Hydrodynamics ; Mathematical model ; Model ; Riparian vegetation ; Runoff ; Turbulence ; Water
Sur la base de représentations d'hydromécanique d'un milieu continu avec une structure complexe, on formule un modèle mathématique fermé spatialement homogène de l'écoulement d'eau en présence de végétationripicole supérieure.
humides en général et mise en évidence du déficit de recherche sur les systèmes ripicoles. Evaluation de la connaissance sur la nature et la dynamique des banques de semences ripicoles et des facteurs gouvernant l'érosion, le transport et le dépôt des
Description physiographique de la zone sud-est de Málaga. Etude de la végétation potentielle et tentative d'une approche pour une dynamique de la végétation. - (AAG)
tarissement phréatique exclusif. La connaissance de l'évolution des prélèvements ripicoles, de leurs impacts suivant les cours d'eau considérés, s'avère donc primordiale dès lors qu'une étude hydrologique détaillée est entreprise.
Mapovani vegetace rybniku s pouzitim fotointerpretacni metody. (Mapping of vegetation of ponds with use of photo-interpretation)
Carte de la végétation ; Cesky ; Géographie de l'Europe ; Milieu humide ; Photo-interprétation ; Tchécoslovaquie ; Végétation ; Végétationripicole
The littorals of ponds are often covered by dense vegetation not suitable for field mapping. The method of vertical photographical mapping is demonstrated on two ponds in Northern Bohemia. (MS).
Evolution récente de la contamination radioactive des écosystèmes aquatique et ripicole de la Meuse par les effluents de la centrale nucléaire de la Sena, Chooz, Ardennes françaises
Ardennes, dépt. ; Biogéographie ; Centrale nucléaire ; Chooz ; Contamination ; Ecosystème ; France ; Géographie de l'Europe ; Meuse, fleuve ; Pollution ; Synécologie fonctionnelle ; Végétationripicole
An extensive sampling survey of animals and aquatic and ripicolous plants was performed in September 1974 in the Upper Meuse, in order to determine the mean levels of radioactive contamination of the main constituents of the river ecosystem
The aim of this article is to summarize actual results of the field research of invasive neophytes' occurrence in the riverbank vegetation of the Labe River from Špindlerův Mlýn to Těchlovice (Děčín district). Results are presented for series
Impact of a flood on southern California riparian vegetation
Analyse de régression ; Biodiversité ; Biogéographie ; California ; Crue ; Ecosystème ; Etats-Unis ; Impact ; Végétationripicole
Biodiversity ; Biogeography ; California ; Ecosystem ; Flood ; Impact ; Regression analysis ; Riparian vegetation ; United States of America
This study assesses flood impacts on riparian vegetation in two watersheds within the Transverse Ranges. Data collected in 1993 were compared to baseline data from 1990 to measure the effect of a 1992 flood.
Various aspects of both allogenic and autogenic processes in riparian vegetation dynamics are discussed here; in particular how plants may promote bank stability and sedimentation, and river island development. Riparian restoration often fails
Riparian vegetation variability along perennial streams in central Arizona
Analyse multivariée ; Arizona ; Cours d'eau ; Crue ; Distribution spatiale ; Dynamique de la végétation ; Ecosystème ; Etats-Unis ; Géométrie hydraulique ; Statistique ; Végétationripicole
Arizona ; Channel geometry ; Ecosystem ; Flood ; Multivariate analysis ; Riparian vegetation ; Spatial distribution ; Statistics ; Stream ; United States of America ; Vegetation dynamics
This study clarifies linkages between fluvial hydrologic processes, fluvial landforms, and patterns of riparian vegetation populations by using a suite of geomorphic and hydrologic variables. 5 riparian vegetation populations were examined along 5
perennial streams in the transition zone of central Arizona. Canonical correspondance analysis (CCA) with a forward selection was used to assess quantitatively the role of stream power in riparian vegetation patterns.
Channel geometry ; Experimentation ; Meander ; Mississippi ; Riparian vegetation ; Stream ; Stream flow ; United States of America ; Vegetation
The aim of this study was to induce the location of the maximum surface velocity or thalweg of a straight, degraded stream channel to meander through the use of managed emergent vegetation. This study showed that flow velocity can be markedly
reduced within and near the vegetation zones, flow can be diverted toward the opposite bank, and vegetation density can control the magnitude of these effects. The following discussion will focus on design considerations for stream restoration
Les AA. étudient les principales unités géo-écologiques des cours d’eau la Florida et de Tres Pozos, deux affluents du fleuve Guadaira près de Séville. Ils analysent la végétationripicole caractérisée par une diversité géo-écologique et
actions visant à protéger la végétationripicole de ce sous-système.
Vegetation and channel variation; a case study of four small streams in southeastern Australia
Australie ; Cours d'eau ; Ecoulement fluvial ; Gravier ; Géométrie hydraulique ; Lit fluvial ; New South Wales ; Sable ; Végétation ; Végétationripicole
Australia ; Channel geometry ; Gravel ; New South Wales ; River bed ; Sand ; Stream ; Stream flow ; Vegetation
The purpose of this paper is to examine variations in vegetation along 4 small streams in the Illawara region of southeastern Australia, to develop appropriate vegetation categories or indices that reflect the influence of vegetation on channel
A new model to analyse the impact of woody riparian vegetation on the geotechnical stability of riverbanks
Arbre ; Canada ; Cours d'eau ; Erosion des berges ; Géotechnique ; Impact ; Modèle ; Ontario ; Système racinaire ; Végétationripicole
Bank erosion ; Canada ; Geotechnics ; Impact ; Model ; Ontario ; Riparian vegetation ; Stream ; Tree
The AA. present a geotechnical stability analysis for the planar failure of riverbanks, which incorporates the effects of root reinforcement and surcharge for mature stands of woody riparian vegetation. The analysis relies on a new method
of representing the root distribution in the soil, which evaluates the effects of the vegetation's position on the bank.
Quantifying the mechanical and hydrologic effects of riparian vegetation on streambank stability
Cours d'eau ; Erosion des berges ; Etats-Unis ; Géotechnique ; Lutte contre l'érosion ; Mississippi ; Modélisation ; Propriétés du sol ; Végétationripicole
Bank erosion ; Erosion control ; Geotechnics ; Mississippi ; Modelling ; Riparian vegetation ; Soil properties ; Stream ; United States of America
This paper reports a field monitoring and computer-modelling investigation that has been carried out in northern Mississippi to quantify the separate and combined hydrologic and mechanical effects of 3 different vegetation covers (mature trees
, clump grasses, and bare/cropped turf grass) on streambank stability. The results demonstrate the importance of hydrologic processes in controlling streambank stability, and highlight the need to select riparian vegetation based on hydrologic as well