Avaliação de ambientes de mangue e praia/ilha-barreira quanto a contaminação por material de empréstimo através de análises estatísticas, Macau-RN
The use of loan material (sand and gravel) in the construction of the Serra Oil Field’s roads and bases arises the possibility of textural and compositional alteration of mangrove and beach environments located within reach of coastal forces. The Serra Oil Field is known to be a coastal erosion hots...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/34361 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | The use of loan material (sand and gravel) in the construction of the Serra Oil Field’s roads and bases arises the possibility of textural and compositional alteration of mangrove and beach environments located within reach of coastal forces. The Serra Oil Field is known to be a coastal erosion hotspot in the Rio Grande do Norte coast, locations where coastal forces (waves and tidal currents) work on an intensely way, hence arising the possibility of erosion of those materials, and its subsequent transport and deposition in mangrove and beach zones. To assess the impact of a possible alteration by the loan material a field study was conducted in the area in which core samples were collected in both beach and mangrove environments. In this study, a total of eight areas are selected, being four mangrove areas and four beach areas, three areas with possible alteration and one standard area for comparison for each environment. In each environment there are three core drillings, making a total of 24 core samples, which in turn are grouped in four equidistant ranges for sampling in order to do lab analysis, which resulted in 93 samples, since three core drillings (CM2B, CM3A and CPrI3B) could not reach 1 meter depth, therefore, only three samples were retrieved. The results of the lab’s analysis of those samples generated the data used for the statistical assessment which is the scope of the present work. The data are organized into three categories for a better understanding of the alteration level provided by the loan material: granulometric variables, compositional variables, and geochemical variables. The granulometric variables refer to the phi proportions of sorting degree and granulometric median, as well as the percentages of gravel, VCCM (very coarse, coarse and medium) sand, VFF (very fine and fine) sand and clay. The compositional variables comprise the percentages of siliciclastic and carbonate sediments, organic matter, rock fragments, heavy minerals, and quartz. The geochemical variables comprise the amounts of the elements uranium, thorium, and potassium expressed in parts per million (ppm). Besides that, the coregama unit assesses the samples’ granulometry. The statistical assessment consists of a descriptive statistics stage with the making of statistical summaries for the two analyzed environments considering arithmetic mean, median, minimum value, maximum value, standard deviation, coefficient of variation, and skewness. The vertical profiles produced within the assessment verify the variables pattern with depth, in addition to, the box plots analyze the data variability in each area. The statistical assessment also consisted of nonparametric testing through the Kruskal-Wallis and multiple independent samples comparison tests aiming to identify one or more different areas from the rest through discrepancy detection among the distribution of the variables on these locations. The inferential stage of the statistical assessment consisted in the integrated interpretation of the results and from that stage the conclusion is that the loan material texturally and compositionally does not alter both the mangrove and beach areas, once they do not present enough traces despite the early suspicion about CPrI1 and CM2. |
|---|