Late Holocene valley-bottom aggradation and erosion in the SouthLoupRiver Valley, Nebraska
The chronology of aggradation and erosion is developed from ten radiocarbon ages. After discussing fluvial erosion and floodplain aggradation in the SouthLoupRiver Valley, the paper reconstructs the late Holocene alluvial records of the North
and Middle LoupRiver Valleys from published reports and articles.
I is younger than 900 C 14 yr B.P. Regional contemporaneity of valley alluviation in the eastcentral Great Plains suggests that climate has controlled long-term sediment storage in the SouthLoupRiver valley.
Ecological roles of river icings in the Tsichu River Valley, Northwest Territories, Canada in Sea level ice and climatic change.
Canada ; Caribou ; Ecologie ; Elan ; Faune ; Fluviatile ; Glaciel ; Géographie de l'Amérique ; Loup ; Milieu humide ; Milieu riparial ; Synécologie descriptive ; Tsichu River ; Variation saisonnière ; Yukon ; Zoogéographie
alaxensis. Riche en éléments nutritifs, il est fortement utilisé comme nourriture d'hiver par les orignaux qui ne survivraient pas autrement. Leurs principaux prédateurs, les loups, se concentrent donc aussi sur les rives pendant l'hiver.
When is a River not a River ? Consideration of the legal definition of a river for geomorphologists practising in New South Wales, Australia
Australia ; Concept ; Definition ; Environmental management ; Geomorphology ; Legislation ; New South Wales ; Perception ; River bed ; Stream ; Water resources
Australie ; Concept ; Cours d'eau ; Définition ; Gestion de l'environnement ; Géomorphologie ; Lit fluvial ; Législation ; New South Wales ; Perception ; Ressource en eau
This paper examines why the definition of a river is an important and ongoing management issue, and outlines the development of legal definitions of river. Finally, the role of fluvial geomorphology is discussed with respect to the definition
of a river and its channel. This analysis will reveal whether the existing legislative framework adequately reflects the physical realities of rivers and watercourses so as to facilitate their conservation.
Neotectonic effects on sinuosity and channel migration, Belle Fourche River, western South Dakota
Belle Fourche River ; Etats-Unis ; Fluviatile ; Géographie physique ; Géométrie hydraulique ; Méandre ; Néotectonique ; South Dakota
In this paper the AA. attempt to show that anomalous downstream variations in meander migration rates and sinuosity along an 81-km-long section of a small meandering channel, the Belle Fourche River, are best explained as effects of localized
Sedimentary processes in the river-dominated Mvoti estuary, South Africa
Carrying capacity ; Earth surface processes ; Estuary ; Flood ; Natal ; Photointerpretation ; Sediment transport ; Sedimentology ; South Africa
The Mvoti River enters the Indian Ocean on the Natal coast of South Africa. The aims of the paper are a) to describe the geomorphology of the Mvoti river-mouth area, b) to outline sedimentary processes in the lower reaches of the river, c
Morphological characteristics of longitudinal profiles of rivers in the South Island, New Zealand
Altitude ; Analyse de régression ; Charge en suspension ; Cours d'eau ; Fluviatile ; Littoral ; Modèle mathématique ; Montagne ; Nouvelle-Zélande ; Plaine alluviale ; Profil longitudinal ; Relief ; Réseau de drainage ; South Island
Alluvial plain ; Altitude ; Coastal environment ; Drainage network ; Fluvial processes ; Longitudinal section ; Mathematical model ; Mountain ; New Zealand ; Regression analysis ; Relief ; South Island ; Stream ; Suspended load
In this paper, morphological characteristics of longitudinal profiles of rivers are analyzed in relation to mathematical functions in the South Island of New Zealand, and their regional characteristics are examined in relation to geomorphological
settings. Fiordland is excluded from the study area because distinctly large rivers are not developed.
Australia ; Carrying capacity ; Fluvial processes ; Hydrodynamics ; Methodology ; New South Wales ; River bed
Australie ; Capacité de charge ; Fluviatile ; Hydrodynamique ; Lit fluvial ; Méthodologie ; New South Wales
The dynamics of river beds can be assessed from scour and fill data obtained from scour chains. Chain insertion, anchoring and relocation can be determined with minimal manpower by utilising a set of tested employment methodologies
. These are described in sufficient detail to allow fluvial geomorphologists, ecologists and river engineers to more commonly utilise chains in studies of river stability and river response.
River classification for management: the geomorphology of the Sabie River in the Eastern Transvaal
Channel geometry ; Classification ; Fluvial processes ; Methodology ; River management ; South Africa ; Stream ; Transvaal
Analysis of the Sabie River has facilitated the development of a hierarchical classification suitable as a framework for fluvial research in variety of disciplines and at a veriety of scales. - (AJC)
Controls on channel form and channel change in the Bell River, Eastern Cape, South Africa
Cape Province ; Channel geometry ; Fluvial erosion ; Fluvial hydrology ; Meander ; South Africa ; Stream
Channel instability has occurred in the Bell River in the form of meander cutoffs, incipient meander cutoffs and general channel instability. This is documented for a 40 year period and the causes examined. - (AJC)
Linear dunes near the Orange River : origin, mineralogy and climate
Dune ; Eolian features ; Palaeogeography ; Quaternary ; Sand ; South Africa
An examination of the linear sand dunes on either side of the lower Orange River suggests they are of arid Quaternary origin and unrelated to river activity. - (AJC)
The geographer's journal : across the river lies another country
Culturel ; Etats-Unis ; Géographie de l'Amérique ; Louisiana ; Mississippi River ; Mode de vie ; Peuplement ; Récit de voyage ; Répartition de la population
Travel account by a cultural geographer of the settlement and people along the Mississippi Riversouth of New Orleans. - (DWG)
The development of a geomorphological classification system for the longitudinal zonation of South African rivers
Applied ecology ; Classification ; Ecosystem ; Longitudinal section ; South Africa ; Stream ; Water ; Water management ; Water quality
The recognition of the Reserve by the new South African Water Law poses challenges for river scientists. The ecological water requirement or environmental flow is recognised by that part of the Reserve know as the ecological Reserve
. If the ecological Reserve is to be implemented, it must first be defined and quantified. Standard procedures are being developed and are tested on contrasting three rivers. - (AJC)
Holocene valley aggradation driven by river mouth progradation : examples from Australia
Australie ; Cours d'eau ; Estuaire ; Géométrie hydraulique ; Holocène ; New South Wales ; Plaine d'inondation ; Profil longitudinal ; Sédimentation
Australia ; Channel geometry ; Estuary ; Floodplain ; Holocene ; Longitudinal section ; New South Wales ; Sedimentation ; Stream
The links between river mouth progradation and Holocene valley aggradation are examined with a model for the Macdonald and Tuross Rivers in south-eastern Australia. Both rivers have abandoned their main Holocene floodplains over the last 2000 years
Geochemical evidence for an eolian sand dam across the North and South Platte Rivers in Nebraska
Geochemical and geomorphic data from dune fields in southwestern Nebraska provide new evidence that the Nebraska Sand Hills once migrated across the North and South Platte rivers and dammed the largest tributary system to the Missouri River
. The Lincoln County and Imperial dune fields, which lie downwind of the South Platte River, have compositions intermediate between the Nebraska Sand Hills and northeastern Colorado dunes. The most likely explanation for the intermediate composition
is that the Lincol County and Imperial dunes are derived in part from the Nebraska Sand Hills and in part from the South Platte River.
The origin and development of the Nyl River floodplain wetland, Limpopo Province, South Africa: trunk-tributary river interactions in a dryland setting
Floodplain ; Humid environment ; Limpopo ; River bed ; Sedimentation ; South Africa
The Nyl River floodplain wetland, one of South Africa’s largest floodplain wetlands and a Ramsar site of international conservation importance, is located in an area of long-term and still active valley sediment accumulation. Creation
of accommodation space for sedimentation has previously been attributed to tectonic controls, but new investigations reveal that a more likely cause is progradation of coarse-grained tributary fans across the narrow river valley downstream of the main area
A geomorphic approach to the identification of river recovery potential
Australia ; Bank erosion ; Channel geometry ; Discharge ; Erosion control ; Floodplain ; Human impact ; Impact ; New South Wales ; Riparian vegetation ; River management ; Stream
Action anthropique ; Aménagement fluvial ; Australie ; Cours d'eau ; Débit ; Erosion des berges ; Géométrie hydraulique ; Impact ; Lutte contre l'érosion ; New South Wales ; Plaine d'inondation ; Végétation ripicole
In this paper, a generic procedure to measure river recovery is developed and applied in Bega catchment, on the south coast of New South Wales (NSW), Australia. The approach is based on analysis of geomorphic units and ergodic reasoning. Historical
data and field analyses are used to identify stages of river evolution throughout Bega catchment. From this, stages of river condition and pathways of adjustment are assessed for 3 river styles at different positions within the catchment. The geomorphic
Bedload transport processes in a braided gravel bed river model
Canterbury ; Capacité de charge ; Ecoulement ; Fluviatile ; Géométrie hydraulique ; Hydrologie appliquée ; Modèle ; Nouvelle-Zélande ; Rivière anastomosée ; South Island
Applied hydrology ; Carrying capacity ; Channel geometry ; Flow ; Fluvial processes ; Model ; New Zealand ; South Island
A 1:50 scale hydraulic model was designed, based on Froude number similarity and using hydrological and sediment data from a small braided gravel-bed river (the North Branch of the Ashburton River, Canterbury, New Zealand). The qualitative results
of the experiments using steady flows and unsteady flows reveal the nature of bedload transport (BLT) processes in braided rivers, particularly regarding variability of BLT in braided rivers.
Last interglacial sea levels on the south coast of New South Wales
Australie ; Datation ; Interglaciaire ; Ligne de rivage ; New South Wales ; Niveau marin ; Paléogéographie ; Quaternaire ; Thermoluminescence
Australia ; Dating ; Interglacial ; New South Wales ; Palaeogeography ; Quaternary ; Sea level ; Shoreline ; Thermoluminescence
This paper reports the sedimentary and thermoluminescence evidence from barrier beaches dating from the Last Interglacial at Middle Lagoon (also known as Tanja Lagoon) and Gillards Beach, 4-6 km north of the mouth of the Bega River, on the far south