Flood generation and sediment transport in experimental catchment affected by land use changes in the central Pyrennes

  1. García-Ruiz, J.M. 3
  2. Regüés, D. 3
  3. Alvera, B. 3
  4. Lana-Renault, N. 3
  5. Serrano-Muela, P. 3
  6. Nadal-Romero, E. 3
  7. Navas, A. 2
  8. Latron, J. 4
  9. Martí-Bono, C. 3
  10. Arnáez, J. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Estación Experimental de Aula Dei
    info

    Estación Experimental de Aula Dei

    Zaragoza, España

    ROR https://ror.org/056a37x91

  3. 3 Instituto Pirenaico de Ecología
    info

    Instituto Pirenaico de Ecología

    Zaragoza, España

    ROR https://ror.org/039ssy097

  4. 4 Universitat de Girona
    info

    Universitat de Girona

    Girona, España

    ROR https://ror.org/01xdxns91

Mostrar afiliaciones +
Revista:
Journal of Hydrology

ISSN: 0022-1694

Año de publicación: 2008

Volumen: 356

Número: 1-2

Páginas: 245-260

Tipo: Artículo

DOI: 10.1016/J.JHYDROL.2008.04.013 SCOPUS: 2-s2.0-44749087246 WoS: WOS:000257642600020 GOOGLE SCHOLAR

Otras publicaciones en: Journal of Hydrology

Resumen

Three small catchments (<2.5 km2 in size) were monitored in the Central Spanish Pyrenees to analyse the hydrological and geomorphological consequences of different land covers under the same climate scenario: (i) the San Salvador catchment represents a dense, undisturbed forest environment; (ii) the Arnás catchment corresponds to an old, abandoned cultivated area subjected to colonisation by plants; and (iii) the Araguás catchment consists in part of active badlands. The obtained results demonstrate that plant cover is a key factor, influencing (i) the seasonality and intensity of floods, (ii) the annual volume of discharge, and (iii) the suspended sediment concentration, total sediment yield and proportions of different types of sediment. The forested catchment tends to generate floods in late winter and spring, when the water table is close to the surface, and flood hydrographs are generally gentle, with solutes largely prevailing over suspended sediment. The old agricultural catchment produces in average twice the number of floods as that recorded in the forested catchment, with the highest floods recorded in autumn and spring; this catchment behaves as a complex mosaic, with a large spatial and temporal variability in terms of both sediment- and runoff-contributing areas; in addition, suspended sediment is equal to solutes, and bedload reaches a relatively high importance. Finally, the badland catchment reacts to all rainstorm events throughout the year, with a high suspended-sediment load. Sediment outputs from the Araguás catchment are two orders of magnitude higher than in the Arnás and San Salvador catchments. Suspended sediment concentrations exceed 300 g l-1 in the Araguás catchment, whereas they rarely exceed 20 g l-1 in the Arnás and rarely 1.5 g l-1 in the San Salvador catchment. © 2008 Elsevier B.V. All rights reserved.