Erosão praial por sdesorganização de drenagem: Exemplos no litoral norte do Estado de São Paulo (sudeste do Brasil)

Por seu condicionamento geológico‐geomorfológico, suas características climáticas tropicais a sub‐tropicais, com temperaturas amenas e vegetação exuberante, e por sua proximidade com importantes centros urbanos, o litoral norte do estado de São Paulo (Sudeste do Brasil) vem, há décadas sofrendo uma intensa modificação em sua paisagem. Este trecho do litoral brasileiro caracteriza‐se por intenso recorte, determinado pela proximidade da Serra do Mar com relação à linha de costa, e em cujas reentrâncias desenvolvem‐se pequenas planícies arenosas, normalmente com cobertura sedimentar holocênica. Em função deste controle morfo‐estrutural, as redes de drenagem são restritas, assim como o aporte sedimentar, que adquire caráter episódico, determinado pelo regime de pluviosidade desigual, característico da região

Evolução da linha de costa e morfologia atual do Delta do Valo Grande, Litoral Sudeste do Brasil

O sistema estuarino‐lagunar de Cananéia‐Iguape, localizado no sul do Estado de São Paulo, sudeste do Brasil, encerra um complexo de canais, associados a uma planície costeira, cuja evolução data dos eventos transgressivo‐regressivos do Quaternário superior e cujos processos sedimentares recentes foram dramaticamente alterados em função da atividade antrópica, nos últimos 150 anos, determinada, basicamente, pela abertura de um canal artificial, o Valo Grande. Uma análise de documentos cartográficos, dos últimos 100 anos (Commissão Geographica e Geologica do Estado de S. Paulo, 1914; Freitas, 2005; Nascimento Jr et al., 2008), além de imagens de satélites, revela que, após a abertura do Valo Grande, houve uma enorme intensificação no processo sedimentar de parte do sistema lagunar, em função, não somente da erosão das margens do canal artificial mas, também, por conta do aumento expressivo sedimentos para o sistema estuarino‐lagunar, levando à formação de um “delta intra‐lagunar antropogênico” (“man‐made intra‐lagoonal delta”) cuja evolução e morfologia atual estão sendo investigados.

Valoración ecológica del Área Marina Protegida de la Bahía de Murdeira, Isla de Sal, Cabo Verde

Programa de doctorado: Ecología y Gestión de los Recursos Vivos Marinos

El corte de Puerto Real y el problema del límite plio-pleistoceno en la Bahía de Cádiz

[ES] Alrededor de la Bahía de Cádiz, los depósitos marinos de la regresión del Plioceno superior, forman una orla más o menos continua que se extiende hasta las proximidades de Chipioja al N., hasta Chiclana al S., constituyendo la Sierra de San Cristóbal el límite más oriental de la misma. Una cantera situada a 1,5 km al NE. de Puerto Real (lat. 36' 32' 15", long. 2' 28' 40". H.M.T.N. 1 : 50.000 núm. 1062), ofrece un amplio corte donde es posible observar los tramos marinos y salobres regresivos, así como los depósitos cuaternarios, continentales, más antiguos observados en el litoral gaditano. Se realiza un estudio detallado de dicho corte, y se discute el problema del límite Plio-Pleistoceno en dicho sector.

Modeling Features at Runtime

A feature represents a functional requirement fulfilled by a system. Since many maintenance tasks are expressed in terms of features, it is important to establish the correspondence between a feature and its implementation in source code. Traditional approaches to establish this correspondence exercise features to generate a trace of runtime events, which is then processed by post-mortem analysis. These approaches typically generate large amounts of data to analyze. Due to their static nature, these approaches do not support incremental and interactive analysis of features. We propose a radically different approach called live feature analysis, which provides a model at runtime of features. Our approach analyzes features on a running system and also makes it possible to grow feature representations by exercising different scenarios of the same feature, and identifies execution elements even to the sub-method level. We describe how live feature analysis is implemented effectively by annotating structural representations of code based on abstract syntax trees. We illustrate our live analysis with a case study where we achieve a more complete feature representation by exercising and merging variants of feature behavior and demonstrate the efficiency or our technique with benchmarks.

Analyzing Software Evolution through Feature Views

Features encapsulate the domain knowledge of a software system and thus are valuable sources of information for a reverse engineer. When analyzing the evolution of a system, we need to know how and which features were modified to recover both the change intention and its extent, namely which source artifacts are affected. Typically, the implementation of a feature crosscuts a number of source artifacts. To obtain a mapping between features to the source artifacts, we exercise the features and capture their execution traces. However this results in large traces that are difficult to interpret. To tackle this issue we compact the traces into simple sets of source artifacts that participate in a feature's runtime behavior. We refer to these compacted traces as feature views. Within a feature view, we partition the source artifacts into disjoint sets of characterized software entities. The characterization defines the level of participation of a source entity in the features. We then analyze the features over several versions of a system and we plot their evolution to reveal how and hich features were affected by changes in the code. We show the usefulness of our approach by applying it to a case study where we address the problem of merging parallel development tracks of the same system.

Capturing How Objects Flow At Runtime

Most of today's dynamic analysis approaches are based on method traces. However, in the case of object-orientation understanding program execution by analyzing method traces is complicated because the behavior of a program depends on the sharing and the transfer of object references (aliasing). We argue that trace-based dynamic analysis is at a too low level of abstraction for object-oriented systems. We propose a new approach that captures the life cycle of objects by explicitly taking into account object aliasing and how aliases propagate during the execution of the program. In this paper, we present in detail our new meta-model and discuss future tracks opened by it.