Applying the caesium-137 technique for studying sediment redistribution at basin scale (Contributo in atti di convegno)

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Label
  • Applying the caesium-137 technique for studying sediment redistribution at basin scale (Contributo in atti di convegno) (literal)
Anno
  • 2000-01-01T00:00:00+01:00 (literal)
Alternative label
  • FERRO V., DI STEFANO C., CALLEGARI G., IOVINO F., PORTO P., VELTRI A., RIZZO S. (2000)
    Applying the caesium-137 technique for studying sediment redistribution at basin scale
    in Forest Hydrology, XXI Congresso Mondiale IUFRO, Kuala Lumpur (Malaysia), 8-12, 7-12 August 2000
    (literal)
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  • FERRO V., DI STEFANO C., CALLEGARI G., IOVINO F., PORTO P., VELTRI A., RIZZO S. (literal)
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  • Forest Hydrology (I) (Water quality) (literal)
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  • 8.030R-1 (literal)
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Titolo
  • Applying the caesium-137 technique for studying sediment redistribution at basin scale (literal)
Abstract
  • Identifying areas of the landscape that are mosi sensitive or susceptible to erosion stimulated lbe study of within-basin variability or tbe sediment delivery processes and tbe use of spatiaUy distributed models coupled with Geograpltical Infonnation SYsterns. Tbe progress or distributed models is hindered by tbe lack or measurements able to establish the link between tbe eroded soil leaving an area and tbe patterns or erosion and deposition occurring along tbc hydrauIic path from tOO considered area to the nearest stream reach. Tmcer techniques afforo an alternative lo the use of plots and a rneans of overcoming tbe problerns or measurement representativeness and spatial variability. The tracer most widely used in soil erosion and sediment yield studies is caesiwn-137, an artificial radionucIide, whicb was released into the environment as a result of above·ground thermonuclear weapons testing. Fallout deposition on the Iand surface occurred main1y with precipitation. When fallout caesium-137 comes in contact Witb soil, il is readily fixed or adsorbed on tbe organic and clay particles and subsequent movement by natural chemica1 and processes is limited. In tltis paper caesium-137 measurements available for two basins with different crop covers. located in Sicily an<:t in Calabria, are used for validating the Sediment Delivery Oistributed (SEDO) approach based on the Revised Universal Soil Loss Equation and tbe sedirnent delivery ratio or each morphological unit intò wltich the basin is divided.· For tbe Sicilian basin, whicb is used forwheat cropping, the predictive ability of the SEDD model is positivel)' tested comparing the calculated sediment yield values with the measured ones obtained by the caesiographic map and the proportional method of Martz and de Jong. For the Calabrian basin, which is covered by Euca/yptus occidenta/is Engl., the testing of tbe SEDD approaçh is carried out by comparing the calculated sediment yield and the caesium 1055 at tbe morpbological unit and basin scale. (literal)
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