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Registros recuperados: 7
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Contribution et Dépendance des flottilles de pêche aux espèces commerciales majeures du Golfe de Gascogne ArchiMer
Daures, Fabienne; Planchot, Marie; Demaneche, Sebastien; Van Isenghem, Sylvie; Berthou, Patrick; Leblond, Emilie; Jezequel, Michele.
In order to provide economic indicators for fisheries, analysis of contribution and economic dependencies of the Bay of Biscay fishing fleets to major commercial species catching in the ICES VIII area is conducted. 9 species are considered (regarding the importance of their landings in this area): Sole, Norway Lobster, Sea bass, Hake, Anglerfish, Anchovy, Sardine, Cuttlefish and Monkfish. The landings data are provided by the Harmonie database of the Fisheries Information System of Ifremer and the analysis per specie is done for the 2005 year on one side and over the period 2000-2005 on the other side. A stock slip is built for each species and presents : - Key figures on landings in the Bay of Biscay (total landings, average price, number of vessels...
Tipo: Text Palavras-chave: Bay of Biscay; Fleet; Economic dependence; DEM; Golfe de Gascogne; Flotte de pêche; Dépendance économique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/rapport-4697.pdf
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Digital soil mapping using multiple logistic regression on terrain parameters in southern Brazil Scientia Agricola
Giasson,Elvio; Clarke,Robin Thomas; Inda Junior,Alberto Vasconcellos; Merten,Gustavo Henrique; Tornquist,Carlos Gustavo.
Soil surveys are necessary sources of information for land use planning, but they are not always available. This study proposes the use of multiple logistic regressions on the prediction of occurrence of soil types based on reference areas. From a digitalized soil map and terrain parameters derived from the digital elevation model in ArcView environment, several sets of multiple logistic regressions were defined using statistical software Minitab, establishing relationship between explanatory terrain variables and soil types, using either the original legend or a simplified legend, and using or not stratification of the study area by drainage classes. Terrain parameters, such as elevation, distance to stream, flow accumulation, and topographic wetness...
Tipo: Info:eu-repo/semantics/article Palavras-chave: GIS; DEM; Soil survey; Terrain analysis.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300008
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Effects of Sand Addition and Bed Flushing on Gravel Bed Surface Microtopography and Roughness ArchiMer
Bertin, Stephane; Friedrich, Heide.
Gravel riverbeds naturally present a range of sediment size that can span several orders of magnitude. However, fine sediment (i.e., size <2 mm) additions affect sediment transport and are potentially harmful to the river ecology. Limited research has been done to understand the effects of sand addition on gravel bed topography. For this study, we conducted flume experiments testing the effectiveness of topography remote sensing to measure the response of a water-worked gravel bed to varying sand additions and bed flushing. Repeated measurements of the bed topography with through-water photogrammetry show that sand deposits primarily in low-lying areas of the bed, where it is sheltered. Observed changes in bed elevation standard deviation, skewness, and...
Tipo: Text Palavras-chave: Gravel bed; Sand addition; Bed flushing; DEM; Roughness; Photogrammetry.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00637/74905/75969.pdf
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Evaluating the quality of the Digital Elevation Models produced from ASTER stereoscopy for topographic mapping in the Brazilian Amazon Region Anais da ABC (AABC)
Oliveira,Cleber G. de; Paradella,Waldir R..
Brazilian Amazon is a vast territory rich in natural renewable and non-renewable resources. Due to the adverse environmental condition (rain, cloud, dense vegetation) and difficult access, topographic information is still poor, and when available needs to be up-dated or remapped. In this paper, the feasibility of using elevation generated from orbital ASTER- stereo-pairs images for topographic mapping was investigated for the mountainous relief in the Serra dos Carajás, Pará. The quality of information derived from these optical images was evaluated regarding field altimetric measurements. Precise topographic field information acquired from Global Positioning System (GPS) was used as Ground Control Points (GCPs) for the modeling of the stereoscopic Digital...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Topographic mapping; DEM; ASTER; Stereoscopy; Amazon Region.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200008
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Modelling air temperature for the state of São Paulo, Brazil Scientia Agricola
Rodríguez-Lado,Luis; Sparovek,Gerd; Vidal-Torrado,Pablo; Dourado-Neto,Durval; Macías-Vázquez,Felipe.
Spatial modelling of air temperature (maximum, mean and minimum) of the State of São Paulo (Brazil) was calculated by multiple regression analysis and ordinary kriging. Climatic data (mean values of five or more years) were obtained from 256 meteorological stations distributed uniformly over the State. The correlation between the climatic dependent variables, with latitude and altitude as independent variables was significant and could explain most of the spatial variability. The coefficients of determination (P < 0.05) varied in the range of 0.924 and 0.953, showing that multiple regression analysis is an accurate method for the modelling of air temperature for the State of São Paulo. Finally, these regression equations were used together with the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: DEM; GIS; Multiple regression analysis; Kriging; Climate modelling.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000500002
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Potential of Smartphone SfM Photogrammetry to Measure Coastal Morphodynamics ArchiMer
Jaud, Marion; Kervot, Matthieu; Delacourt, Christophe; Bertin, Stephane.
With recent advances in photogrammetric processing methods and sensor technologies, smartphones represent a new opportunity of mainstream, low-cost sensor, with a great potential for Structure-from-Motion (SfM) photogrammetry, and in particular for participatory science programs or citizen observatories. Keeping in mind the application in citizen observatories, three smartphone models (Galaxy S7 (R), Lumia 930 (R) and iPhone 8 (R)) and a bridge camera were compared (separately and in combination) for coastal applications: A coastal cliff and a sandy beach. Various acquisition protocols, at different distances from a cliff face and using "linear" or "fan-shaped" capture mode, were also assessed in their efficiency. A simultaneous Terrestrial Laser Scanner...
Tipo: Text Palavras-chave: Smartphone; SfM photogrammetry; Coastal monitoring; DEM; Citizen observatory.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00637/74907/76115.pdf
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Simulation of soil dynamic properties of a seed opener using the discrete element method (DEM) CIGR Journal
Chen, Ying; Gao, Qun; Zhou, Haibo; Sadek, Mohammad A..
Soil disturbance and draft force are important soil dynamic properties and performance indicators for a seed opener. In this study, a soil-opener model was developed to simulate soil dynamic properties of a hoe type seed opener using the discrete element method (DEM). To validate the model, a paired-row hoe opener was tested in a sandy loam soil at a working depth of 40 mm and a travel speed of 7 km/h. Soil disturbance characteristics (maximum soil surface roughness and soil cover depth) and draft force of the opener were measured. The model results agreed well with the test results, with relative errors under 10%. The validated model was used to compare the soil dynamic properties among a single-row opener, a side-band opener, and a paired-row opener. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural machinery Disturbance dynamics; Force; Hoe; Opener; DEM; PFC; Soil.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3227
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