Dernière mise à jour le : 20 janvier 2011

Contrasting behaviour of two riparian wetlands in relation to their location in the hydrographic network

DESCRIPTION

Although many studies have focused on the hydrological behaviour and classification of wetlands, the wide diversity of wetlands makes a clear and operational view difficult. The objective of this work is to compare the organisation and behaviour of two riparian wetlands (RWs) located, respectively, along Strahler order-2 and order-5 streams of the Scorff River catchment (Brittany, France). Groundwater table dynamics were monitored at the RWs during one hydrological year. Hydrochemistry was characterised during hydrological periods of high and low hydraulic head. The results show clearly the contrast in geomorphological and pedological organisation between the two RWs. In addition, the RW along an order-2 stream exhibited a strong hydrological connectivity with the adjacent hillslope whereas the RW along an order-5 stream showed a strong hydrological connectivity with the adjacent stream. We also observed the contrast between conditions favourable for high and permanent denitrification but on low nitrogen fluxes for order 2, and conditions less favourable to denitrification but on strong nitrogen fluxes for order 5. The relation between the contrasting hydrological and hydrochemical behaviour of these two RWs and their stream orders is discussed from the literature and local observations of the catchment. The results support the hypothesis of a relation between stream order and the hydrological and hydrochemical behaviour of the RWs and thus a catchment-scale organisation which may be taken into consideration in management strategies.

NOTICE BIBLIOGRAPHIQUE DETAILLÉE

keyboard_arrow_right Titre : Contrasting behaviour of two riparian wetlands in relation to their location in the hydrographic network
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Mérot Philippe, Cudennec, Christophe , Montreuil, O.
keyboard_arrow_right Date de publication : 20 janvier 2011
keyboard_arrow_right Editeur(s) : Unité mixte de recherche Géosciences Rennes (UMR 6118)
keyboard_arrow_right Tags thématiques : ressource en eau, bassin versant, dénitrification, eaux souterraines, azote, zone humide
keyboard_arrow_right Mots-clés libres : halides/Brittany/dissolved organic carbon/chlorides/riparian environment/drainage patterns/nitrates/strategy/stream order/nitrogen/denitrification/
keyboard_arrow_right Localisation : SCORFF
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right N° d'édition (ISBN,DOI...) : 10.1016/j.jhydrol.2011.05.049
keyboard_arrow_right Collection : Journal of Hydrology

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