1,720,954 research outputs found
Proposta metodológica para análise de vulnerabilidade da orla maritma à erosão costeira : aplicação em praias arenosas da costa sudeste da Ilha Santa Catarina (Florianópolis, Santa Catarina-Brasil)
Get PDFA vulnerabilidade da linha de costa à erosão costeira é relativa a fatores geológicos, geomorfológicos, oceanográficos, entre outros, os quais operam em diversas escalas de tempo. No presente trabalho foi construída uma proposta metodológica para analisar a vulnerabilidade de cinco praias localizadas na costa sudeste da Ilha de Santa Catarina (Florianópolis-SC). Tal proposta apóia-se em: i- medições da linha de costa em escalas interanual e interdecadal, trazendo para o contexto a hipótese de que a linha de costa responde de forma distinta aos agentes processuais como ondas, correntes e marés, conforme a escala temporal sob análise, e ii - na determinação de células costeiras e de deriva litorânea, no sentido de que estas representem unidades homogêneas e fundamentais para aplicações em gerenciamento costeiro. A posição da linha de costa foi analisada através de aerofotos dos anos de 1938, 1978, 1994, 1998 e 2002, em ambiente de Sistema de Informação Geográfica (SIG), enquanto que na determinação das células foram utilizados dois métodos: diagramas de refração/difração de ondas e morfo-textura praial. Os limites das células permitiram seccionar a linha de costa e obter unidades homogêneas para a aplicação de índices de vulnerabilidade, tendo sido adotado o conceito de unidade de orla marítima. Na análise de vulnerabilidade foram utilizadas oito variáveis, as quais foram comparadas quanto a sua correlação com as taxas de variações da linha de costa interanual e interdecadal. Tal comparação foi realizada por agregação linear e possibilitou a obtenção de 3 índices de vulnerabilidade costeira , índice interanual, interdecadal e geral. A análise de risco incluiu a variável de elevação do nível do mar e o risco de danos a edificações na faixa de orla marítima. Entre escalas, percebeu-se que, numa mesma praia, as respostas da linha de costa são diferentes, sendo que muitas variações em escala interanual são absorvidas pela dinâmica temporal maior expressa em taxas interdecadais. Foram identificadas 26 células costeiras, as quais exibem limites divergentes, convergentes e pulsantes, denotando as unidades de orla marítima. De forma geral, existe tendência à erosão costeira da ordem de 0,30m/ano, porém, para fins de análise de vulnerabilidade, devem ser consideradas a contribuição das variáveis em cada escala , bem,como suas relações numa mesma praia. Por outro lado, As variáveis que tiveram maior importância foram a inclinação da antepraia e a altura de ondas, sendo que as demais variaram, em importância, conforme a escala sob perspectiva. A utilização de diferentes índices de vulnerabilidade permitiu avaliar este trecho da linha contemplando diferentes processos como recuperação da praia pós eventos de alta energia, tendências de erosão costeira, elevação do nível do mar, além de considerar o risco de uso e ocupação da orla marítima.. Deste modo, a estrutura da metodologia pautada em unidades de orla marítima (relacionadas ao balanço sedimentar), e na consideração de diferentes escalas temporais propõe uma aproximação com ações diversificadas e efetivas de Planejamento e Gerenciamento Costeiro.The coastal vulnerability to coastal erosion depends on several factors that varies at time scales. At this study the goal was develop a methodological proposal to analyze coastal vulnerability of five beaches placed at southeast shore of Santa Catarina Island (Florianópolis-SC-Brazil). It’s based on: i- shorelines position measurements in interdecadal and interannual scales, which highlighted the different responses from shorelines to coastal process; ii- Coastal and drift cells determination, which representing homogeneous unities to coastal management applications. The shoreline position was measured using aerial photography sets from the years: 1938 to 2002, using Geographical Information Systems (GIS), and the coastal and drif cells was studied with two methods: Diagram of wave refraction/diffraction obtained by MIKE 21 PMS modelling software, and a set of beach sampling profiles to analysis the morphological and sediments texture characteristics. The boundary between the coastal cells divide the shoreline in stretch representing homogeneous unities, to be used in vulnerability and risk analysis. Eight variables was correlated and compared with both interannual and interdecadal rates of shoreline change to compose the vulnerability analysis. The linear aggregation was used to compare the correlated data among variables and the shorelines rates resulting in three vulnerability indexes. The risk analisys includes an sea level rise prediction to year of 2090 and the damages of buildings placed at aseashore areas. There are different responses from shorelines from each time scales, occurring, in general, the shoreline changes relative interannual scale being absorbed by the changes happened in interdecadal scales. It was identified 26 coastal cells with different boundaries types between them like convergent , divergent and pulsatory denoting the aseashore unities. at general, there is a trend of coastal erosion about 0,30 m/year of magnitude, but, must be considered the variables contribution at time scales variation. The most important variables was the shoreface slope and height of wave breaking, and the others varying in importance according to time scale analyzed. The utilization of different vulnerability index turns possible the multi scale process analysis, considering the vulnerability to as beach recovery due storms, coastal erosion trends, sea level rise, and considering the human uses and occupation risks
ASPECTOS GEOMORFOLÓGICOS DA BAÍA DA BABITONGA, SANTA CATARINA , BRASIL: CARACTERIZAÇÃO MORFOMÉTRICA
Get PDFA Baía da Babitonga é um complexo estuarino situado no litoral norte de Santa Catarina, Brasil, sendo um dos ecossistemas costeiros mais representativos do estado. No entanto, estudos de geomorfologia representam uma lacuna de informação e conhecimento. O presente estudo buscou realizar sua caracterização morfométrica, a partir de análise hipso batimétrica e de perfis transversais batimétricos da Baía, em ambiente de Sistema de Informação Geográfica. As cotas batimétricas mais expressivas em extensão tiveram associação com feições mostradas nos perfis, gerando cinco tipologias de feições: planícies de maré, bancos sublitorâneos, terraços submarinos, lajes rochosas e canais. Tal caracterização corrobora com a classificação de estuário de vale afogado e ressalta a importância do retrabalhamento fluvial e marinho ao longo do Quaternário Superior, bem como da morfodinâmica recente que está associada à morfogênese de áreas mais rasas
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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