did you already have a look at the examples at ESA’s Sentinel-1 page?
https://sentinel.esa.int/web/sentinel/thematic-areas/land-monitoring/snow-and-ice
Not much information on it but could be a start: http://www.copernicus.eu/sites/default/files/documents/Copernicus_Briefs/Copernicus_Brief_Issue25_SnowMonitoring_Sep2013.pdf
Another case study: http://harmosnow.eu/workshops/18.04.2016,%20Vienna/20160418_SEN3APP_DissWS_Vienna_SnowProducts_Bippus.pdf