Accretion tectonics in the circum-Pacific regions.
Findings from recent studies in accretion-collision phenomena in the circum-Pacific mobile belts presented at the first international conference on accretion - collision tectonics (21 papers).
Factors influencing beach erosion and accretion a global review in Sandy beaches as ecosystems.
It is necessary on each sector of sandy coastline to consider all the factors and to decide which have been dominant in producing beach erosion and accretion. The attempts to analyse the advance or retreat of sandy coastlines in terms of volumetric
budgeting will characterise the next phase of research into beach erosion and accretion.
Behaviour of beach profiles during accretion and erosion dominated periods
The aim of this paper is to evaluate subaerial beach profile shapes from Moruya to determine the morphological characteristics of beach and associated foredune profiles in each of two periods recognized from a previous study : the accretion
Land accretion of the Yellow River delta as influenced by drainage basin factors
In this study, an effort has been made to elucidate the effect of changing human activities and precipitation on land accretion of the Yellow River delta, to provide a stronger basis for environmental management in the Yellow River drainage basin
The influence of the sea-land breeze regime on beach erosion and accretion: an exemple from Jamaica
Beach erosion and accretion on the Palisadoes, south-east Jamaica, is a diurnal phenomenon, caused by changes in wave form in response to the local sea-land breeze regime. Sea breezes generate destructive wave forms which remove sediment from
Vertical accretion rates in fluvial systems : a comparison of volumetric and depth-based estimates
This study compares depth- and volume-based estimates of sediment accumulation for well-dated vertical accretion sequences at Broomhaugh Island in the Tyne basin, northern England. High resolution dating control (based on heavy metal stratigraphy
and cartography) coupled with detailed reconstruction of channel geometry allows accumulation rates to be calculated for the last 300-400 years. The results show a marked disparity in the magnitude and pattern of vertical accretion rates between the 2 approaches.
Predicting vertical accretion rates at an archaeological site on the Mississippi River floodplain : Effigy Mounds National Monument, Iowa
This paper presents a case study of recent vertical accretion on a fluvial terrace of the Upper Mississippi River, within the Sny Magill Unit of Effigy Mounds National Monument. Two independent methods are presented to estimate recent vertical
accretion rates : one is based on Cs 137 analysis of sediment samples, the other is based on observed flood deposit thickness and magnitude frequency analysis. The projected accretion rates and time to burrial are subjected to large uncertainties because
Creation of dune depressions by foredune accretion in Thematic Issue II.
The results of this study document the mechanisms for formation of dune hollows by foredune accretion and identify the strong relationship between wave processes and location, orientation, and shape of depressions. Wind plays a role in the formation
Growth rates and two-mode accretion in the outher orogenic wedge-foreland basin system of Central Apennine (Italy)
Central Apennine orogenic wedge ; they progressively propagated towards the east, accreted the foredeep basin deposits and simultaneously shifted the depocenters of foredeep and wedge-top basin. The value obtained show that the late Miocene-Pleistocene
growth of this orogenic wedge can be envisaged as a cyclic repetition of two accretion mode. - (NF)
Floodplain construction by recent, rapid vertical accretion : Waipaoa River, New Zealand
The rate of vertical accretion during eight floods in the Waipaoa River basin, with recurrence intervals of 5 to 60 years, was determined by relating the floodplain stratigraphy at Mc Phail's bend to the 1948-1995 flood history. The sequence
of deposition is highly discontinuous, and the rapid vertical accretion is a response to a late 19th to early 20th century phase of deforestation in the headwaters that probably initiated a far greater change in suspended sediment yield than in discharge. Cross
Sediment accretion and organic carbon burial relative to sea-level rise and storm events in two mangrove forests in Everglades National Park
The AA. aimed to examine how sediment accretion and organic carbon (OC) burial rates in mangrove forests respond to climate change. Mass accumulation, accretion and OC burial rates were determined via 210Pb dating (i.e. 100 year time scale
) on sediment cores collected from 2 mangrove forest sites within Everglades National Park, Florida (USA). Enhanced rates were found in an upper layer that corresponded to a storm surge deposit. Accretion rates within the storm deposit were compared to overall
for OC burial in marine wetlands. With tropical storms being a frequent occurrence in this region the resulting storm surge deposits are an important mechanism for maintaining both overall accretion and OC burial rates.
Quantitative model of the growth of floodplains by vertical accretion
This paper describes a quantitative floodplain growth model based on the unsteady nature of the vertically accreting channel-expansion floodplains along the Powder River. This river is one of the few relatively large unregulated rivers in the United
Nd isotope evidence for dust accretion to a soil chronosequence in Hainan Island
-averaged dust deposition rates in the old sites. They calculate long term dust accretion rates to quantify the deposition. The results also underscore the potential for neodymium isotopes to constrain the origin of soils and paleosols.
Embryo dune development on a large, actively accreting macrotidal beach : Calais, North Sea coast of France
development over a flat 150-1000 m wide accreting upper beach, on the North Sea coast of France, near Calais. Net dune development over time depends on sustained strong winds and their orientation.
Rates of floodplain accretion in a tropical island river system impacted by cyclones and large floods
. Cs 137 activity in the floodplain stratigraphy showed a well-defined profile, with a clear peak at 115 cm depth. The high accretion rate over the last ca. 45 years is explained by the high frequency of tropical cyclones near Fiji (40 since 1970) which
Aggradation is occuring in the main channel and on the floodplain throughout the study reach. Infilling of the main channel occurs primarily by lateral accretion, while the floodplain accretes vertically through deposition of overbank sediment from