Maria Conceição Freitas
Dados Biográficos
| ID | 5646836 |
|---|---|
| NOME | Maria Conceição Freitas |
| PRENOMES | Maria Conceição |
| SOBRENOME | Freitas |
| ASSINATURA | FREITAS M C |
| AFILIAÇÕES | University of Lisbon |
| ORCID | 0000-0002-2616-6637 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 13 |
| TOTAL DE CITAÇÕES | 17 |
| TOTAL COMO AUTOR | 13 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1995 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2024 |
| ÍNDICE H | 3 |
Evolução natural holocénica e perturbação antrópica na foz da Ribeira de Alcântara, Estuário do Tejo (Lisboa)
Este trabalho tem como objetivo caracterizar a evolução ambiental e morfológica da margem estuarina na foz da Ribeira de Alcântara (Estuário do Tejo, Lisboa) durante o Holocénico médio e recente, através do estudo sedimentológico de sedimentos recolhidos em Alcântara durante os trabalhos arqueológicos que decorreram na obra Lote 9 – Loteamento de Alcântara Poente. Foi possível identificar cinco unidades sedimentológicas com diferentes característ…
One step from the deep ocean
Landscape change and vegetation history in the city of Lisbon during Roman times and the Early Medieval Period
Pollen and NPP analysis performed on the sedimentary deposits accumulated in the inter-tidal banks of the Tagus Estuary allow for the reconstruction of vegetation history and landscape changes that occurred in Lisbon from the 1st to the 6th century cal AD. The high chronological resolution of this investigation makes it possible to identify changes in human activities that took place during the Roman period and reveals the extent of land use in t…
The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)
Estuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accumulated between 3570 and 3240 cal. BP…
Holocene sea level and climate interactions on wet dune slack evolution in SW Portugal
We examine the Holocene environmental changes in a wet dune slack of the Portuguese coast, Poço do Barbarroxa de Baixo. Lithology, organic matter, biological proxies and high-resolution chronology provide estimations of sediment accumulation rates and changes in environmental conditions in relation to sea-level change and climate variability during the Holocene. Results show that the wet dune slack was formed 7.5 cal. ka BP, contemporaneous with …
Núcleo De Estudos E Pesquisas Em Educação E Trabalho - Nepet (Unb)
Instituído no ano 2000, o NEPET teve por finalidade introduzir e desenvolver a temática sobre as relações entre a Educação e o Trabalho, no âmbito da Faculdade de Educação da Universidade de Brasília. Filia-se a uma perspectiva que enfatiza a dialética dessa relação e que parte do entendimento de que o trabalho é o ponto de partida para a compreensão dos processos educacionais
Single events and century-scale evolution of the northern margin of the Tagus River before the Boavista landfill
In this work we present preliminary results of the study of one sediment core (EDP1), collected near Cais do Sodré, Lisbon downtown, close to the present day Tagus riverfront. The results allowed differentiation of 4 major sediment units that present a signature of increasing anthropic influence over time. The lowermost unit (Unit 1) corresponds to a subtidal flat accreting in low energy and brackish conditions. This sedimentation pattern is inte…
Onshore tsunami sediment transport mechanisms inferred from heavy mineral assemblages
The aim of this study is to discuss and to extend the characterization of (palaeo)tsunami deposits, and their source materials, based upon the detailed study of their heavy mineral assemblages. Results obtained from three distinct locations (Portugal, Scotland and Indonesia), different coastal contexts and chronologies (the tsunami events studied took place at 1500 cal. yr BP, AD 1755 and 2004) are summarized and discussed in order to contribute …
Modelação geológica do enchimento sedimentar Plisto-Holocénico da paleolaguna da Pederneira
A reconstrução paleoambiental das zonas húmidas litorais portuguesas constitui um elemento fundamental para o conhecimento da história evolutiva da zona costeira num passado geológico recente (Quaternário). Com a intenção de contribuir para o melhoramento do modelo de evolução da várzea da Nazaré (paleolaguna da Pederneira) durante o Plistocénico final e o Holocénico, procedeu-se à determinação da geometria e volumetria das unidades constituintes…
La ocupación paleolítica del Alentejo meridional
El proyecto de prospección de la cuenca del río Sado (SRDS), llevado a cabo entre el 2004 y el 2008, se diseñó para suplir la carencia de información concerniente al conocimiento actual de la Prehistoria de Portugal. Aunque la cuenca del río Sado conforma casi un tercio de la superficie continental de Portugal, aún no había recibido la debida atención para el Paleolítico. Antes de este proyecto, prácticamente nada se conocía acerca de la Prehisto…
Comparing historic records of storm frequency and the North Atlantic Oscillation (NAO) chronology for the Azores region
The storminess of the Azores region was investigated using newspaper records from AD 1836 onwards. The information obtained was rank-ordered for intensity and the time series of storm frequency analysed for interannual- to century-scale variability. The documentary data set was validated by comparison with objective cyclones intensity for the period AD 1958—2000. Results indicate that four periods of contrasting storm frequency are present (AD 18…
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 1
The sedimentological and geochemical study of a core corresponding to sedimentation in the Santo André lowland since 14 000 BP allowed the reconstruction of environmental changes of this area and discussion of the relative importance of local versus global forcing factors responsible for its evolution. The pre-Holocene section of the core represents terrestrial sedimentation in a fluviatile environment, contemporaneous of a low sea level and a di…
Tsunami sedimentation associated with the Lisbon earthquake of 1 November AD 1755
A description is given of a distinctive marine deposit at Boca do Rio on the Algarve coast of Portugal. It is proposed here that the sediment accumulation was deposited by the tsunami generated by the Lisbon earthquake of 1 November, AD 1755. The deposit exhibits sedimentary characteristics quite unlike other coastal sediment accumulations that are deposited by more moderate wave régimes. These include laterally continuous sand layers, chaotic pe…
La ocupación paleolítica del Alentejo meridional
El proyecto de prospección de la cuenca del río Sado (SRDS), llevado a cabo entre el 2004 y el 2008, se diseñó para suplir la carencia de información concerniente al conocimiento actual de la Prehistoria de Portugal. Aunque la cuenca del río Sado conforma casi un tercio de la superficie continental de Portugal, aún no había recibido la debida atención para el Paleolítico. Antes de este proyecto, prácticamente nada se conocía acerca de la Prehisto…
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 1
The sedimentological and geochemical study of a core corresponding to sedimentation in the Santo André lowland since 14 000 BP allowed the reconstruction of environmental changes of this area and discussion of the relative importance of local versus global forcing factors responsible for its evolution. The pre-Holocene section of the core represents terrestrial sedimentation in a fluviatile environment, contemporaneous of a low sea level and a di…
Tsunami sedimentation associated with the Lisbon earthquake of 1 November AD 1755
A description is given of a distinctive marine deposit at Boca do Rio on the Algarve coast of Portugal. It is proposed here that the sediment accumulation was deposited by the tsunami generated by the Lisbon earthquake of 1 November, AD 1755. The deposit exhibits sedimentary characteristics quite unlike other coastal sediment accumulations that are deposited by more moderate wave régimes. These include laterally continuous sand layers, chaotic pe…
The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)
Estuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accumulated between 3570 and 3240 cal. BP…
Landscape change and vegetation history in the city of Lisbon during Roman times and the Early Medieval Period
Pollen and NPP analysis performed on the sedimentary deposits accumulated in the inter-tidal banks of the Tagus Estuary allow for the reconstruction of vegetation history and landscape changes that occurred in Lisbon from the 1st to the 6th century cal AD. The high chronological resolution of this investigation makes it possible to identify changes in human activities that took place during the Roman period and reveals the extent of land use in t…
Holocene sea level and climate interactions on wet dune slack evolution in SW Portugal
We examine the Holocene environmental changes in a wet dune slack of the Portuguese coast, Poço do Barbarroxa de Baixo. Lithology, organic matter, biological proxies and high-resolution chronology provide estimations of sediment accumulation rates and changes in environmental conditions in relation to sea-level change and climate variability during the Holocene. Results show that the wet dune slack was formed 7.5 cal. ka BP, contemporaneous with …
Comparing historic records of storm frequency and the North Atlantic Oscillation (NAO) chronology for the Azores region
The storminess of the Azores region was investigated using newspaper records from AD 1836 onwards. The information obtained was rank-ordered for intensity and the time series of storm frequency analysed for interannual- to century-scale variability. The documentary data set was validated by comparison with objective cyclones intensity for the period AD 1958—2000. Results indicate that four periods of contrasting storm frequency are present (AD 18…
Tsunami sedimentation associated with the Lisbon earthquake of 1 November AD 1755
A description is given of a distinctive marine deposit at Boca do Rio on the Algarve coast of Portugal. It is proposed here that the sediment accumulation was deposited by the tsunami generated by the Lisbon earthquake of 1 November, AD 1755. The deposit exhibits sedimentary characteristics quite unlike other coastal sediment accumulations that are deposited by more moderate wave régimes. These include laterally continuous sand layers, chaotic pe…
Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 1
The sedimentological and geochemical study of a core corresponding to sedimentation in the Santo André lowland since 14 000 BP allowed the reconstruction of environmental changes of this area and discussion of the relative importance of local versus global forcing factors responsible for its evolution. The pre-Holocene section of the core represents terrestrial sedimentation in a fluviatile environment, contemporaneous of a low sea level and a di…
Comparing historic records of storm frequency and the North Atlantic Oscillation (NAO) chronology for the Azores region
The storminess of the Azores region was investigated using newspaper records from AD 1836 onwards. The information obtained was rank-ordered for intensity and the time series of storm frequency analysed for interannual- to century-scale variability. The documentary data set was validated by comparison with objective cyclones intensity for the period AD 1958—2000. Results indicate that four periods of contrasting storm frequency are present (AD 18…
La ocupación paleolítica del Alentejo meridional
El proyecto de prospección de la cuenca del río Sado (SRDS), llevado a cabo entre el 2004 y el 2008, se diseñó para suplir la carencia de información concerniente al conocimiento actual de la Prehistoria de Portugal. Aunque la cuenca del río Sado conforma casi un tercio de la superficie continental de Portugal, aún no había recibido la debida atención para el Paleolítico. Antes de este proyecto, prácticamente nada se conocía acerca de la Prehisto…
Modelação geológica do enchimento sedimentar Plisto-Holocénico da paleolaguna da Pederneira
A reconstrução paleoambiental das zonas húmidas litorais portuguesas constitui um elemento fundamental para o conhecimento da história evolutiva da zona costeira num passado geológico recente (Quaternário). Com a intenção de contribuir para o melhoramento do modelo de evolução da várzea da Nazaré (paleolaguna da Pederneira) durante o Plistocénico final e o Holocénico, procedeu-se à determinação da geometria e volumetria das unidades constituintes…
Onshore tsunami sediment transport mechanisms inferred from heavy mineral assemblages
The aim of this study is to discuss and to extend the characterization of (palaeo)tsunami deposits, and their source materials, based upon the detailed study of their heavy mineral assemblages. Results obtained from three distinct locations (Portugal, Scotland and Indonesia), different coastal contexts and chronologies (the tsunami events studied took place at 1500 cal. yr BP, AD 1755 and 2004) are summarized and discussed in order to contribute …
Single events and century-scale evolution of the northern margin of the Tagus River before the Boavista landfill
In this work we present preliminary results of the study of one sediment core (EDP1), collected near Cais do Sodré, Lisbon downtown, close to the present day Tagus riverfront. The results allowed differentiation of 4 major sediment units that present a signature of increasing anthropic influence over time. The lowermost unit (Unit 1) corresponds to a subtidal flat accreting in low energy and brackish conditions. This sedimentation pattern is inte…
Holocene sea level and climate interactions on wet dune slack evolution in SW Portugal
We examine the Holocene environmental changes in a wet dune slack of the Portuguese coast, Poço do Barbarroxa de Baixo. Lithology, organic matter, biological proxies and high-resolution chronology provide estimations of sediment accumulation rates and changes in environmental conditions in relation to sea-level change and climate variability during the Holocene. Results show that the wet dune slack was formed 7.5 cal. ka BP, contemporaneous with …
Núcleo De Estudos E Pesquisas Em Educação E Trabalho - Nepet (Unb)
Instituído no ano 2000, o NEPET teve por finalidade introduzir e desenvolver a temática sobre as relações entre a Educação e o Trabalho, no âmbito da Faculdade de Educação da Universidade de Brasília. Filia-se a uma perspectiva que enfatiza a dialética dessa relação e que parte do entendimento de que o trabalho é o ponto de partida para a compreensão dos processos educacionais
The role of climate, marine influence and sedimentation rates in late-Holocene estuarine evolution (SW Portugal)
Estuaries are sensitive to changes in global to regional sea level, to climate-driven variation in rainfall and to fluvial discharge. In this study, we use source and environmentally sensitive proxies together with radiocarbon dating to examine a 7-m-thick sedimentary record from the Sado estuary accumulated throughout the last 3.6 kyr. The lithofacies, geochemistry and diatom assemblages in the sediments accumulated between 3570 and 3240 cal. BP…
Landscape change and vegetation history in the city of Lisbon during Roman times and the Early Medieval Period
Pollen and NPP analysis performed on the sedimentary deposits accumulated in the inter-tidal banks of the Tagus Estuary allow for the reconstruction of vegetation history and landscape changes that occurred in Lisbon from the 1st to the 6th century cal AD. The high chronological resolution of this investigation makes it possible to identify changes in human activities that took place during the Roman period and reveals the extent of land use in t…
One step from the deep ocean
Evolução natural holocénica e perturbação antrópica na foz da Ribeira de Alcântara, Estuário do Tejo (Lisboa)
Este trabalho tem como objetivo caracterizar a evolução ambiental e morfológica da margem estuarina na foz da Ribeira de Alcântara (Estuário do Tejo, Lisboa) durante o Holocénico médio e recente, através do estudo sedimentológico de sedimentos recolhidos em Alcântara durante os trabalhos arqueológicos que decorreram na obra Lote 9 – Loteamento de Alcântara Poente. Foi possível identificar cinco unidades sedimentológicas com diferentes característ…
Geology (12 obras) · Geology and Paleoclimatology Research (7 obras) · Oceanography (7 obras) · Geography (6 obras) · Sediment (6 obras) · Geological and Geophysical Studies Worldwide (4 obras) · Holocene (4 obras) · Paleontology (4 obras) · Sedimentation (4 obras) · Structural basin (4 obras)