Suscetibilidade a Erosão dos Solos da Bacia Hidrográfica Lagos – São João, no Estado do Rio de Janeiro – Brasil, a partir do Método AHP e Análise Multicritério (Susceptibility to Erosion of Soils of the Lagos - São João Basin, in the State of Rio de Janeiro - Brazil, from the AHP Method and Multicriteria Analysis)

Abstract

A erosão dos solos é um problema muito comum em áreas tropicais como o Estado do Rio de Janeiro (Brasil). Este estudo teve como objetivo elaborar um mapa de suscetibilidade à erosão dos solos por meio de uma análise multicritério apoiada na Análise de Processos Hierárquicos (AHP) na bacia Lagos – São João. O mapa elaborado ao final do estudo evidenciou que as áreas centrais da referida bacia possuem alta suscetibilidade à erosão. Para a validação deste mapeamento foi utilizada as estatísticas kappa e a correlação de Pearson com valores de 0,8 e 0,7 respectivamente. Com objetivo de auxiliar a tomada de decisão para um melhor planejamento da área de estudo, foi elaborado um diagnóstico da erosão dos solos – estado atual, que mostrou que 30% da bacia já apresenta sinais de erosão severa e muito severa. A B S T R A C TSoil erosion is a very common problem in tropical areas such as the State of Rio de Janeiro (Brazil). The objective of this study was to elaborate a map of soil erosion susceptibility by means of erodibility, erosivity, slope, geomorphology and soil use data, using the multi-criteria analysis, based on Hierarchical Process Analysis (AHP), in a basin in the state of Rio de Janeiro, the Lagos - São João basin. The map elaborated at the end of the study showed that the central areas of the basin are more susceptible to soil erosion. For the validation of this mapping, the kappa statistics and the Pearson correlation with values of 0.8 and 0.7 respectively were used. In order to help decision making for a better planning of the study area, a diagnosis of soil erosion - current state, defined in five stages was elaborated, where it was observed that about 30% of the basin already shows signs of severe erosion, corresponding to stages 4 and 5 defined in the study.Keywords: Erosion; São João Basin; AHP

Effects of Land Use and Cropping on Soil Erosion in Agricultural Frontier Areas in the Cerrado-Amazon Ecotone, Brazil, Using a Rainfall Simulator Experiment

“…In addition to minimizing soil losses, these initiatives contribute to increasing carbon stocks, conserving the biodiversity of biomes, and preserving rivers and lakes from the silting up caused by constant erosion processes [2]. The soil's ground cover, in addition to protecting against the direct impact of raindrops, also protects agroecosystems from wind erosion and solar rays, which affect the soil microbiology [54,55]. From 2009 to 2020, Brazil made progress in achieving the goals of establishing policies for the conservation of natural resources, with a focus on reducing climate change [56].…”

Analytic hierarchy process (AHP) applied to flood susceptibility in São José dos Campos, São Paulo, Brazil

“…The use of a multicriteria analysis method is recent in Brazil, and has been applied mainly to environmental problems which, due to the possibility of using specific criteria for each analysis, the application of the AHP method can be found in several studies, among them: geoenvironmental (Santos et al, 2007), risk of landslides (Faria et al 2016;Meirelles et al, 2018), socio-environmental vulnerability (Marques et al, 2018) and susceptibility of soil to erosion (Santos et al, 2019).…”