A Caro

Ciemat-Centro Investigaciones Energéticas, Medioambientales Y Tecnológicas, Madrid, Madrid, Spain

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Publications (2)2.94 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: The knowledge of the distribution of (137)Cs deposition over Spanish mainland soils along with the geographical, physical and morphological terrain information enable us to know the (137)Cs background content in soil. This could be useful as a tool in a hypothetical situation of an accident involving a radioactive discharge or in soil erosion studies. A Geographic Information System (GIS) would allow the gathering of all the mentioned information. In this work, gamma measurements of (137)Cs on 34 Spanish mainland soils, rainfall data taken from 778 weather stations, soil types and geographical and physical terrain information were input into a GIS. Geostatistical techniques were applied to interpolate values of (137)Cs activity at unsampled places, obtaining prediction maps of (137)Cs deposition. Up to now, geostatistical methods have been used to model spatial continuity of data. Through semivariance and cross-covariance functions the spatial correlation of such data can be studied and described. Ordinary and simple kriging techniques were carried out to map spatial patterns of (137)Cs deposition, and ordinary and simple co-kriging were used to improve the prediction map obtained through a second related variable: namely the rainfall. To choose the best prediction map of (137)Cs deposition, the spatial dependence of the variable, the correlation coefficient and the prediction errors were evaluated using the different models previously mentioned. The best result for (137)Cs deposition map was obtained when applying the co-kriging techniques.
    Journal of environmental radioactivity 08/2012; 115C:53-59. · 1.47 Impact Factor
  • [show abstract] [hide abstract]
    ABSTRACT: In this study the total activity of (137)Cs deposited per unit area over the Spanish peninsular territory was analysed using a 150 × 150 km(2) mesh grid, with samples taken from 29 points. The deposited activities ranged between 251 and 6074 Bq/m(2). A linear relationship was obtained between these values and the mean annual rainfall at each sampling point which allowed a map to be drawn, using GIS software, which shows the distribution of total deposited (137)Cs activity across the Spanish mainland. At twelve of these sampling points the vertical migration profile of (137)Cs was obtained. These profiles are separated into two groups with different behaviour, one of which includes clay and loam soils and the other containing sandy soils. For both groups of profiles the parameters of the convective-diffusive model, which describes the vertical migration of (137)Cs in the soil, v (apparent convection velocity) and D (apparent diffusion coefficient) were calculated.
    Journal of environmental radioactivity 06/2011; 102(6):589-97. · 1.47 Impact Factor

Publication Stats

1 Citation
123 Views
2.94 Total Impact Points

Institutions

  • 2011–2012
    • Ciemat-Centro Investigaciones Energéticas, Medioambientales Y Tecnológicas
      Madrid, Madrid, Spain
    • Universidad del País Vasco / Euskal Herriko Unibertsitatea
      • Departamento de Ingeniería Nuclear y Mecánica de Fluidos
      Bilbao, Basque Country, Spain