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Search Results: 1 - 10 of 14787 matches for " Nelson Wellausen Dias "
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Ambiente & água in the context of impact indicators of scientific Brazilian journals
Nelson Wellausen Dias,Getulio Teixeira Batista
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2010,
Abstract: For quite some time the international scientific community has criticized the use of impact indicators based only on few journals registered at commercially subscribed databases such as the ISI Web of Knowledge (producer of Journal Citation Reports - JCR). Several studies focusing on different subject areas have demonstrated the advantages and disadvantages of assessing the impact of an article, or journal, from commercial and open-access databases, such as Google Scholar (Segen, 1997; Gisvold, 1999; DuBois and Reeb, 2000; Whitehouse, 2002; Baumgartner and Pieters, 2003; Cameron, 2005; Ha et al., 2006; Mingers and Harzing, 2007). Most of the studies found that there was a strong correlation between impact indicators measured by a commercial databases (restricted) and open-access in certain field areas (Science, Health, Biological and Applied Social), while areas usually with lesser coverage by commercial databases (Environment, Humanities, among others) end up having lower impact indicator values based on these commercial databases. Moreover, the number of publications in these last areas has shown a significant expansion recently and, therefore, they end up receiving greater impact scores when evaluated by open-access databases. In these cases the correlation between impact indicators calculated by restricted versus open-access database is significantly lower. In this exercise, developed to obtain impact values of various Brazilian scientific journals in international open-access databases, not only it could be demonstrated the role that the journal Ambiente & água withholds in the national scientific community (and even international if considered the information published in previous editorials), but also witnesses the degree of efficiency, transparency, and simplicity of the indicators used. The Editorial Board of the journal Ambiente & água stands in favor of using indicators that are transparent, simple, and free of charge in the process of assessing the impact of published articles and scientific Brazilian journals.
Scientific journals in the SciELO database, indicators of impact and the relative position of Ambiente & água
Nelson Wellausen Dias,Getulio Teixeira Batista
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2010,
Abstract: This editorial describes the process of periodic evaluation by CAPES, based on commercial indices proposed by companies such as the ISI FI by Thomson Reuters and SCImago by Scopus and public indices as proposed by SciELO and other freely calculated indices based on Google Scholar and investigates the impact position of the journal Ambiente & Agua compared with journals from the SciELO base. Results show that Ambiente & Agua is in the right path in the search for quality. Its editorial board strongly recommends that Brazilian public scientific agencies consider tools that are cost free and have large coverage for impact evaluation to allow the impact assessment of a range of emerging journals in a common and wide basis for all scientific journals.
Urbanization and runoff in the Tucunduba hydrographic basin, Belém, PA, Brazil
Marcelo dos Santos Targa,Getulio Teixeira Batista,Hélio Nóbile Diniz,Nelson Wellausen Dias
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2012,
Abstract: The present work investigated the runoff resulting from urban sprawl in the area of Tucunduba basin, in Belem, in the period between 1972 and 2006, which is characterized by a urbanization process started in the 1960s by low income population without adequate infrastructure services. Urbanization modifies the soil surface interfering on the ground phase of the hydrological cycle, inasmuch as it reduces the area of infiltration, increases runoff, and the runoff coefficient. A geographic database with land use and land cover map layers extracted from orthophotos acquired in 1972, 1977, and 1998 and a SPOT satellite image acquired in 2006 were used. Digital maps and analysis of the urbanization processes were supported by tools available in ArcGIS software package. To estimate the infiltration potential (S) and effective rainfall (Pe), as a function of rainfall duration equal to the maximum time of concentration of the water in the basin, Curve Number methodology proposed by the Natural Resources Conservation Service (NRCS) was applied. Rainfall estimates were calculated using the maximum rain equation for the city of Belém, with return times specified at 2, 5, 10, 15, 20, 25, 50, 100, and 200 years. The results showed an increase in areas of high and medium population density (urban) and reduced area of low population density (secondary forest growth) for the years of 1972, 1977, 1998, and 2006, that generated a higher effective precipitation value and, therefore, a higher effective runoff coefficient value (C).
Morphometric analysis of sub-basins Fojo and Perdizes in the city of Campos do Jord o, SP, Brazil
Agenor Micaeli dos Santos,Marcelo dos Santos Targa,Getulio Teixeira Batista,Nelson Wellausen Dias
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2012,
Abstract: The State of S o Paulo Water Resources Policy established, in 1991, the Integrated Water Resources Management System (SIGRHI) and defined the basic principles for water management, adopting the watershed as the basic unit for studies, integrated planning for sustainable development. This study characterized the morphology of sub-basins Fojo and Perdizes in the city of Campos do Jord o, SP. Morphometric analysis involved the characterization of geometric parameters, topography and drainage network, and the analysis of land use and land cover of the sub-basins. The morphometric characterization revealed that Perdizes sub-basin has an area of 12.70 km2, a perimeter of 19.85 km, and a main channel length of 6.86 km, while Fojo sub-basin has a drainage area of 13.97 km 2, a perimeter of 19.74 km, and a main channel length of 6.94 km. These results indicate similarities between the two sub-basins. The compactness coefficient (Kc) for Perdizes was 1.56 and for Fojo 1.41. These values associated with the respective form factors, F = 0.27 and F = 0.29, indicate that these sub-basins, under a normal precipitation regime are not susceptible to flooding. The results of these indices are consisted with the circularity index (CI) found: CI = 0.41 for Perdizes and CI = 0.45 for Fojo, respectively. As CI values found are far from one, they indicate that these sub-basins tend to have a more elongated shape and, therefore, lower flow concentration tendency. The results obtained for the maintenance coefficient indicate that in order to maintain the flow of each channel meter, Perdizes sub-basin needs 286.5 m2 and Fojo sub-basin needs 243.9 m2. Land cover and land use analysis revealed that among the four existing vegetation cover types, Forest is dominant in both sub-basins with 649 ha (51.1%) in Perdizes, and 608.8 ha (43.6%) in Fojo; Reforestation cover ranks second with similar areas in both sub-basins, Perdizes with 218 ha (17.2%) and Fojo with approximately 214 ha (15.3%). In terms of conservation, Fojo sub-basin can be considered better conserved with a smaller urban area, larger rangeland natural coverage area, and only slightly smaller forest coverage area than Perdizes.
Determination of priority areas for the re-establishment of forest cover, based on the use of geotechnologies
Celso de Souza Catelani,Getulio Teixeira Batista,Marcelo dos Santos Targa,Nelson Wellausen Dias
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2012,
Abstract: The determination of priority areas for the re-establishment of forest cover in watersheds is directly associated to the probability of effective success of restoration processes. However, considering the complexity of the analysis and the large amount of spatial data necessary to accomplish that purpose, state of the art technological tools capable of processing multi-criteria analysis to support decision making are necessary. Thus, the current work developed for an area of 476 km2 corresponding to the Una river watershed in the municipal district of Taubaté, SP, used a multi-criteria analysis based on the continuous classification and on Analytical Hierarchy Process (AHP) paired comparisons techniques, available in the complete GIS package named SPRING (Georeferenced Information Processing System) for generating a map of priority areas for the re-establishment of forest cover in that watershed. Results revealed a large area (26.6% of the entire watershed) falling in the “Extreme Priority” class for forest cover re-establishment, what indicates the urgent need of environmental recovery of this basin considering that it is used for Taubaté city water supply. Results from this research support the decision making for resource optimization applied to priority areas in an operational way.
Spatial distribution of Eucalyptus plantations in the S o Paulo State portion of Paraíba do Sul river basin, Brazil
Fernanda Viana Paiva Arguello,Getulio Teixeira Batista,Flávio Jorge Ponzoni,Nelson Wellausen Dias
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2010,
Abstract: This study assessed the evolution of the area planted to Eucalyptus, by municipality, in S o Paulo state in the river basin of the Paraíba do Sul from 2001 to 2007. The methodology of this study involved the identification and mapping of Eucalyptus in 2007 based on the analysis and interpretation of Landsat-5 TM imagery acquired in 2007 using the mapping produced by the Forestry Institute of S o Paulo (IF) for the year 2000 as a reference. Thus, a thematic map of the occurrence of Eucalyptus in 2007 was generated and overlaid on the boundaries of the municipalities that occurred in this watershed. Areal estimates of Eucalyptus plantations of each municipality were compared with data from the year 2001 and revealed an increase of 32.2% in the cultivated area in the region up to 2007. The results from 2007 were compared with data from a project LUPA from the Secretary of Agriculture of S o Paulo State also from 2007 and it was found a difference of only 1.4%, considering the set of all municipalities.
Hydrogeology and hydrodynamics of Tremembé aquifer, S o Paulo, Brazil
Helio Nóbile Diniz,Getulio Teixeira Batista,Nelson Wellausen Dias,Marcelo dos Santos Targa
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2008,
Abstract: This paper shows the results obtained from several pump tests of two wells drilled 13.2 meters apart, in the Agrarian Sciences Department of the University of Taubaté farm, located in the Una river hydrographic basin, Taubaté municipality, State of S o Paulo, Brazil. During well drilling some difficulties were encountered due to the presence of sandy grains without inter-granular cementation of the Tremembé Formation sandstones, Taubaté Group. The detailed description of the geologic profile obtained by sampling the perforated sedimentary layers shows the presence of persistent sandstone and conglomerate sequences, intercalated by layers of shale and claystone with limestone nodules. In order to determine the hydrodynamic parameters of the Tremembé aquifer, several pump tests were conducted during well perforation and the unconfined, leaky, water-table, and confined aquifer layers were sampled. Once the boreholes were completed, tests were conducted to determine maximum discharge rate, interference between wells and artificial recharge potential. In addition to establishing appropriated methodologies for the determination of aquifer hydrodynamics, this paper describes techniques for interpreting the effects of artificial recharge and interference between wells, and demonstrated the application of image well theory complemented with a new theory, the image well water-mirror.
Compensatory forestation for soil water retention in watersheds of Campos do Jord o municipality, SP, Brazil
Agenor Micaeli dos Santos,Marcelo dos Santos Targa,Getulio Teixeira Batista,Nelson Wellausen Dias
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2011,
Abstract: Compensatory forestation is an important technique to estimate the necessary forest cover for compensating the water loss due to surface runoff within a watershed and, therefore, guiding forest recovery interventions. The objective of this study was to quantify the forest area needed to compensate water loss caused by surface runoff in Fojo Creek and Perdizes Creek basin areas in the municipality of Campos do Jord o, SP, Brazil. Estimates were based on the Compensatory Forestation Methodology for Retention of Rainwater in Small Watersheds, which takes into consideration the average total annual precipitation, land cover and land use, the water infiltration capacity of soil, and an international recommendation indicating that 20.55% of the water in the hydrological cycle should infiltrate into the soil. These two watersheds have a total area of 2,666.6 ha that account for 9.3% of the municipal area of Campos do Jord o. The main land use and land covers in this area are: 1,257.9 ha of forest, 434.4 ha of urban area, 432.5 ha of commercial forest plantation, 265.1 ha of highland prairies, 126.8 ha of pastureland, and 149.9 ha of other classes. Water infiltration rate field experiment estimated a high rate (298 mmh-1) in forested areas, 289 mmh-1 in areas covered by commercial plantation, 94 mmh-1 in highland prairies, and 63 mmh-1in pasturelands. Based on the 20.55% infiltration recommendation of precipitated water, it was estimated that the total forest area required for these two watersheds to compensate for the runoff caused by the other land cover classes (prairies, pasture lands, reforestation plantations and urban areas) should be 1,318.1 ha (51,8%). Therefore, an additional 60.2 ha of recovered forest is needed to compensate for the loss of 1,096 million m3/year of water lost in theses watersheds.
Geospatial technology applied to the identification of groundwater recharge areas in northeastern S o Paulo, Brazil
Nelson Wellausen Dias,Hélio Nóbile Diniz,Marcelo dos Santos Targa,Getulio Teixeira Batista
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2009,
Abstract: Groundwater resource information is crucial for the establishment of protective measures by police makers and local managers. This article presents the findings of a research based on the application of remote sensing technology and auxiliary data for the identification of groundwater recharge areas in the Paraíba do Sul river basin, State of S o Paulo, Brazil. The objective of this study was to develop a series of georreferenced geologic information and a sequence of hydrogeologic analysis to determine the location and distribution of recharge areas for future conservation purposes. The results indicate the distribution of five categories of potential recharge areas based on lineament characteristics, fracture bundles, and fracture density analysis. The top three categories should be considered as having the higher percolation quality and infiltration capacity, therefore higher potential for groundwater recharge. Significantly different results were obtained for the two major portions of the study area, crystalline rocks and unconsolidated sedimentary material, this fact hampered the development of hydrogeologic correlations for the entire basin. Results may help policy makers and managers in the development and implementation of an aquifer protection zoning program and local community activities in environmental education and conservationist interventions.
Título da página electrónica: Or amento Participativo Portugal
Nelson Dias
Revista Crítica de Ciências Sociais , 2012,
Abstract: Uma página de entrada para a participa o A página www.op-portugal.org foi criada em Mar o de 2008, no ambito do projecto Or amento Participativo Portugal, apoiado pela Iniciativa Comunitária EQUAL (Employment, Social Affairs and Equal Opportunities). A interven o desenvolvida teve como objectivo geral disseminar o tema e a metodologia do Or amento Participativo (OP) a nível nacional, através da organiza o de ac es de forma o, workshops, encontros nacionais e consultoria para as autarquia...
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