Gullies inventory based on Google Earth PRO anaglyph images from Conceição da Barra de Minas, Minas Gerais, Brazil.
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Gullies are erosive features developed through water erosion processes, which combine runoff and subsurface water flow, which can mobilize great volumes of soil and cause severe impacts to both rural and urban areas. The south of Minas Gerais (Brazil) has been affected by soil degradation due to gullying, especially in Nazareno and Conceição da Barra de Minas. It is essential to assess the already eroded areas to obtain information on environ mental conditions and deflagrant agents that dominate in the study area. Considering the lack of data in Conceição da Barra de Minas and the inexistence of a gully inventory in this municipality, we used anaglyphs of satellite images from 2023 and 2024 to identify and delimit gullies in 103 cells of 2,000 x 2,000 meters, which were compared with hypsometry, slope, geology, soils, watershed, and land use and land cover maps. The inventory identified 238 gullies, with an area of 727.63 ha. Most gullies were concentrated in the south of the study area, especially in the Palmital stream watershed. These features are situated in altimetric ranges between 940 and over 1,000 meters, occurring on slopes varying from 3 – 8% to 20 – 45%. The gullies are primarily associated with lithologies of the Cassiterita orthogneiss, Represa de Camargos metagranodiorite, and the Nazareno Formation. They develop within Cambisols and red-yellow Oxisols, often near to water springs, and are spatially correlated with regions used for temporary agriculture and pasture activities. These new insights provide tools to both avoid and recover eroded areas in Conceição da Barra de Minas.
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Erosion, Degraded areas, Environmental cartography