Determining the causes of pleistocene stream-aggradation in the central coastal areas of Western Australia
The general geomorphological characteristics of the drainage basins and the details of the sedimentology/paleohydraulics suggest that stream aggradation was due to sediment yields exceeding stream capacity. However, from a consideration
of the mechanics of stream aggradation it is demonstrated that stream aggradation was a response to both sediment supply and base level controls.
Evidence for regional stream aggradation in the central Oregon Coast Range during the Pleistocene-Holocene transition
indicate that an aggradation episode of regional extent began during the Pleistocene-Holocene transition and that the main part of this aggradation event was of relatively short duration. Although documentation of this episode is the main theme of the paper
, the AA. also speculate about possible causes of stream aggradation in the region.
Aggradation surfaces and implications for displacement rates along the Wairarapa Fault, southern North Island, New Zealand
In this paper surface deformation of Last Glacial fluvial aggradation surfaces along the western edge of the Wairarapa Valley is described in terms of slip rates along the Wairarapa Fault over the last 60 ka or so.
Sedimentology of a fine-grained aggrading floodplain
The present study characterizes the entire spatial variation in sedimentological properties along a portion of the presently aggrading floodplain of the Galena River in southwest Wisconsin. Another theme of this study is the detailed
Late Holocene valley-bottom aggradation and erosion in the South Loup River Valley, Nebraska
The chronology of aggradation and erosion is developed from ten radiocarbon ages. After discussing fluvial erosion and floodplain aggradation in the South Loup River Valley, the paper reconstructs the late Holocene alluvial records of the North
The nature and rate of alluvial fan aggradation in a humid temperate environment, northwest Washington
In january 1983, 20 alluvial fans in the forested Cascade foothills experienced net aggradation in response to debris torrents and stream floods triggered by intense warm rains falling on antecedent snow. One trench revealed residues of 7 events
since 1720 B.P. The results suggest that accelerated aggradation may characterize later Holocene times.
Incremental aggradation on the Okavango Delta-fan, Botswana
This work has confirmed that channel switching is the result of aggradation within the channel systems. Initially, new channel systems are erosive but later in their evolution both channel bed and adjacent swamp (peat) areas begin to aggrade
Holocene valley aggradation and gully erosion in headwater catchments, south-eastern highlands of Australia
, depositional environments, and the chronology of aggradation and downcutting are considered. This study concerns headwater basins which are upstream of the limits of permanent channels but occasionally have been invaded by deep gully networks.
Permafrost aggradation caused by tephra accumulation over snow-covered surfaces : examples from the Hekla-2000 eruption in Iceland
The aim of this paper is an analysis of tephra accumulation on a pre-eruption winter snow cover and its influence on permafrost aggradation. Based on multi-annual field observations at the Hekla volcano, southern Iceland, a conceptual model
Holocene valley aggradation driven by river mouth progradation : examples from Australia
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
Laboratory study of aggradation in alluvial channels
L'origine de l'aggradation des chenaux alluviaux est multiple. L'A. présente un de ses aspects: occurrence du phénomène lorsque les sédiments qui affluent ont un volume supérieur à la capacité de charge du cours d'eau. Etude expérimentale avec une
Proglacial aggradation and changes in braided channel patterns during a period of glacier advance: an alpine example
Etude sur six ans de l'avancée du glacier des Bossons. Cette avancée se traduit par une nette aggradation de la vallée proglaciaire et par un accroissement de la densité des chenaux anastomosés. (CG).
Cyclic aggradation and downcutting, fluvial response to volcanic activity, and calibration of soil-carbonate stages in the western Grand Canyon, Arizona
In the western Grand Canyon, fluvial terraces and pediment surfaces, both associated with a Pleistocene basalt flow, document Quaternary aggradation and downcutting by the Colorado River, illuminate the river's response to overload and the end
of overload, and allow calibration of soil-carbonate stages and determination of downcutting rates. Four downcutting-aggradation cycles are present. The current downcutting rate, 11-14m/1000 yr, likely is a response both to the end of late Pleistocene
This paper intends to separate the effects of the upriver control and the downriver control on the aggradation of the lower Yellow River and to discuss historical changes of factors influencing the river aggradation.
Transport and storage of bed material in a gravel-bed channel during episodes of aggradation and degradation : a field and flume study
The AA. examine transport-storage relations during cycles of aggradation and degradation by augmenting observations of 3 events of channel aggradation and degradation in Cuneo Creek, a steep gravel-bed channel in northern California
, with measurements from a series of flume runs modeling those events. Variations in channel morphology, and surface bed texture during runs that modeled the 3 cycles of aggradation and degradation were similar to those observed in Cuneo Creek and provide confidence
in interpretations of the history of change : Cuneo Creek aggraded rapidly as it widened, shallowed, and braided, then degraded rapidly before armoring stabilized the channel. Such morphology-driven changes in transport capacity may explain the formation of flood
This paper deals with the mountain front alluvial fans in the semi-arid areas of Murcia and Almeria provinces. It attempts, by mapping the location of alluvial fans, then their classification into aggrading or dissecting fans, to identify the extent
to which the mountain fluvial systems are buffered by aggrading alluvial fans or exhibit channel continuity through the mountain front environment. It further considers the implications of climatically induced changes between aggradational and dissectional
River mouth bar formation, riverbed aggradation and channel migration in the modern Huanghe (Yellow) River delta, China
This paper addresses the recent (1970s-1990s) processes of river mouth bar formation riverbed aggradation and distributary migration in the Huanghe River mouth area, in the light of station-based monitoring, field measurements and remote sensing
Aggradation and dissection sequences on spanish alluvial fans: influence on morphological development
Des ressemblances entre les cônes alluviaux quaternaires sont identifiées dans le sud-est de l'Espagne. Les phases d'aggradation du pré-Würm culminent avec les croûtes calcaires à la surface de ces cônes. Elles sont suivies par les phases de