Estudo da vulnerabilidade ambiental da barragem de Tapacurá pelo aporte natural do solo, zona da mata norte de Pernambuco, Brasil.

Abstract

Aprocess of use and occupation of the soils of hydrographic basins, it generates consequences as the increment of materials for the interior of the dam, thereby it is necessary to establish references about the current stage of contamination regarding the quality of the Sediments inside the Tapacurá Dam, which monitoring will allow a more systemic view of the area, regarding the excess or scarcity of some chemical elements, and serve as a geochemical and environmental study on the quality of the sediments present in this basin, aiming the construction of the EIA / RIME. The sediment samples were collected using a VAN VEEN dredger at predetermined points and destined to the laboratory, where the samples were prepared to follow for chemical analysis of the metals present in the sediments. As a first result, from the depths measured at each point, the map of the bathymetry of the Tapacurá basin was made. The toxicity of soil and sediment samples from the surrounding area of the dam was calculated from bibliographies serving as reference about the contribution of the elements to the basin. Finally, from the Enrichment Factor (EF) that was calculated using the Iron as normalizer element, it indicated that there is enrichment of Cadmium in all collected points distributed inside and outside the basin. However there are similarities between the values, it is not possible to confirm the origin of the change, making it necessary future studies that could recognize the nature of this element.