Abstract
Natural disasters associated with land mass movements in Brazil have become more frequent in recent years, with significant human loss and material damage. An alternative to reduce such natural disasters will occur when landslides-susceptible areas are mapped, with restrictions or conditions for the occupation of areas with natural fragility to landslide occurrences. Current analysis determines the slopes´ potential degree for the occurrence of landslide susceptibility in the Caeté catchment, municipality of Alfredo Wagner, in the highlands of the state of Santa Catarina, Brazil. The Shallow Stability model (SHALSTAB) identified the slopes´ instability index by hydrological factors, hillside stability and soil. Results revealed areas with high degree of hillside instability and the need for preventive and relieving actions. In fact, areas with very high potential fragility susceptible to the occurrence of mass movement in the Caeté catchment are more than 30% of the basin´s total area.
Highlights
Landslides, continuous natural phenomena that form landscapes, are the result of an association of hydrogeomorphic, geological and anthropologic factors
The results of topographic analysis with data obtained from the digital terrain model (DEM) show that the slopes are steep, mainly on the southern and southwestern sides of the Caeté catchment basin, especially at the headwaters of the Santo Anjo River (Table 3, Figure 7)
SHALSTAB simulation elaborated a map of areas susceptible to landslides in the Caeté catchment (Figure 8), where the stabilityinstability level is expressed by the ratio log(Q/T), taking into consideration a mean friction angle and a soil density of 33.6° and 1,400 kg m-3, respectively
Summary
Landslides, continuous natural phenomena that form landscapes, are the result of an association of hydrogeomorphic, geological and anthropologic factors. According to Guerra (1993), landslides may be defined as soil mass movement on a watersaturated foundation. They depend on several factors, such as the slope angle, rainfall intensity and frequency, vegetation cover, soil consolidation and others. The potential fragility to landslides occurrence is considered to be a natural vulnerability and depends on their physical characteristics such as slope, rainfall and soil type
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