29 documents found, page 1 of 3
Revisiting the outwelling hypothesis: Modelling salt marsh detrital metal expor...
Duarte, Bernardo; Vaz, N.; Valentim, J.M.; Dias, J.M.; Silva, H.; Marques, J. C.; Sleimi, N.; Caçador, IsabelThe Tagus estuary is a mesotidal estuary located on the Western Portuguese coast, and is characterized by large areas of saltmarshes (17.24 km2) and tidal flats distributed along the margins. Halophyte vegetation in this system concentrates heavy metals during the growing season and subsequently releases these metals to the environment following senescence. Although there currently there are no metal discharges...
Sistema de informação para a gestão de emergências em Moçambique: Fatores críti...
Vaz, N.; Alturas, B.; Fernandes, A. L.A gestão de emergências (GE) depende fortemente da existência de um sistema de informação, suficientemente flexível e adequado às características das operações, e constitui, de acordo com a literatura, um dos maiores desafios na GE. O estudo apresenta os resultados da identificação dos Fatores Críticos de Sucesso (FCS) do Sistema de Informação de Gestão de Emergências (SIGE) em Moçambique. As cheias do ano de 2...
Modeling SST and chlorophyll patterns in a coupled estuary-coastal system of Po...
Vaz, N.; Mateus, M.; Plecha, S.; Sousa, M. C.; Leitão, P. C.; Neves, R.; Dias, J. M.This work studies the influence of the Tagus estuary, Portugal, on the near coastal systemusing amodel application to describe the main physical and biogeochemical processes in the Region of Freshwater Influence (ROFI). It was used as nested modeling approach, downscaling the solution for the general circulation from a larger domain model (the Portuguese coast), to the local Tagus estuary domain. The model is e...
Influence of the Minho River plume on the Rias Baixas (NW of the iberian penins...
Sousa, M. C.; Vaz, N.; Alvarez, I.; Gomez-Gesteira, M.; Dias, J. M.The buoyancy generated by the Minho estuarine plume can flood the Rias Baixas for long periods, reversing the normal salinity gradients. Thus, the main purpose of this work was to study the propagation of Minho estuarine plume to the Rias Baixas, establishing the wind and river discharge conditions in which this plume affects the circulation and hydrography features of these coastal systems as well as the plume...
Observation of a turbid plume using MODIS imagery: the case of Douro estuary (P...
Mendes, R.; Vaz, N.; Fernández-Nóvoa, D.; Da Silva, J. C. B.; DeCastro, M.; Gómez-Gesteira, M.; Dias, J. M.The Douro is one of the longest rivers in the Iberian Peninsula and represents the most important freshwater input into the Atlantic Ocean in the northwestern Portuguese coast. In order to fill the gaps on the comprehension of the spatial variability of the Douro estuarine plume, an innovative methodology was applied to observe and characterize this plume and its spatial and temporal variability. Using images o...
Assessment of chlorophyll variability along the northwestern coast of Iberian P...
Picado, A.; Alvarez, I.; Vaz, N.; Varela, R.; Gomez-Gesteira, M.; Dias, J. M.The northwestern coast of the Iberian Peninsula is characterized by a high primary production mainly supported by coastal upwelling, creating an extraordinary commercial interest for fisheries and aquaculture. Considering chlorophyll- a (Chl- a) as an indicator of primary production, its spatio-temporal variability was researched in this study in the surface water of this upwelling region from 1998 to 2007. Sat...
Modeling the Minho River plume intrusion into the Rias Baixas (NW Iberian Penin...
Sousa, M. C.; Vaz, N.; Alvarez, I.; Gomez-Gesteira, M.; Dias, J. M.The Minho River discharge is recognized as particularly important in driving the circulation and hydrography of Rias Baixas, which are highly productive fishery and aquaculture regions extremely sensitive to environmental characteristics. The intrusion of the Minho River plume inside these Rias can reverse the normal circulation pattern and affect the macronutrient concentrations, imposing a control on new prod...
Assessment of Wind Pattern Accuracy from the QuikSCAT Satellite and the WRF Mod...
Sousa, M. C.; Alvarez, I.; Vaz, N.; Gomez-Gesteira, M.; Dias, J. M.Surface wind along the Galician coast is a key factor allowing the analysis of important oceanographic features that are related to the great primary production in this area, as upwelling events. A comparative analysis between surface winds obtained from the Quick Scatterometer (QuikSCAT), the Weather Research and Forecasting (WRF) Model, and in situ observations from buoys along the Galician coast is carried o...
Tagus estuary and Ria de Aveiro salt marsh dynamics and the impact of sea level...
Valentim, J. M.; Vaz, N.; Silva, H.; Duarte, B.; Caçador, I.; Dias, J. M.Different characteristics of Spartina maritima found in two distinct salt marshes located in different estuaries were analysed through interpretation of their local hydrodynamic patterns, as well as the impact of sea level rise on physical processes and consequently on plant dynamics and salt marshes stability. These salt marshes are situated in two of the most important Portuguese coastal systems, Tagus estuar...
Salt Fluxes in a Complex River Mouth System of Portugal
Vaz, N.; Silva, J.; Dias, J. M.Measurements of velocity and salinity near the mouth and head of the Espinheiro channel (Ria de Aveiro lagoon, Portugal) are used to study the local variation of physical water properties and to assess the balance, under steady conditions, between the seaward salt transport induced by river discharge and the landward dispersion induced by various mixing mechanisms. This assessment is made using data sampled dur...