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Hydroinformatic environment for coastal waters hydrodynamics and water quality modelling

Pinho, J. L. S.; Vieira, J. M. Pereira; Carmo, J. S. Antunes do
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Artigo de Revista Científica Formato: aplication/PDF
ENG
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66.59%
A hydroinformatic environment was created with the general objective of solving environmental problems in coastal waters. This environment consists of three components: a component for data organization and treatment; a component for modelling and simulating water quality and hydrodynamics; and a component for analysing, visualizing and editing the results. This paper describes the hydroinformatic components and the major developments introduced: different methodologies for analysing the performance of finite elements meshes, a conditioned mesh refinement procedure, a three-dimensional (3D) hydrodynamic model based on the Princeton Ocean Model with an alternative finite elements technique for the external mode computation, 2D and 3D water quality models for coastal waters and a methodology for GIS model results integration. The modular approach adopted in the development of this hydroinformatic environment appears to be a very suitable and versatile methodology for decision support systems to be applied in coastal zones environment management.; http://www.sciencedirect.com/science/article/B6V1P-4C4X0CT-1/1/0cce1a308cd80bbbd1f7f3e9356e3591

Eutrophication and macroalgal blooms in temperate and tropical coastal waters: nutrient enrichment experiments with Ulva spp.

TEICHBERG, Mirta; FOX, Sophia E.; OLSEN, Ylva S.; VALIELA, Ivan; MARTINETTO, Paulina; IRIBARNE, Oscar; MUTO, Elizabeti Yuriko; PETTI, Monica A. V.; CORBISIER, Thais N.; SOTO-JIMENEZ, Martin; PAEZ-OSUNA, Federico; CASTRO, Paula; FREITAS, Helena; ZITELLI, A
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.66%
Receiving coastal waters and estuaries are among the most nutrient-enriched environments on earth, and one of the symptoms of the resulting eutrophication is the proliferation of opportunistic, fast-growing marine seaweeds. Here, we used a widespread macroalga often involved in blooms, Ulva spp., to investigate how supply of nitrogen (N) and phosphorus (P), the two main potential growth-limiting nutrients, influence macroalgal growth in temperate and tropical coastal waters ranging from low- to high-nutrient supplies. We carried out N and P enrichment field experiments on Ulva spp. in seven coastal systems, with one of these systems represented by three different subestuaries, for a total of nine sites. We showed that rate of growth of Ulva spp. was directly correlated to annual dissolved inorganic nitrogen (DIN) concentrations, where growth increased with increasing DIN concentration. Internal N pools of macroalgal fronds were also linked to increased DIN supply, and algal growth rates were tightly coupled to these internal N pools. The increases in DIN appeared to be related to greater inputs of wastewater to these coastal waters as indicated by high delta 15N signatures of the algae as DIN increased. N and P enrichment experiments showed that rate of macroalgal growth was controlled by supply of DIN where ambient DIN concentrations were low...

Analysis of trace metals Cu2+, Pb2+ and Zn2+ in coastal marine water samples from Florianópolis, Santa Catarina State, Brazil

Mello,Lígia C.; Claudino,Alessandro; Rizzatti,Ivanise; Bortoluzzi,Rodolfo L.; Zanette,Dilson R.
Fonte: Sociedade Brasileira de Química Publicador: Sociedade Brasileira de Química
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2005 EN
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The determination of trace metal concentrations is an important indicator of toxicity toward species present in ocean environments. Stripping techniques are frequently used, due to their sensitivity and selectivity. In this investigation we were able to determine, efficiently, the concentration of lead(II), zinc(II) and copper(II), in coastal waters, using Differential Pulse Anodic Stripping Voltammetry (DPASV) and Differential Pulse Adsorptive Cathodic Stripping Voltammetry (DPACSV) techniques. For the determination of metal ion detection limits, synthetic samples were used, pH 2 for lead and zinc and pH 9 for copper. In order to check the accuracy of the procedure a certified coastal marine sample (CASS-4) was used and a concentration of 10.3 nmol L-1 for Cu(II) was obtained. The enrichment and recovery method was used for the metals analyzed, the following percent recoveries being obtained: 95±10 (Pb2+), 110±11 (Zn2+) and 95±8 (Cu2+). The total metal concentrations obtained were considered low, when compared with the indices established by CONAMA, particularly for lead and zinc. For the copper ion the higher concentration may be attributed to its use in the anti-fouling paint, and industrial processes.

Distribution of Vibrio alginolyticus-like species in Shenzhen coastal waters, China

Chen,Ming-Xia; Li,He-Yang; Li,Gang; Zheng,Tian-Ling
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2011 EN
Relevância na Pesquisa
66.59%
We investigated the distribution of vibrios in Shenzhen coastal waters in order to obtain valuable information for the aquaculture industry and a health warning system. Quantities of vibrios from surface waters ranged from 0 to 4.40×10(4) CFUs mL-1 in April (spring), while from 0 to 2.57×10³ CFUs mL-1 in September (autumn); the abundance of V. alginolyticus-like species from surface water ranged from 0 to 6.72×10³ CFUs mL-1 in April (spring) and from 0 to 1.28×10³ CFUs mL-1 in September (autumn); higher counts were observed in spring. The V. alginolyticus-like species was dominant in Shenzhen coastal waters, with the highest abundance in the clean region (stations YMK001 and GDN064) in April, suggesting that Vibrio spp. were naturally occurring bacteria in marine environments. The correlation between the abundance of vibrios (including V. alginolyticus-like species) and environmental factors varied in different regions and different seasons. There were no vibrios detected when the salinity was less than 11.15‰ in the Zhujiang River estuary, which indicated that salinity played a key role in the distribution of vibrios and V. alginolyticus-like species.

Environmental Influences on Vibrio Populations in Northern Temperate and Boreal Coastal Waters (Baltic and Skagerrak Seas)†

Eiler, Alexander; Johansson, Mona; Bertilsson, Stefan
Fonte: American Society for Microbiology Publicador: American Society for Microbiology
Tipo: Artigo de Revista Científica
Publicado em /09/2006 EN
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46.6%
Even if many Vibrio spp. are endemic to coastal waters, their distribution in northern temperate and boreal waters is poorly studied. To identify environmental factors regulating Vibrio populations in a salinity gradient along the Swedish coastline, we combined Vibrio-specific quantitative competitive PCR with denaturant gradient gel electrophoresis-based genotyping. The total Vibrio abundance ranged from 4 × 103 to 9.6 × 104 cells liter−1, with the highest abundances in the more saline waters of the Skagerrak Sea. Several Vibrio populations were present throughout the salinity gradient, with abundances of single populations ranging from 5 × 102 to 7 × 104 cells liter−1. Clear differences were observed along the salinity gradient, where three populations dominated the more saline waters of the Skagerrak Sea and two populations containing mainly representatives of V. anguillarum and V. aestuarianus genotypes were abundant in the brackish waters of the Baltic Sea. Our results suggest that this apparent niche separation within the genus Vibrio may also be influenced by alternate factors such as nutrient levels and high abundances of dinoflagellates. A V. cholerae/V. mimicus population was detected in more than 50% of the samples...

Eutrophication and macroalgal blooms in temperate and tropical coastal waters: nutrient enrichment experiments with Ulva spp.

Teichberg, Mirta; Fox, Sophia E; Olsen, Ylva S; Valiela, Ivan; Martinetto, Paulina; Iribarne, Oscar; Muto, Elizabeti Yuriko; Petti, Monica A V; Corbisier, Thaïs N; Soto-Jiménez, Martín; Páez-Osuna, Federico; Castro, Paula; Freitas, Helena; Zitelli, An
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Publicado em /09/2010 EN
Relevância na Pesquisa
46.66%
Receiving coastal waters and estuaries are among the most nutrient-enriched environments on earth, and one of the symptoms of the resulting eutrophication is the proliferation of opportunistic, fast-growing marine seaweeds. Here, we used a widespread macroalga often involved in blooms, Ulva spp., to investigate how supply of nitrogen (N) and phosphorus (P), the two main potential growth-limiting nutrients, influence macroalgal growth in temperate and tropical coastal waters ranging from low- to high-nutrient supplies. We carried out N and P enrichment field experiments on Ulva spp. in seven coastal systems, with one of these systems represented by three different subestuaries, for a total of nine sites. We showed that rate of growth of Ulva spp. was directly correlated to annual dissolved inorganic nitrogen (DIN) concentrations, where growth increased with increasing DIN concentration. Internal N pools of macroalgal fronds were also linked to increased DIN supply, and algal growth rates were tightly coupled to these internal N pools. The increases in DIN appeared to be related to greater inputs of wastewater to these coastal waters as indicated by high δ15N signatures of the algae as DIN increased. N and P enrichment experiments showed that rate of macroalgal growth was controlled by supply of DIN where ambient DIN concentrations were low...

Can Humic Water Discharge Counteract Eutrophication in Coastal Waters?

Andersson, Agneta; Jurgensone, Iveta; Rowe, Owen F.; Simonelli, Paolo; Bignert, Anders; Lundberg, Erik; Karlsson, Jan
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 18/04/2013 EN
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46.59%
A common and established view is that increased inputs of nutrients to the sea, for example via river flooding, will cause eutrophication and phytoplankton blooms in coastal areas. We here show that this concept may be questioned in certain scenarios. Climate change has been predicted to cause increased inflow of freshwater to coastal areas in northern Europe. River waters in these areas are often brown from the presence of high concentrations of allochthonous dissolved organic carbon (humic carbon), in addition to nitrogen and phosphorus. In this study we investigated whether increased inputs of humic carbon can change the structure and production of the pelagic food web in the recipient seawater. In a mesocosm experiment unfiltered seawater from the northern Baltic Sea was fertilized with inorganic nutrients and humic carbon (CNP), and only with inorganic nutrients (NP). The system responded differently to the humic carbon addition. In NP treatments bacterial, phytoplankton and zooplankton production increased and the systems turned net autotrophic, whereas the CNP-treatment only bacterial and zooplankton production increased driving the system to net heterotrophy. The size-structure of the food web showed large variations in the different treatments. In the enriched NP treatments the phytoplankton community was dominated by filamentous >20 µm algae...

Temporal and Spatial Diversity of Bacterial Communities in Coastal Waters of the South China Sea

Du, Jikun; Xiao, Kai; Li, Li; Ding, Xian; Liu, Helu; Lu, Yongjun; Zhou, Shining
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 13/06/2013 EN
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46.62%
Bacteria are recognized as important drivers of biogeochemical processes in all aquatic ecosystems. Temporal and geographical patterns in ocean bacterial communities have been observed in many studies, but the temporal and spatial patterns in the bacterial communities from the South China Sea remained unexplored. To determine the spatiotemporal patterns, we generated 16S rRNA datasets for 15 samples collected from the five regularly distributed sites of the South China Sea in three seasons (spring, summer, winter). A total of 491 representative sequences were analyzed by MOTHUR, yielding 282 operational taxonomic units (OTUs) grouped at 97% stringency. Significant temporal variations of bacterial diversity were observed. Richness and diversity indices indicated that summer samples were the most diverse. The main bacterial group in spring and summer samples was Alphaproteobacteria, followed by Cyanobacteria and Gammaproteobacteria, whereas Cyanobacteria dominated the winter samples. Spatial patterns in the samples were observed that samples collected from the coastal (D151, D221) waters and offshore (D157, D1512, D224) waters clustered separately, the coastal samples harbored more diverse bacterial communities. However, the temporal pattern of the coastal site D151 was contrary to that of the coastal site D221. The LIBSHUFF statistics revealed noticeable differences among the spring...

Optical Algorithms at Satellite Wavelengths for Total Suspended Matter in Tropical Coastal Waters

Ouillon, Sylvain; Douillet, Pascal; Petrenko, Anne; Neveux, Jacques; Dupouy, Cécile; Froidefond, Jean-Marie; Andréfouët, Serge; Muñoz-Caravaca, Alain
Fonte: Molecular Diversity Preservation International (MDPI) Publicador: Molecular Diversity Preservation International (MDPI)
Tipo: Artigo de Revista Científica
Publicado em 10/07/2008 EN
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46.62%
Is it possible to derive accurately Total Suspended Matter concentration or its proxy, turbidity, from remote sensing data in tropical coastal lagoon waters? To investigate this question, hyperspectral remote sensing reflectance, turbidity and chlorophyll pigment concentration were measured in three coral reef lagoons. The three sites enabled us to get data over very diverse environments: oligotrophic and sediment-poor waters in the southwest lagoon of New Caledonia, eutrophic waters in the Cienfuegos Bay (Cuba), and sediment-rich waters in the Laucala Bay (Fiji). In this paper, optical algorithms for turbidity are presented per site based on 113 stations in New Caledonia, 24 stations in Cuba and 56 stations in Fiji. Empirical algorithms are tested at satellite wavebands useful to coastal applications. Global algorithms are also derived for the merged data set (193 stations). The performances of global and local regression algorithms are compared. The best one-band algorithms on all the measurements are obtained at 681 nm using either a polynomial or a power model. The best two-band algorithms are obtained with R412/R620, R443/R670 and R510/R681. Two three-band algorithms based on Rrs620.Rrs681/Rrs412 and Rrs620.Rrs681/Rrs510 also give fair regression statistics. Finally...

Identification and Antimicrobial Resistance of Enterococcus Spp. Isolated from the River and Coastal Waters in Northern Iran

Alipour, Majid; Hajiesmaili, Reza; Talebjannat, Maryam; Yahyapour, Yousef
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
EN
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46.66%
As fecal streptococci commonly inhabit the intestinal tract of humans and warm blooded animals, and daily detection of all pathogenic bacteria in coastal water is not practical, thus these bacteria are used to detect the fecal contamination of water. The present study examined the presence and the antibiotic resistance patterns of Enterococcus spp. isolated from the Babolrud River in Babol and coastal waters in Babolsar. Seventy samples of water were collected in various regions of the Babolrud and coastal waters. Isolated bacteria were identified to the species level using standard biochemical tests and PCR technique. In total, 70 Enterococcus spp. were isolated from the Babolrud River and coastal waters of Babolsar. Enterococcus faecalis (68.6%) and Enterococcus faecium (20%) were the most prevalent species. Resistance to chloramphenicol, ciprofloxacin, and tetracyclin was prevalent. The presence of resistant Enterococcus spp. in coastal waters may transmit resistant genes to other bacteria; therefore, swimming in such environments is not suitable.

Developing Reference Conditions for Phytoplankton in the Baltic Coastal Waters Part II: Examples of Reference Conditions Developed for the Baltic Sea

CARSTENSEN J.; HEISKANEN ANNA-STIINA; KAUPPILA P.; NEUMANN T.; SCHERNEWSKI G.; GROMISZ S.
Fonte: Centro Comum de Pesquisa da Comissão Européia Publicador: Centro Comum de Pesquisa da Comissão Européia
Tipo: EUR - Scientific and Technical Research Reports Formato: Printed
ENG
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46.62%
For the implementation of the Water Framework Directive reference conditions have to be established for the various quality element. In this report we outline a number of approaches that can be pursued for establishing reference conditions for hytoplankton at a regional level and discuss the problems associated with their application. This report does not exhaust the topic of establishing reference conditions in the different coastal types of the Baltic Sea, while it should be digested as a source for inspiration when analyses are carried out at a regional level. Phytoplankton has been quantitatively analysed in the Baltic Sea since the 1970s with increasing frequency of sampling over the last decade. Prior to this only few qualitative studies have been carried out, providing insufficient material to estimate conditions from before the intensification of eutrophication in the Baltic Sea to be considered as reference conditions. In the Gulf of Bothnia, the outer coastal areas have not been substantially impacted by anthropogenic nutrients inputs. Thus the distribution of phytoplankton data from these sites may therefore represent reference conditions. However, adopting this approach for all Finnish coastal waters, summer chlorophyll a reference conditions vary between 1.2 to 3.4 μg l-1. Paleoecological studies from the Laajalahti bay (which is a shallow bay in the south coast of Finland) suggest a reference value for annual summer chlorophyll a of 10 μg l-1. However...

A Pan-European Delimitation of Coastal Waters: Compliance with EU Environmental Legislation

LIQUETE GARCIA MARIA DEL CAMINO; SOMMA Francesca; MAES JOACHIM
Fonte: Publications Office of the European Union Publicador: Publications Office of the European Union
Tipo: EUR - Scientific and Technical Research Reports Formato: Online
ENG
Relevância na Pesquisa
46.82%
The definition of coastal waters in relation to EU environmental legislation was clearly stated in the Water Framework Directive. In compliance with this Directive, most of the EU Member States delineated their coastal waters¿ boundaries. However, these delineations are not as complete and homogeneous as could be expected. A clear identification of European coastal waters boundaries is crucial for the implementation of the Water Framework Directive and the Marine Strategy Framework Directive, which depend on an accurate ecological/environmental assessment of those waters. Hence, there is a need for a comprehensive and unambiguous delimitation of European coastal waters. This report aims at bridging this gap providing a pan-European mapping of coastal waters, which cover 553,817 km2 in 30 seaside countries, 340,524 km2 of which pertain to the 22 EU Member States connected to the sea. For this purpose, a comprehensive geographical analysis of the national baselines and transitional waters distribution was performed. A pan-European baseline of 63,340 km was delineated as a basis for the European coastal waters delimitation. The European coastal waters identified in this work show significant differences with the available national declarations (almost 12% of the compared area)...

A clear delimitation of coastal waters facing the EU environmental legislation: from the Water Framework Directive to the Marine Strategy Framework Directive

LIQUETE GARCIA MARIA DEL CAMINO; SOMMA Francesca; MAES JOACHIM
Fonte: ELSEVIER SCI LTD Publicador: ELSEVIER SCI LTD
Tipo: Articles in Journals Formato: Online
ENG
Relevância na Pesquisa
46.82%
The definition of coastal waters in relation to EU environmental legislation was clearly stated in the Water Framework Directive. In compliance with this Directive, most of the EU Member States have delineated their coastal waters¿ boundaries. However, these delineations are not as complete and homogeneous as could be expected. Hence, there is a need for a comprehensive and unambiguous delimitation of European coastal waters. This paper aims at bridging this gap, providing a pan-European mapping of coastal waters, covering 553,817 km2 in 30 seaside countries, 340,524 km2 of which pertain to the 22 EU Member States connected to the sea. For this purpose, a comprehensive geographical analysis of the national baselines and transitional waters distribution was performed. A pan-European baseline of 63,340 km was delineated, together with the coastal waters delimitation. The results show significant differences between the available national declarations of coastal waters and the areas identified in this work (almost 12% of the compared area), the former defining an additional 29,337 km2 of coastal waters with respect to the latter. The largest deviations seem to be due either to misinterpretations of the definition of coastal waters, or to one-sided national modifications. A clear identification of European coastal waters boundaries is crucial for the Water Framework Directive and the Marine Strategy Framework Directive implementations...

Remote Sensing of Coastal Waters

HOEPFFNER NICOLAS; ZIBORDI GIUSEPPE
Fonte: Elsevier Ltd Publicador: Elsevier Ltd
Tipo: Articles in books Formato: Printed
ENG
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46.64%
Satellite remote sensing and its application to coastal waters are briefly documented, giving emphasis to the retrieval of ocean colour products. The document addresses the complexity of coastal water optics, imposed by unrelated multiple compounds in the water column, affecting the light field through their own absorption and scattering properties. Other difficulties to take into consideration when analyzing satellite data in coastal waters include bottom reflectance and transpectral processes such as fluorescence due to high concentration of phytoplankton pigments. The atmospheric correction of coastal data is challenged by the presence of continental aerosols, bottom albedo, and, adjacency of land and marine regions. Blue to green band ratio algorithms commonly developed for open ocean are not suitable for highly dynamic coastal water. Some improvements may be gained with multi- and hyper-spectral sensors using bands better representing the water optical conditions. More sophisticated statistical and mathematical approaches to account for multivariate, non-linear systems are still under research development. The applications of satellite remote sensing in coastal waters are becoming more and more numerous in support to different sectors and community interests. The accuracy of the products may be...

Simultaneous extraction and fate of linear alkylbenzene sulfonates, coconut diethanol amides, nonylphenol ethoxylates and their degradation products in wastewater treatment plants, receiving coastal waters and sediments in the Catalonian area (NE Spain)

González Blanco, Susana; Petrovic, Mira; Barceló, Damià
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 22195 bytes; application/pdf
ENG
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56.41%
10 pages, 4 figures, 5 tables.-- PMID: 15527127 [PubMed].-- Printed version published Oct 15, 2004.-- Presented at the 3rd Meeting of the Spanish Association of Chromatography and Related Techniques and the European Workshop: 3rd Waste Water Cluster, Aguadulce (Almeria), Spain, Nov 19–21, 2003.; The efficiency of six wastewater treatment plants (WWTPs) in the Catalonian region to remove several classes of ionic and non-ionic surfactants was investigated, using solid-phase extraction (SPE) followed by liquid chromatography–mass spectrometry (LC–MS). Occurrence and distribution of linear alkylbenzene sulfonates (LASs), coconut diethanol amides (CDEAs), nonylphenol ethoxylates (NPEOs) and their degradation products were studied in coastal areas receiving WWTP effluents. For the analysis of sediment samples pressurized liquid extraction (PLE) followed by SPE extract clean-up and LC–MS detection was used for simultaneous extraction of all target compounds. Concentrations of parent long ethoxy chain NPEOs in raw water entering WWTPs ranged from 60 to 190 μg/L. In effluents concentrations ranged from 2.8 to 6.6 μg/L, which corresponded to an average primary elimination of 93–96%. Nonylphenol (NP) was found in concentrations from 0.2 to 18 μg/L in WWTP influents and up to 5 μg/L in the treated water...

Application of chemometric methods to the investigation of main microcontaminant sources of endocrine disruptors in coastal and harbour waters and sediments

Peré-Trepat, Emma; Petrovic, Mira; Barceló, Damià; Tauler Ferré, Romà
Fonte: Springer Publicador: Springer
Tipo: Artículo Formato: 22195 bytes; application/pdf
ENG
Relevância na Pesquisa
56.44%
13 pages, 10 figures, 1 table.-- PMID: 14663546 [PubMed].-- Available online Dec 9, 2003.; Identification, resolution and distribution of main microcontaminant sources of endocrine disruptors in Spanish harbours, coastal waters and sediments are investigated using chemometric methods. We investigated eighteen different endocrine disruptor chemical compounds, including non-ionic surfactants, their degradation products and linear alkylbenzene sulfonates, found in a total number of 74 samples (35 water samples and 39 sediment samples) over a period of 16 months from March 1999 to July 2000, and in 32 different geographical sites along the Spanish Mediterranean Coast (e.g. Barcelona, Tarragona, Almeria Harbour, Malaga and the Bay of Cadiz). Main environmental contamination sources of these endocrine disruptor compounds were investigated and interpreted according to their chemical composition and according to their resolved geographical distribution profiles.; This research was funded by the CICYT AMB98–0913-C03–01 and PPQ 2001–1805-C03 MCYT Projects.; Peer reviewed

Long Waves in Ocean and Coastal Waters

Wu, Theodore Y.
Fonte: American Society of Civil Engineers Publicador: American Society of Civil Engineers
Tipo: Article; PeerReviewed Formato: application/pdf
Publicado em /06/1981
Relevância na Pesquisa
46.64%
Water waves occurring in the ocean have a wide spectrum of wavelength and period, ranging from capillary waves of 1 cm or shorter wavelength to long waves with wavelength being large compared to ocean depth, anywhere from tens to thousands of kilometers. Of the various long-wavegenic sources, distant body forces can act as the continuous ponderomotive force for the tides. Hurricanes and storms in the sea can develop a sea state, with the waves being worked on by winds and eventually cascading down to swells after a long distance of travel away from their birthplace. Large tsunamis can be ascribed to a rapidly occurring tectonic displacement of the ocean floor (usually near the coast of the Pacific Ocean) over a large horizontal dimension (of hundreds to over a thousand square kilometers) during strong earthquakes, causing vertical displacements to ocean floor of tens of meters. Other generation mechanisms include underwater subsidence or land avalanche in the ocean and submarine volcanic eruption. Gigantic rockfalls and long-period seismic waves can also produce gravity waves in lakes, reservoirs, and rivers. Generation, propagation, and evolution of such long waves in the ocean and their effects in coastal waters and harbors is a subject of increasing importance in civil...

O microfitoplâncton das águas costeiras do litoral Fluminense (estado do Rio de Janeiro): lista de especies e aspectos ecológicos; Microphytoplankton from coastal waters of Rio de Janeiro: species composition and ecological aspects

Silva, Nadja M. Lins da; Valentin, Jean L; Bastos, Christina T. B
Fonte: Universidade de São Paulo. Instituto Oceanográfico Publicador: Universidade de São Paulo. Instituto Oceanográfico
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 01/01/1988 POR
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56.41%
Phytoplankton of the coastal water between Cabo Frio and Rio de Janeiro were studied at the upwelling season (October, January and Maroh). Qualitative and quantitative variations are analized in function of the hydrological conditions by means of a multivariate statistical treatment of data. Cabo Frio upwelling is responsible for occurrence of a thermocline in the euphotic layer which induces phytoplankton growth, beginning by small-sized species (Nitzschia spp, Skeletonema costatum) and evoluting to highest diversity and quantity of different microphytoplanktonic forms (Guinardia, Rhizosolenia, Chaetoceros, Thalassiothrix). When water column is sharply stratified, we observe Guanabara Bay influence, with high growth of Skeletonema costatum and high quantity of detritus together with blue-green algae and nanoplanktonic forms.; O microfitoplâncton das águas costeiras entre Cabo Frio e Rio de Janeiro foi coletado durante as operações PLATAFORMA IV, V e VI do AvPqOc SO OLIVEIRA (DGN) nos meses de outubro de 1984 e janeiro e março de 1985, As variações qualitativas e quantitativas foram analisadas em função das condições hidrológicas por meio de um tratamento estatístico multivariado dos dados. O fenômeno de ressurgência...

An Integrated physics-based approach to demonstrate the potential of the Landsat Data Continuity Mission (LDCM) for monitoring coastal/inland waters

Pahlevan, Nima
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Dissertação
EN_US
Relevância na Pesquisa
56.66%
Monitoring coastal or inland waters, recognized as case II waters, using the existing Landsat technology is somewhat restricted because of its low Signal-to-Noise ratio (SNR) as well as its relatively poor radiometric resolution. As a primary task, we introduce a novel technique, which integrates the Landsat-7 data as a surrogate for LDCM with a 3D hydrodynamic model to monitor the dynamics of coastal waters near river discharges as well as in a small lake environment. The proposed approach leverages both the thermal and the reflective Landsat-7 imagery to calibrate the model and to retrieve the concentrations of optically active components of the water. To do so, the model is first calibrated by optimizing its thermal outputs with the surface temperature maps derived from the Landsat-7 data. The constituent retrieval is conducted in the second phase where multiple simulated concentration maps are provided to an in-water radiative transfer code (Hydrolight) to generate modeled surface reflectance maps. Prior to any remote sensing task, one has to ensure that a dataset comes from a well-calibrated imaging system. Although the calibration status of Landsat-7 has been regularly monitored over multiple desert sites, it was desired to evaluate its performance over dark waters relative to a well-calibrated instrument designed specifically for water studies. In the light of this...

INCIDENCE OF Vibrio parahaemolyticus IN MARINE COASTAL WATERS IN THE CITY OF JOÃO PESSOA PR (BRAZIL); INCIDÊNCIA DE Vibrio parahaemolyticus EM ÁGUAS MARINHAS COSTEIRAS NA CIDADE DE JOÃO PESSOA PR*

SOUSA, CRISTINA PAIVA DE; Universidade Federal da Paraíba; LIMA, ANTONIO LIMA C.; Universidade Federal da Paraíba; CARBAJAL, FREDDY R.
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Formato: application/pdf
Publicado em 02/06/2009 POR
Relevância na Pesquisa
66.44%
It is related in this paper, tl1e incidence of Vibrio parahaemolyticus in 21 samples of marine coastal waters collected in various places of João Pessoa -PB-Brazil. It was detected. parahaeunlyticusin 42,9% of tl1e samples. In 127 isolated colonies, 35,4 were typical and 44,4% of these, were positive for the microrganismo The average contamination (NMP/ml) was 8,6 x 10, excluded the minor results 3,0 x 10, and 14,5% were contaminated with a number superior to 102 organism/ml, representing public health hazard. It was observed some influence in the nwnber of V. parahaemolyticus by the sampling local and period of collection.; Relata-se no presente trabalho a incidência de Vibrio parahaemolyticusa partir de 21 amostras de águas marinhas costeiras obtidas em diferentes praias do litoral de João Pessoa - PB. Detectou-se a presença de y. parahaemolyticus em 42,9% das amostras. Das 127 colônias isoladas, 35,4% eram típicas e 44,4% destas, positivas para o organismo. A contaminação média (NMP/ml) das amostras foi de 8,6 x 10, excluindo-se os valores menores que 3,0 x 10, sendo que 14,5% apresentaram-se contaminadas com número superior a 102organisnos/ml, representando risco potencial à saúde pública. Há...