Hydrological Services
America
Excellence in Snow Measurement
Snow Depth sensor - USH-8
Snow Scale - SSG
Snow Pack Analyzer – SPA
Snow depth
Snow temperature
Snow water
equivalent
Liquid water content
in snow pack
Snow melt-off
prediction
Snow Measurement 2013
Varied Terrains
USH-8 Ultra Sonic
Snow Depth Sensor
USH-8 Ultra-Sonic Snow
Depth Sensor
Designed for extreme
conditions
Protective shield against
icing
Integrated lightning
protection
High accuracy - integrated
temperature compensation
Sealed Ceramic Membrane –
no measurement loss
USH-8 Snow Depth Sensor
Analog:
•
Output: Snow depth
•
4 - 20mA (configurable)
Digital:
•
Output: Snow depth,
air temp, quality flag
•
Connection via RS 232
USH-8 Ultra-Sonic Snow Depth Sensor
Snow Measurement 2013
H (m)
Ø (m)
DB (m)
2
3
4
5
6
7
8
0,4
0,6
0,8
1,1
1,3
1,5
1,7
1,0
1,2
1,4
1,6
1,8
2,0
2,2
USH-8 Snow Depth Sensor
Snow Measurement 2013
SNOW SCALE SSG
SWE (Snow Water Equivalent) Sensor
SSG – SWE Sensor
Continuous Snow-Water-Equivalent
(SWE)
Minimizes ice bridging
High accuracy during melting perforated aluminum plates allow
thermal flow between sensor &
ground
No antifreeze liquid required
Light & robust aluminum
construction
Minimal preparation of measuring
site required
Text
Higher Accuracy during melting
process
Compared to Snow Pillow
Modular construction no part heavier than 10 kg
SPA
Snow Pack Analyzer
SPA-Snow Pack Analyzer
Automatic & Continuous
Measurement of Snow
Parameters
Snow Depth
Snow Density
Snow Water Equivalent
(SWE)
Content of liquid, water &
ice
SPA-Snow Pack Analyzer
Automatic, continuous
measurement, no
measurement errors
caused by ice layers
Installation on hillsides
Valuable data input
•
Entire snow pack
•
At a specific depth
(multiple sensors at different
heights)
•
Extended area - measure with
up to 4 SPA-sensors
SPA – Snow Pack Analyzer
Spa Measurement Principle
Three components of snow are
determined:
•
Ice
•
Liquid water
•
Air
The dielectric constant between
ice, water and air is different
The dielectric constant is
determined by complex
impedance measurements
SWE from SPA and Snow Pillow
Snow Measurement 2013
SWE from SPA and new Snow
Snow density at 10cm near ground
Snow Measurement 2013
Run-off prediction
C
A
B
Point B
Point A
»
Snow compression starts
»
Significant increase
Point C
»
Run-off starts
»
SWE decreases
of liquid water
»
SWE constant
content prior to the
start of the run-off
SPA – Snow Pack
Analyzer
Forecast of water capacity from snow melt and
run-off
Flood prevention
Management of hydro power resources
Liquid water content
Prediction of wet snow avalanches
Flood prediction
Large areal resolution
Calibration of remote sensing data
Calibration of numeric models
SPA – Snow Pack Analyzer
Snow Measurement 2013
Questions?
Hydrological Services America is happy to
answer them
Email us sales@hydrologicalusa.com
Call us at 561 459 4876
Find more information at our website
www.hydrologicalusa.com