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| DOI | 10.1016/J.CATENA.2018.01.035 | ||||
| Año | 2018 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Wood budgeting is a current approach for quantifying the spatial and temporal variations of in-channel large wood (LW). Despite its importance for a proper LW management, the assessment of LW budget is still a challenge because of the complexity of LW dynamics. Focusing on a 3.7 km-long gravel-bed reach of the Piave River (North-eastern Italy), this study proposes an attempt to assess a short-term (1 year) LW budget as a consequence of ordinary floods (RI < 1 yr). Lateral recruitment, mobilization and deposition of LW were investigated by two field surveys conducted at the beginning and end of the study period. The lateral input was evaluated by measuring, positioning and tagging all standing trees (diameter >= 0.1 m) within a 20 m-wide buffer strip along the floodplain and island perimeters. Bank erosion was checked by measuring the riverbanks with a differential Global Positioning System (dGPS), during the first and second survey. Contemporarily, the position and characteristics of each fluvial wood element (diameter >= 0.1 m and length >= 1 m) within the active channel was determined. These short-term analyses revealed that ordinary floods are not able to induce relevant variations in the LW abundance and redistribution of in-channel wood. Nevertheless, the results highlighted the role of riverbank erosion in supplying LW to the active channel. Episodic inputs of LW from bank erosion were also observed during ordinary flood events, introducing 33% (0.21 m(3).km(-1)) of the total LW input amount. Results on LW transport showed that, in the Piave River, both deposition and mobilization of LW may also occur during low flow conditions (i.e. 14% of bankfull stage) without causing important variations in the wood quantity. However, the low magnitude of floods was reflected in the small amount of LW involved in the input (0.4 m(3).km(-1)) and output (0.7 m(3).km(-1)) processes, pointing out that sites for deposition and mobilization of LW are conditioned by flood magnitude and morphological settings. The combination of recruitment, mobilization and deposition processes resulted in a slight decrease of LW storage (-0.07%), while including also the anthropic removal of LW the amount of wood storage decreased to -9.7%. Despite the short-term investigation, this work sheds further light on LW processes, providing useful results for the management of LW in wide piedmont rivers.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Tonon, A. | - |
Univ Padua - Italia
Università degli Studi di Padova - Italia |
| 2 | Picco, L. | Hombre |
Univ Padua - Italia
Universidad Austral de Chile - Chile Università degli Studi di Padova - Italia |
| 3 | Rainato, R. | Hombre |
Univ Padua - Italia
Università degli Studi di Padova - Italia |
| Fuente |
|---|
| University of Padova |
| University of Padova Research Projects CPDA149091 |
| University of Padova Research Projects |
| Agradecimiento |
|---|
| This research is funded by the "University of Padova Research Projects CPDA149091 - WoodAlp: linking Large Wood and morphological dynamics of gravel bed rivers of Eastern Italian Alps- 2014-16", "Relationship between sediment transport, riparian vegetation and Large Wood along a gravel bed river: the Piave River study case (North-East Italy) - DOR1695175" and by the "University of Padova Research Projects 'Sediment transfer processes in an Alpine basin: sediment cascades from hillslopes to the channel network-BIRD167919'". The authors would like to thank Regional Agency for Environmental Prevention and Protection of Veneto (ARPAV), for technical information about the hydropower plants and Alison Garside for revising the English language. The authors also thank the Editor Estela Nadal Romero and three anonymous reviewers for constructive comments, which improved the manuscript. |
| This research is funded by the “ University of Padova Research Projects CPDA149091 - WoodAlp: linking Large Wood and morphological dynamics of gravel bed rivers of Eastern Italian Alps- 2014-16”, “Relationship between sediment transport, riparian vegetation and Large Wood along a gravel bed river: the Piave River study case (North-East Italy) - DOR1695175 ” and by the “ University of Padova Research Projects ‘Sediment transfer processes in an Alpine basin: sediment cascades from hillslopes to the channel network- BIRD167919 ’”. The authors would like to thank Regional Agency for Environmental Prevention and Protection of Veneto (ARPAV), for technical information about the hydropower plants and Alison Garside for revising the English language. The authors also thank the Editor Estela Nadal Romero and three anonymous reviewers for constructive comments, which improved the manuscript. |