Ara es mostren els items 3-19 de 19

  • Bayesian trend analysis for daily rainfall series of Barcelona 

    Ortego Martínez, María Isabel; Gibergans Baguena, José; Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Llasat Botija, Maria Carmen (2010-07-15)
    Article
    Accés obert
    A Point-Over-Threshold approach using a reparameterization of the Generalized Pareto Distribution (GPD) has been used to assess changes in the daily rainfall Barcelona series (1854–2006). A Bayesian approach, considering ...
  • Checking model-data weather hazard occurrence fit in the context of climate change 

    Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2011)
    Text en actes de congrés
    Accés obert
    In climate change impact studies it is common to run a given response model (from ecosystem changes to wavestorm or landslide occurrence) nested into one of the available long-term Global or Regional Circulation Models ...
  • Classifying wave forecasts with model-based geostatistics and the Aitchison distribution 

    Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín; Gómez Aguar, Jesús Javier (2010)
    Text en actes de congrés
    Accés restringit per política de l'editorial
  • Climate change in a Point-Over-Threshold model: an example on ocean-wave-storm hazard in NE Spain 

    Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2010-09-27)
    Article
    Accés obert
    A reparametrization of the Generalized Pareto Distribution is here proposed. It is suitable to parsimoniously check trend assumptions within a Point-Over-Threshold model of hazardous events. This is based on considerations ...
  • Combining isotopic and compositional data: a discrimination of regions prone to nitrate pollution 

    Puig, Roger; Tolosana Delgado, Raimon; Otero, Neus; Folch Sancho, Albert (John Wiley & Sons, 2011)
    Capítol de llibre
    Accés restringit per política de l'editorial
  • Discrimination of TiO2 polymorphs in sedimentary and metamorphic rocks 

    Triebold, Silke; Luvizotto, George Luiz; Tolosana Delgado, Raimon; Zack, Thomas; von Eynatten, Hilmar (2010-07-13)
    Article
    Accés obert
    Investigation by Raman spectroscopy of samples from different geological settings shows that the occurrence of TiO2 polymorphs other than rutile can hardly be predicted, and furthermore, the occurrence of anatase is more ...
  • Geochemistry versus grain-size relations of sediments in the light of comminution, chemical alteration, and contrasting source rocks 

    von Eynatten, Hilmar; Tolosana Delgado, Raimon (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
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    Around 170 sediment samples from glacial and proximal glacio-fluvial deposits have been analysed for their geochemical composition. Samples derive from two strongly contrasting source areas (granitoids vs. amphibolite) and ...
  • Grain-size control on petrographic composition of sediments: compositional regression and rounded zeroes 

    Tolosana Delgado, Raimon; von Eynatten, Hilmar (2009-03-26)
    Article
    Accés obert
    It is well-known that sediment composition strongly depends on grain size. A number of studies have tried to quantify this relationship focusing on the sand fraction, but only very limited data exists covering wider grain ...
  • Guía para el análisis espacial de datos composicionales 

    Tolosana Delgado, Raimon (2011)
    Article
    Accés obert
    El tratamiento de bases de datos composicionales (proporciones, porcentajes, concentraciones, etc.) con dependencia espacial debe hacerse atendiendo a las características matemáticas de éstos: una composición válida debe ...
  • Jurassic granitoid magmatism in the Dinaride Neotethys: geochronological constraints from detrital minerals 

    Mikes, Tamás; Bäresel, Björn; Kronz, Andreas; Frei, Dirk; Dunkl, István; Tolosana Delgado, Raimon; von Eynatten, Hilmar (2009-12-01)
    Article
    Accés restringit per política de l'editorial
    Three independent single-grain geochronometers applied to detrital minerals from Central Dinaride sediments constrain the timing of felsic magmatism that associated the Jurassic evolution of the Neotethys. The Lower ...
  • Modelling barrier beaches under storms with XBEACH: The case of the Trabucador bar 

    García León, Manuel; Solé, J.M.; Gracia Garcia, Vicente; Alomar, Marta; Tolosana Delgado, Raimon; Fernández, J.; Pallarès López, Elena; Jiménez Quintana, José Antonio; Sánchez-Arcilla Conejo, Agustín (2011)
    Text en actes de congrés
    Accés obert
  • Pluviometric regionalization of Catalunya: a compositional data methodology 

    Gibergans Baguena, José; Ortego Martínez, María Isabel; Tolosana Delgado, Raimon (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
    Text en actes de congrés
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    The aim of this paper is to introduce a methodology for de¯ning groups from regionalized com- positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ...
  • The compositional meaning of a detection limit 

    van den Boogaart, Karl Gerard; Tolosana Delgado, Raimon; Bren, Matevz (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
    Text en actes de congrés
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    Conclusions The chemical interpretation of the detection limit and its stochastic model counterpart has thus different consequences for the statistical analysis than we would expect from the word by word interpretation of ...
  • Trend analysis for daily rainfall series of Barcelona 

    Ortego Martínez, María Isabel; Gibergans Baguena, José; Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Llasat Botija, Maria Carmen (2009-09-11)
    Text en actes de congrés
    Accés obert
    Frequency analysis of hydrological series is a key point to acquire an in-depth understanding of the behaviour of hydrologic events. The occurrence of extreme hydrologic events in an area may imply great social and ...
  • Unmixing compositional data with Bayesian techniques 

    Tolosana Delgado, Raimon (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
    Text en actes de congrés
    Accés obert
    A general problem in compositional data analysis is the unmixing of a composition into a series of pure endmembers. In its most complex version, one does neither know the composition of these endmembers, nor their relative ...
  • Uses and misuses of compositional data in sedimentology 

    Tolosana Delgado, Raimon (2012-12)
    Article
    Accés restringit per política de l'editorial
    This paper serves two goals. The first part shows how mass evolution processes of different nature become undistinguishable once we take a size-limited, noisy sample of its compositional fingerprint: processes of exponential ...
  • Wave height data assimilation using non-stationary kriging 

    Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín; Gómez Aguar, Jesús Javier (2011-03)
    Article
    Accés restringit per política de l'editorial
    Data assimilation into numerical models should be both computationally fast and physically meaningful, in order to be applicable in online environmental surveillance. We present a way to improve assimilation for computationally ...