube 2. Tare the snow tube3. Insert tube perpendicular4. Rotate tube into snowpack5. Twist sharply at bottom6. Pull out vertically7. If an entire column has been
removed, weigh tube with core
SWE measurement
![Page 15: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/15.jpg)
1. Clean the snow tube 2. Tare the snow tube3. Insert tube perpendicular4. Rotate tube into snowpack5. Twist sharply at bottom6. Pull out vertically7. If an entire column has been
removed, weigh tube with core
SWE measurement
![Page 16: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/16.jpg)
Snowpack Density
• Average density = SWE / depth
![Page 17: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/17.jpg)
Snowpack Density
Stratified densities from snow pits1. Dig a pit to the bottom
2. Include a stairway
3. Cut a straight face along the southern wall
4. Measure total depth
5. From top or bottom, measure densities at 10cm intervals
6. Concurrently measure temperature
![Page 18: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/18.jpg)
Snowpack Density
• Kelly Cutter density sample extracter:
![Page 19: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/19.jpg)
Snowpack Density
• Kelly Cutter density sample extracter:
![Page 20: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/20.jpg)
Snowpack Density
• Kelly Cutter density sample extracter:
![Page 21: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/21.jpg)
Snowpack Density
5. From top or bottom, measure densities at 10cm intervals
– Clean wedge-shaped sample extracter (Kelly cutter)
– Tare sample extracter
– Insert sampler vertically to sample wall with bottom parallel to the ground
– Slide plate along open side of sampler
– Pull sampler and plate from wall
– Remove excess snow from bottom and side of sampler
– Weigh sampler and sample
– Density = mass / volume
![Page 22: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/22.jpg)
Snowpack Density
• Line up sampler perpendicular
face of pit wall
PLAN VIEW
![Page 23: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/23.jpg)
Snowpack Density
• Insert sampler perpendicular
PLAN VIEW
![Page 24: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/24.jpg)
Snowpack Density
• Insert sampler perpendicular
PLAN VIEW
![Page 25: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/25.jpg)
Snowpack Density
• Insert sampler perpendicular
• Do not push into snow wall
PLAN VIEW
![Page 26: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/26.jpg)
Snowpack Density
• Slide lid along open face
PLAN VIEW
![Page 27: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/27.jpg)
Snowpack Density
• Slide lid along open face
PLAN VIEW
![Page 28: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/28.jpg)
Snowpack Density
• Slide lid along open face
PLAN VIEW
![Page 29: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/29.jpg)
Snowpack Density
• Extract sampler perpendicular
PLAN VIEW
![Page 30: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/30.jpg)
Snowpack Density
• Extract sampler perpendicular
PLAN VIEW
![Page 31: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/31.jpg)
Snowpack Density
• Volume of Kelly cutter = 1 L
Mass of sample = density
![Page 32: Snow Depth](https://reader033.vdocuments.us/reader033/viewer/2022051019/56815881550346895dc5e297/html5/thumbnails/32.jpg)
Shallow Snowpacks
• Less snow, potential for greater relative variation
• Take measurement large cores – eg. MSC sampler with = 7.8 cm
• Smaller stratified samplers – eg. 250 – 500 ml Kelly cutter