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Titre :
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Interactions between floodplain forests and overbank flows: data from three piedmont rivers of southeastern France
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Auteurs :
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H. Piégay
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Type de document :
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article/chapitre/communication
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Année de publication :
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1997
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Format :
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p. 187-196
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Langues:
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= Anglais
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Catégories :
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EAU
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Mots-clés:
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PLAINE D'INONDATION
;
FORET
;
DECHET VEGETAL
;
DEBIT DE COURS D'EAU
;
TOPOGRAPHIE
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Résumé :
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Spatial variations of flow are described and explained within the forested margins of three Rhone river tributaries during floods that occurred in 1992, 1993 and 1994. Observations were made on the scale of riparian forest corridors with cross-sectional analysis, and also on the scale of vegetation units located in the upstream reaches of floodplain channels using a 4000 m(2) sampling plot.The study of floodplain cross-sections does not always confirm relationships between flow depth and altitude or distance from the sampling point to the active channel. Orientation of flow slope Varies too much from one site to another and often within each site. Water can flow from the river channel into the forest and vice versa. Floodplain channels characterized by a how depth higher than flow depths observed in neighbouring forests laterally supply their margins. On the vegetation patches of the Mellon site (Ain river), food overflows are affected by a line of coarse woody debris (CWD) which changes location from pear to year. Thus, position, orientation and form of floodplain microchannels varied from one year to the next.
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Source :
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Global Ecology and Biogeography Letters, vol.6
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