Navegando por Assunto "Vulnerabilidade ambiental"

Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise da vulnerabilidade ambiental da sub-bacia do Jaurucu – Brasil Novo Pará
(Universidade Federal do Pará, 2022-08-29) FREITAS, Jaylim Reis de; VELOSO, Gabriel Alves; http://lattes.cnpq.br/9757471213923099; https://orcid.org/0000-0002-3655-4166
The overall objective of this study is to analyze the environmental vulnerability of the Jaurucu sub-basin and to understand how land cover and land use changes between 1990 and 2020 affect the loss of its landscape potential and its geoecological and socioeconomic features, including the pattern of encroachment of environmental systems. . , possibilities and limits of use and the impact on spatial changes. To achieve the desired goals, the theoretical and methodological foundations of the earth system approach, the theory of ecological dynamics, the concepts of landscape, land system and stability of the environmental system were chosen; The concepts of risk and vulnerability were introduced to avoid confusion when understanding these concepts. The research used techniques and methodological procedures as theoretical and methodological support for mapping environmental systems, assumptions by Bertrand (2004), Sotchava (1977), Tricart (1977), Monteiro (2000), Souza (2000) and others. The cartographic products were created with the support of geographic information systems (GIS). The environmental vulnerability analysis was adapted by applying the methodology of Crepani et al. proposed method. Persons. (2001), Grigio (2003), Tagliani (2003), Costa et al. (2006), Oliveira and Mattos (2014), based on Tricart (1977). Field work has been performed to verify the generation of land cover and land cover maps using MapaBiomas, vulnerability determinations are calculated using the grid calculation tool from algebraic equations crossing data in the GIS environment. Therefore, creating a sustainable development plan requires planning and analysis of the environment. Understanding vulnerable environments and the systems used within them helps with territory planning.
Acesso aberto (Open Access)
Unidades geoambientais da ilha do Atalaia: uma contribuição para o planejamento ambiental do município de Salinópolis-PA
(Universidade Federal do Pará, 2021-02-23) SARMENTO, Jane Carla dos Santos; PAULA, Eder Mileno Silva de; http://lattes.cnpq.br/8647718165947306; https://orcid.org/0000-0002-6895-2126; PIMENTEL, Márcia Aparecida da Silva; http://lattes.cnpq.br/3994635795557609; https://orcid.org/0000-0001-9893-9777
The delimitation of geoenvironmental units enables knowledge of the potential and limitations of the studied physical environment, through the integration of the constituent components of the landscape, pointing out guidelines that minimize and / or avoid negative environmental impacts, subsidizing environmental planning. The objective of this research is to carry out the mapping of the Geoenvironmental Units of the Atalaia Island located in the municipality of Salinópolis PA. This island was chosen because of the significant socio-environmental changes that are currently taking place in this area, which makes it possible to perceive the negative impacts, especially in vulnerable environments, where there are contrasts in the way of using and occupying land, in urban expansion, in agricultural activities and in tourist intensification. In order to arrive at the result of the research, bibliographic surveys, Geoprocessing and remote sensing techniques were used, analysis of satellite images, fieldwork, necessary for the observation in locus and the crossing of the information obtained, which resulted in the map of Geoenvironmental Units. In this way, it was obtained the definition of four homogeneous units according to the potentialities and limitations to the processes of the physical environment and the indiscriminate use of these environments. These units were found from information on secondary materials, essential for the elaboration of the Geoenvironmental zoning proposal of the study area, which serves as a contribution in the elaboration of future plans, as well as for the purposes of rational exploration of natural resources and sustainable use in Atalaia island.
Acesso aberto (Open Access)
Vulnerabilidade ambiental e impacto na produção de sedimentos da bacia hidrográfica do rio Itacaiúnas (BHRI) - Província Mineral de Carajás, Sudeste da Amazônia
(Universidade Federal do Pará, 2022-06-30) SILVA, Marcio Sousa da; SOUZA FILHO, Pedro Walfir Martins e; http://lattes.cnpq.br/3282736820907252; HTTPS://ORCID.ORG/0000-0003-0252-808X; ROCHA, Edson José Paulino da; http://lattes.cnpq.br/2313369423727020
The development of environmental vulnerability studies in a regional context and in particular in the Amazon requires a huge human, logistical and economic effort, which when incorporated into current technologies for data acquisition and processing (remote and in situ) and publicprivate partnerships, makes such research possible. This framework was what enabled the development of this thesis in the Itacaiúnas River Watershed (IRW), which has around 42.000 km² and is located in the area called “arc of deforestation in the Amazon”. Area of many socioeconomic-environmental conflicts related to the development of the region and its different types of use and occupation of the territory. Within this context, we developed this research whose main objective was to assess how environmental vulnerability relates to the current production of suspended sediments at the IRW. First, the areas of greater or lesser vulnerability were defined and identified, having the year 2019 as a timeframe, through recognized methodologies developed for this type of study in the Amazon region. Using geoprocessing routines in ArcGIS 10.8.1 software, five thematic maps and environmental vulnerability were built (geology, geomorphology, soils, use and occupation and climate) and finally using map algebra the map of BHRI's environmental vulnerability was generated. The results showed that the BHRI is moderately stable/vulnerable in an area of 28,058 km² of extension (68% of the basin), moderately stable in 8,961 km² of extension (with 22% of the basin) and moderately vulnerable in 4,314 km² (10% of the basin). of the basin). In parallel, the study on the production of sediments at the BHRI, was based on data acquired by the hydrometeorological monitoring project by the Instituto Tecnológico Vale – ITV. Monitoring takes place in 16 hydrosedimentological control sections distributed in the six main sub-basins that make up the BHRI, with four annual campaigns (high water levels, rising water levels, falling water levels, low water levels) that took place between 2015 and 2019, and aimed at building and comparing the curves- sediment key and sediment production between these different sub-basins, data already published in the Brazilian Journal of Water Resources (RBRH) in 2021. Finally, seeking to respond to hypothesis of this study, we carried out comparative analyzes of the relationship between the environmental vulnerabilities observed and the production of sediments, identifying and demonstrating which areas, which environmental factors and how much sediment is produced in the different sub-basins of the IRW. The results obtained allowed to get an integrated and compartmentalized view of the vulnerability and production of sediments at the BHRI that confirm that the ongoing legal mineral activities within protected areas of forests do not generate significant impacts on their vulnerability or on their production of sediments. In turn, the activities related to the use and occupation of the territory in nonprotected areas, promoted an intense replacement of the forest by pastures, generating the areas of greater environmental vulnerability and are directly associated with the greater “inputs” of sediments in the IRW.
Acesso aberto (Open Access)
Vulnerabilidade ambiental e impacto na produção de sedimentos da bacia hidrográfica do rio Itacaiúnas (BHRI): província Mineral de Carajás, sudeste da Amazônia
(Universidade Federal do Pará, 2022-06-30) SILVA, Marcio Sousa da; SOUZA FILHO, Pedro Walfir Martins e; http://lattes.cnpq.br/3282736820907252; https://orcid.org/0000-0003-0252-808X; ROCHA, Edson José Paulino da; http://lattes.cnpq.br/2313369423727020
The development of environmental vulnerability studies in a regional context and in particular in the Amazon requires a huge human, logistical and economic effort, which when incorporated into current technologies for data acquisition and processing (remote and in situ) and publicprivate partnerships, makes such research possible. This framework was what enabled the development of this thesis in the Itacaiúnas River Watershed (IRW), which has around 42.000 km² and is located in the area called “arc of deforestation in the Amazon”. Area of many socioeconomic-environmental conflicts related to the development of the region and its different types of use and occupation of the territory. Within this context, we developed this research whose main objective was to assess how environmental vulnerability relates to the current production of suspended sediments at the IRW. First, the areas of greater or lesser vulnerability were defined and identified, having the year 2019 as a timeframe, through recognized methodologies developed for this type of study in the Amazon region. Using geoprocessing routines in ArcGIS 10.8.1 software, five thematic maps and environmental vulnerability were built (geology, geomorphology, soils, use and occupation and climate) and finally using map algebra the map of BHRI's environmental vulnerability was generated. The results showed that the BHRI is moderately stable/vulnerable in an area of 28,058 km² of extension (68% of the basin), moderately stable in 8,961 km² of extension (with 22% of the basin) and moderately vulnerable in 4,314 km² (10% of the basin). of the basin). In parallel, the study on the production of sediments at the BHRI, was based on data acquired by the hydrometeorological monitoring project by the Instituto Tecnológico Vale – ITV. Monitoring takes place in 16 hydrosedimentological control sections distributed in the six main sub-basins that make up the BHRI, with four annual campaigns (high water levels, rising water levels, falling water levels, low water levels) that took place between 2015 and 2019, and aimed at building and comparing the curves- sediment key and sediment production between these different sub-basins, data already published in the Brazilian Journal of Water Resources (RBRH) in 2021. Finally, seeking to respond to hypothesis of this study, we carried out comparative analyzes of the relationship between the environmental vulnerabilities observed and the production of sediments, identifying and demonstrating which areas, which environmental factors and how much sediment is produced in the different sub-basins of the IRW. The results obtained allowed to get an integrated and compartmentalized view of the vulnerability and production of sediments at the BHRI that confirm that the ongoing legal mineral activities within protected areas of forests do not generate significant impacts on their vulnerability or on their production of sediments. In turn, the activities related to the use and occupation of the territory in non protected areas, promoted an intense replacement of the forest by pastures, generating the areas of greater environmental vulnerability and are directly associated with the greater “inputs” of sediments in the IRW.