Assessment of wet snow dynamics on the territory of Urupema, Brazil based on SAR and optical satellite data

摘要

Climate components are closely related to one of the most dynamic elements of the Earth's surface, such as wet snow. Itis an element which influences most of the flood-related models. The subject of the research is a specific event registeredon 10/07/2018 in Urupema, the wet snow, which remained for only a few days. Urupema is a Brazilian city with anaverage annual temperature of 13C, located in the southern part of Santa Catarina and heavy winters regularly bringfrost, snow and frozen water in the area.The aim of the study is to demonstrate different approaches for short-lived snowcoverage monitoring based on SAR and optical satellite data. The subject of the study is to demonstrate the dynamics fora short period of time. The results obtained are data in the form of thematic maps showing the spatial reflectance of wetsnow and its dynamics over time. A methodology based on SAR and optical satellite data for wet snow exploration hasbeen developed. The methodology was applied to the city of Urupema. Brazil includes a wide range of meteorologicalconditions on a large area and diversified relief, which is why there is no optical data with good quality. This requiresthe use of SAR data that has the advantage over the visible and NIR ranges. Various spectral indices and indicators,calculated on a Sentinel database in Copernicus have been used. Results have been obtained for the dynamics of theparticular region over a given time period.