Les mammouths nains (Mammuthus exilis) qui ont peuplé les Northern ChannelIslands au Quaternaire supérieur auraient pu traverser à la nage le détroit réduit à une largeur de 6km lors d'une régression marine. Il n'est pas nécessaire de retenir
Channel units in small, high gradient streams on Vancouver Island, British Columbia
The aim of this paper is to present a classification and descriptions of channel units in small, very high gradient mountain channels and to discuss the efficacy of the classification criteria : bedrock cascades, boulder cascades, rapids, chutes
; and to analyse their relation with hydrological and sedimentological processes. This article presents the first digital object-oriented dataset of islands, wetlands and channels with full spatial coverage of the Okavango Delta. Islands were divided into discrete
classes and the occurrence, size and density of island types was analysed in relation to physiographic regions and channels in various stages of development.
The aims of this study were : to classify the continuum of wet and dry areas into object-oriented classes of islands and wetland regions; to estimate the qualitative and quantitative distributions of these components throughout the Okavango wetland
Australia ; Canada ; Channel geometry ; Classification ; Concept ; Flood ; Floodplain ; Fluvial processes ; Meander ; River bed
Anastomosing rivers are characterized by multiple channels separated by islands excised from the floodplain. Their status relative to the continuum concept of channel pattern is assessed with channel pattern defined in terms of three variables: flow
strentgh, bank erodibility and relative sediment supply. Anastomosis may in certain cases represent a transitional form of channel pattern but there is no denying the longevity of some anastomosing systems.
Channel dredging, dredge spoil migration and downdrift. Impacts at a large tidal inlet, Tauranga Harbour, New Zealand
Channel ; Coastal dynamics ; Coastal environment ; Estuary ; Harbour ; Impact ; Intertidal zone ; New Zealand ; North Island ; Sand
Chenal ; Dragage ; Dynamique littorale ; Estuaire ; Impact ; Littoral ; North Island ; Nouvelle-Zélande ; Port ; Sable ; Zone intertidale
A major dredging programme to deepen the shipping channels at the Port of Tauranga has seen some 5 million m3 of mainly sandy sediment dredged from the shipping channels and dumped on the adjacent inner shelf. An Environmental Impact Assessment has
Channel geometry ; Floodplain ; Fluvial processes ; Ireland ; Island ; River bed ; Stream flow ; Tree ; Vegetation
This paper presents data on the flood response of channels in one of the last wooded, semi-natural anastomosing systems in Europe. The Gearagh, Ireland, is characterized by hundreds of small islands separated by interconnected channels of low slope
. Islands are relatively stable and wooded, with evidence of division by channel erosion and growth by in-channel sedimentation. Biotic components such as debris dams, tree root masses and tree-throw pits play a key role in the partitioning of flow
, and cause variations in channel velocities and the overbank velocity distribution. The implications for channel pattern maintenance are briefly discussed.
Semi-determinate hydraulic geometry of river channels, South Island, New Zealand
Analyse des données ; Cours d'eau ; Géographie de l'Océanie ; Géométrie hydraulique ; Lit fluvial ; Nouvelle-Zélande ; Réseau de drainage ; South Island
Treasure Island revisited. Jersey's offshore finance centre crisis : implications for other small island economies
Banque ; Centre financier offshore ; ChannelIslands ; Crise économique ; Finance ; Ile ; Impact économique ; Jersey ; Revenu national ; Royaume-Uni ; Réglementation
Bank ; ChannelIslands ; Economic crisis ; Economic impact ; Finance ; Island ; Jersey ; National income ; Offshore finance centre ; Regulation ; United Kingdom
Braided channel ; Carrying capacity ; Channel geometry ; Discharge ; Gravel ; Model ; New Zealand ; Numerical model ; Sediment load ; South Island ; Stream
Capacité de charge ; Charge solide ; Chenal anastomosé ; Cours d'eau ; Débit ; Gravier ; Géométrie hydraulique ; Modèle ; Modèle numérique ; Nouvelle-Zélande ; South Island
This paper outlines an approach for estimating the annual bedload yield of a braided channel. This procedure is based on the extension of the theory of flow and sediment transport in braided rivers recently presented by Paola (1996). The potential
Bassin-versant ; Classification ; Cours d'eau ; Glissement de terrain ; Impact ; Montagne ; Nouvelle-Zélande ; South Island
Classification ; Impact ; Landslide ; Mountain ; New Zealand ; South Island ; Stream ; Watershed
An inventory of 846 mass movements, mainly landslides, in 2 alpine regions of southwest New Zealand was created to explore the geomorphic impacts of slope-failure processes on river channels and valley floors. A nominal classification system
is introduced for characterizing : the physical contact nature between landslides and river channels; and the resulting geomorphic consequences for drainage. Dominant persistent geomorphic imprints of bedrock landslides include channel occlusions and landslide
Atoll ; Channel ; Coastal current ; Hydrodynamics ; Indian Ocean ; Island ; Marine environment ; Reef ; Sediment transport
Atoll ; Chenal ; Cocos Islands ; Courant littoral ; Hydrodynamique ; Ile ; Milieu marin ; Océan Indien ; Récif ; Transport sédimentaire
This study examines the hydrodynamic processes and sediment transport in 11 hoa (shallow cross-reef channels) in the Cocos (Keeling) Islands, Indian Ocean. Emphasis is on the characteristics of tide and wave-induced current processes and sediment
Geomorphic work during a 150-year storm : contrasting behaviors of river channels in a New Zealand catchment
Bank erosion ; Channel geometry ; Flood ; Floodplain ; Impact ; New Zealand ; River bed ; South Island ; Stream ; Watershed
Bassin-versant ; Cours d'eau ; Crue ; Erosion des berges ; Géométrie hydraulique ; Impact ; Lit fluvial ; Nouvelle-Zélande ; Plaine d'inondation ; South Island
The geomorphic work accomplished during an extreme storm event by 3 primary tributaries in the western Manawatu river catchment (New Zealand) is assessed using sequential aerial photographs. Areas of floodplain and channel erosion were quantified
as a measure of the work accomplished during floods triggered by a 150-year storm in February 2004. The contrasting amount of geomorphic work between these tributaries relates to valley floor and channel configurations, which prime discrete reaches
Channel change, bankfull and effective discharges on a vertically accreting, meandering, gravel-bed river
Braided channel ; Channel geometry ; Deforestation ; Meander ; Model ; New Zealand ; North Island ; Sediment budget ; Shear stress ; Stream ; Suspended load
Bilan sédimentaire ; Charge en suspension ; Chenal anastomosé ; Contrainte de cisaillement ; Cours d'eau ; Déboisement ; Géométrie hydraulique ; Modèle ; Méandre ; North Island ; Nouvelle-Zélande
field data to characterize the channel, and determine the bankfull discharge at different locations throughout the reach by routing known discharges through a one-dimensional flow model.
Come a nasty gale : the response to Hurricane Hugo on the island of Montserrat, West Indies
On September 17, 1989, a hurricane devastated this tiny island : trees were defoliated, floods repositioned river channels, and most dwellings were damaged. But the relief effort also reinforced community solidarity.―(DWG)
the complexity of the channel network, the avaibility of exposed gravel areas, and the presence of islands.
river channel system. Field observations of large wood storage illustrate that wood retention at 8 sites along the river reflects the presence and abundance of the features incorporated in the classification of geomorphological style, including
is controlled by low frequency, high magnitude flow events, possibly associated with glacial outburst floods. This is in marked contrast to process-form relationships in more dynamic alpine proglacial channels that are characterised by high rates of sediment