Resumo:
In rapidly growing urban areas of developing countries, inappropriate urbanization practices near water bodies lead to signifcant environmental degradation, including deforestation, soil impermeabilization, and direct waste discharge into rivers and streams. This not only compromises water quality and ecosystem health but also exacerbates food risks for nearby communities. Dumpsites, common in these regions due to inadequate waste management infrastructure, pose signifcant environmental threats, including soil and groundwater contamination. Our study employed a frequencydomain electromagnetic survey on an inactive dumpsite adjacent to one of Brazil’s major rivers. This geophysical method provided critical insights for geoenvironmental investigations, facilitating the collection of soil and groundwater samples to understand leachate behavior. We found that the shallower electrical conductivity map aligned with the waste disposal area’s boundaries, verifed by on-site surveys and excavations. Historical aerial images supported this interpretation and helped explain conductive electrical anomalies in the deeper conductivity map, linked to old irregular housing and waste disposal around the dumpsite. Moreover, the electrical conductivity maps revealed NE-oriented percolation at depth in the study area. Groundwater monitoring wells and soil analyses identifed chemical elements exceeding standards set by Brazilian and international environmental agencies in this fow direction. These fndings highlight the importance of using investigation techniques with superior spatial resolution compared to traditional environmental monitoring approaches. Electromagnetic methods prove efective in enhancing understanding and management of contamination in dumpsite environments.
Referência:
GUIRELI NETTO, Leonides; GUIMARÃES, Camila Camolesi; BARBOSA, Alexandre Muselli; GANDOLFO, Otávio Coaracy Brasil. Investigation of the contamination behavior in water and soil of na inactive dump from chemical analysis and geophysical method. Discover Geocience, v.2, n.8, 14 p., 2024.
Acesso ao artigo no site do Periódico:
https://link.springer.com/article/10.1007/s44288-024-00010-8
