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| Registros recuperados: 10 | |
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| Rawat, Arshad. |
| Wind-generated surface gravity waves are ubiquitous at the ocean surface. Their period varies between 2 and 25 seconds, with wavelength varying between a few meters to several hundreds of meters. Longer and, lower frequency surface gravity waves, called infragravity (IG) waves, are associated to these short, high frequency wind-generated waves. These infragravity waves have dominant periods comprised between 30 seconds and 10 minutes, and, when they propagate freely, with horizontal wavelengths of up to tens of kilometres, as given by the linear surface gravity wave dispersion relation. Outside of surf zones, the vertical amplitude of these infragravity waves is of the order of 1-10 cm, while the amplitude of wind-generated waves is of the order of 1-10... |
| Tipo: Text |
Palavras-chave: Ondes infragravitaires; Modélisation à l'échelle globale; Infragravity waves; SWOT; Global wave model. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00498/60937/64330.pdf |
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| Ardhuin, Fabrice; Rawat, Arshad; Aucan, Jerome. |
| The spectral wave model WAVEWATCH III is extended from the windsea and swell band to lower frequencies, in order to represent free waves in the infragravity (IG) wave band. This extension is based on an empirical source of IG energy, which is defined along shorelines from the significant wave height and a mean period. The empirical proportionality factor is found to reproduce accurately the variations of free IG wave energy in coastal areas, where it was calibrated, and also has a good skill at global scales. In the open ocean, the model is particularly verified for frequencies in the range 5 to 14 mHz for which ocean bottom records are sensitive to the IG signal. The model captures between 30% and 80% of the variance in IG wave heights, depending on... |
| Tipo: Text |
Palavras-chave: Infragravity waves; SWOT; Spectral model. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00181/29272/28639.pdf |
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| Yu, Xiaolong; Ponte, Aurelien; Elipot, Shane; Menemenlis, Dimitris; Zaron, Edward D.; Abernathey, Ryan. |
| The surface kinetic energy of a 1/48° global ocean simulation and its distribution as a function of frequency and location are compared with the one estimated from 15,329 globally distributed surface drifter observations at hourly resolution. These distributions follow similar patterns with a dominant low‐frequency component and well‐defined tidal and near‐inertial peaks globally. Quantitative differences are identified with deficits of low‐frequency energy near the equator (factor 2) and at near‐inertial frequencies (factor 3) and an excess of energy at semidiurnal frequencies (factor 4) for the model. Owing to its hourly resolution and its near‐global spatial coverage, the array of surface drifters is an invaluable tool to evaluate the realism of... |
| Tipo: Text |
Palavras-chave: LLC4320; Surface drifter; Rotary spectrum; SWOT. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00514/62517/66817.pdf |
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| Muelbert, Jose H.; Nidzieko, Nicholas J.; Acosta, Alicia T. R.; Beaulieu, Stace E.; Bernardino, Angelo F.; Boikova, Elmira; Bornman, Thomas G.; Cataletto, Bruno; Deneudt, Klaas; Eliason, Erika; Kraberg, Alexandra; Nakaoka, Masahiro; Pugnetti, Alessandra; Ragueneau, Olivier; Scharfe, Mirco; Soltwedel, Thomas; Sosik, Heidi M.; Stanisci, Angela; Stefanova, Kremena; Stephan, Pierre; Stier, Adrian; Wikner, Johan; Zingone, Adriana. |
| Understanding the threats to global biodiversity and ecosystem services posed by human impacts on coastal and marine environments requires the establishment and maintenance of ecological observatories that integrate the biological, physical, geological, and biogeochemical aspects of ecosystems. This is crucial to provide scientists and stakeholders with the support and knowledge necessary to quantify environmental change and its impact on the sustainable use of the seas and coasts. In this paper, we explore the potential for the coastal and marine components of the International Long-Term Ecological Research Network (ILTER) to fill this need for integrated global observation, and highlight how ecological observations are necessary to address the challenges... |
| Tipo: Text |
Palavras-chave: Climate change; Marine ecosystems; Ecology; EOVs; SWOT; DEIMS. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00615/72756/72025.pdf |
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| Lorance, Pascal; Agnarsson, Sveinn; Damalas, Dimitrios; Des Clers, Sophie; Figueiredo, Ivone; Gil, Juan; Trenkel, Verena. |
| Stakeholder knowledge was collected through questionnaires and cognitive maps and used to summarize biological, environmental, technical, management, and socio-economic factors for several deep-water fisheries, identifying regional management issues and solutions. The questionnaires and cognitive maps revealed different technical, environmental, and management concerns in these fisheries. Dissatisfaction with management was more at an implementation than a conceptual level, because the existing management measures were mostly considered fit for purpose. Further, catch-and-effort data provided by the fishing industry were used to calculate standardized landings per unit effort. The results suggested different trends over time for three deep-water stocks... |
| Tipo: Text |
Palavras-chave: Closure; Control; Cpue; Regulation; SWOT; TAC; Technical measures. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15420/13376.pdf |
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| Calus, Mieke; Lauwers, Ludwig H.. |
| Traditionally, the family farm has always been seen as a cornerstone of the agricultural production system. Given social, economic and political evidence (Calus, 2009), this organisational form might still continue to shape agricultural development. However, important changes in social and economic environment (e.g. industrialisation of agriculture, increased risk level and public vision on agriculture) become threats to the traditional model. A SWOT analysis of the family farms indicates the various intrinsic characteristics that make family farms resilient to changing conditions. Even in a changing economic and social landscape these aspects provide them with building blocks for creating new organisational forms or institutional arrangements. This paper... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Family farm; Corporate farm; Peasant; SWOT; Consumer/Household Economics. |
| Ano: 2009 |
URL: http://purl.umn.edu/52857 |
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| Mei, Yan; Xiao, Xiao. |
| Land reform development in China has experienced three great reforms, and new policy of rural land circulation in new period was an inevitable trend of rural economic development. SWOT analytical method was adopted to study the influences of the new policy on rural tourism development, which led to new opportunities, including developing rural tourism in scale and realizing capitalization of the resources. However, there were many problems and challenges, which were showed in neglecting the guarantee of farmers’ interests and lacking the protection of rural landscape. Hence, the measures for rural tourism development under new situations should be taken as follows. To begin with, it should give full play to government function; secondly, it must strengthen... |
| Tipo: Thesis or Dissertation |
Palavras-chave: Land circulation; SWOT; Development strategy; China; Rural tourism; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/53603 |
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| Registros recuperados: 10 | |
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