Analisi del rapporto afflussi-deflussi in piccoli bacini impostati su substrati impermeabili (Contributo in volume (capitolo o saggio))

Type
Label
  • Analisi del rapporto afflussi-deflussi in piccoli bacini impostati su substrati impermeabili (Contributo in volume (capitolo o saggio)) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Aucelli P.P.C.; Caloiero T.; De Angelis A.; Gaudio R.; Rosskopf C.M. (2006)
    Analisi del rapporto afflussi-deflussi in piccoli bacini impostati su substrati impermeabili
    Brigati, Genova (Italia) in Erosione idrica in ambiente mediterraneo: valutazione diretta e indiretta in aree sperimentali e bacini idrografici, 2006
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Aucelli P.P.C.; Caloiero T.; De Angelis A.; Gaudio R.; Rosskopf C.M. (literal)
Pagina inizio
  • 145 (literal)
Pagina fine
  • 157 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
  • Erosione idrica in ambiente mediterraneo: valutazione diretta e indiretta in aree sperimentali e bacini idrografici (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 13 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR; Università della Calabria; Università del Molise (literal)
Titolo
  • Analisi del rapporto afflussi-deflussi in piccoli bacini impostati su substrati impermeabili (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-88-8782-225-0 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Rodolfi G. (literal)
Abstract
  • Soil erosion by surface waters is one of the main problems affecting the hilly slopes of the Adriatic flank of the Molise region, mainly used for agricultural purposes. These slopes are mainly developed on geologic formations of Tertiary and Quaternary age which are prevalently made of marls, clays and sandstones, and only subordinately of carbonate rocks. The erosion phenomenon is strongly dependent on the surface runoff, which in turn depends on the rainfall entity and distribution, and on the characteristics and local energies of the relief, the hydraulic conductivity, the saturation degree of the substratum and the vegetation cover. A correct analysis of surface water erosion and its controls, therefore, needs a more detailed knowledge on the hydrologic response of slopes and river network to rainfall. The numerous rainfall-runoff models known in the literature are not always able to describe complex configurations like those characterising the drainage basins located in the hilly to low-mountainous sectors of the Molise region. In particular, the geologic formations outcropping in such basins are complex both from a structural and lithologic viewpoint, and made of prevalent pelitic components. The application of the SCS-CN rainfall-runoff to two hydrologic events registered in two sub-basins of the Rivo Torrent watershed- located in the medium sector of the Trigno valley (Molise) - showed how difficult it is to simulate the hydrologic response, in terms of both hydrograph shape and peak discharge, time to peak and runoff coefficient. In the present paper are presented the results of simulations performed with a different rainfall-runoff model, based on the Instantaneous Unit Hydrograph. Discharge data were measured in the same previously studied sub-basins of the Rivo Torrent which are instrumented with flumes at their outlets and characterized by soils with a generally low hydraulic conductivity. Rainfall data are coming from two rain gauges located about 2-3 km from the outlets, outside the monitored sub-basins. The assessment of the discharges revealed a runoff lower than that expected for similar hydrographical unities, and runoff coefficients less than 1%. The high observed detention may therefore be related to the presence of the soil-regolith cover, reaching thicknesses even greater than 2 min the morphologically stable areas, and their capacity to store - particularly at the beginning of the humid phase - a huge amount of rainfall. The stored rainfall is successively turned back to the watercourses as trough-flow. The adopted linear reservoir method, which uses the IUH, is based on the water detention principle, and resulted more adapt than the SCS-CN method for the assessment of the hydrologic response in the studied sub-basins. The obtained results may be improved by using similar methods., as the Geomorphologic Instantaneous Unit Hydrograph. (literal)
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