Navegando por Autor "SILVA, Benedito Evandro Barros da"

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Acesso aberto (Open Access)
Análise dos impactos das diferentes formas de ocupação da superfície sobre as condições meteorológicas na região de Santarém, Pará
(Universidade Federal do Pará, 2011-08-26) SILVA, Benedito Evandro Barros da; GANDU, Adilson Wagner; http://lattes.cnpq.br/8491359374260645
This dissertation aimed to get information concerning the use and occupation of soil in the region of Santarém, in different years in the last decades, to show the effects caused by changes of surface properties on the atmospheric conditions simulated by weather and climate numerical models. The land surfaces are characterized by causing substantial effects on the atmosphere and thus influencing the quality of weather and climate forecasts. On the other hand, deforestation contributes to climate change by eliminating large amounts of greenhouse gases into the atmosphere. These activities also cause effects on public health, agriculture, forest resources, wildlife resources, and water resources. In addition, replacement of natural surface by pasture or agriculture modifies the thermal and radioactive properties of the surface, generating changes in local, regional and global atmospheric conditions. In this paper representative periods of possible climate change in the region were analyzed, identified by treatment and statistical analysis of climatologic data from surface weather stations, as well as time and quantitative evolution of deforestation in the study region with data from Project PRODES (Monitoring of Brazilian Amazon Rainforest by Satellite). The evaluation of the atmospheric effects on changes in land use and occupation was based on IBGE vegetation map, and the inclusion of class "deforestation" analyzed in different periods (1997 and 2009) worked on the software Arc. Gis. 9.2. Data files of surface types compatible with the reading of the BRAMS model were created. The BRAMS model was used to simulate the different effects of land use thematic maps in the local atmosphere. The results indicate a trend of increase in average rainfall and frequency of days with precipitation, decrease in average temperature of maximum and increase in average temperature of minimum over years in the region of Santarém. The study area by the year 1997 registered 19.44% deforestation and by the year 2009 it rose to 25.54%. The simulations with the generated files of land use and occupation in 1997 and 2009 showed little variation for different thematic maps in the variables (temperature, humidity and flows of sensible and latent heat) when considering the average values of the total area simulated. However, when small areas located only on the regions suffering the largest changes are taken into account, there are major influences as deforestation increases.
Acesso aberto (Open Access)
A Descentralização e a gestão ambiental municipal no Estado do Pará, Brasil
(Universidade Federal do Pará, 2019-04-04) SILVA, Benedito Evandro Barros da; AZEVEDO-RAMOS, Claudia; http://lattes.cnpq.br/1968630321407619
The state of Pará has made a major effort to decentralize its environmental management, although the lack of mechanisms to monitor and evaluate this process undermines the transparency, monitoring and improvement of the decentralization policy. Therefore, this study aimed to analyze municipal environmental management in the state of Pará from the analysis of decentralization policies and municipal performance in environmental management. The history of the policies was carried out through documentary analysis and the legal framework. The performance was evaluated based on the development of a municipal environmental management performance index (iGAM) and the perception of local public agents on the environmental management of their municipality. The methodology was applied to 143 municipalities in Pará and the performance of the municipal environmental management was evaluated for the year 2009 and 2015. The perception of the agents on the management was evaluated through a questionnaire with a 5-point Likert scale applied to two groups of environmental technicians belonging to municipalities with “good” and “poor” performance in management. The results showed that the decentralization of environmental management had its greatest evolution since the year 2009, motivated by public policies and strong pressures to reduce deforestation, however, they lack mechanisms to monitor the quality of environmental management. The iGAM, characterized by land use change variables, which explained more than 70% of the total variance, categorized the municipalities into four performance classes (good, fair, bad and very bad), which were shown in maps. Between 2009 and 2015, there was some improvement in the performance of municipalities. However, the decentralization measures seem to be more political than environmentally effective, since only 21.7% of the 143 municipalities were classified as having good environmental management in 2015. Municipalities in eastern Pará had the poorest management performance in both periods, illustrating regions where unsustainable and misguided national policies have been fostered since the 1970s. In general, iGAM was positively affected by factors such as population, communication and protected areas in municipalities and negatively affected by rural credit, GDPm and rural environmental cadastre. Public agents, with more optimistic perceptions than reality, tended to qualify management differently than expected from empirical data, suggesting the need for mixed monitoring. The variables associated with changes in land use were also key to differentiate the perception of agents from different groups. A cost-effective monitoring of agents’ perceptions by public environmental agencies could focus on the variables that actually differentiate them in terms of perception: degraded area, secondary vegetation, abandoned pasture, deforested area; pasture area; rural credit and rural environmental cadastre. There is still a lot of room for improving the effectiveness of municipal environmental management in Pará. However, it is important to note that many policies with a profound impact at the municipal level are elaborated at higher hierarchical levels and, therefore, responsibility must be shared. The monitoring of environmental management in a synergistic way is as important as it is indispensable to improve the performance of municipalities by enabling the different levels of state public administration to evaluate, plan, monitor, implement and guarantee development in order to preserve environmental quality in the Amazon.