On Sea-Beaches and Sandbanks

Cornish, Vaughan

doi:10.2307/1774749

Cited by 29 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sorting by particle shape and size is one of most studied features of modern gravel beaches (Cornish, 1898;Berthois, 1951 ;van Andel, Wiggers & Maarleveld, 1954;Bluck, 1967Bluck, , 1969Carr, 1969Carr, , 1971Carr, Gleason & King, 1970;Dobkins & Folk 1970;Humbert, 1968;Matthews, 1980;Orford, 1975;Orford & Carter, 1982). The principal mechanism for shape selection cited in these papers is based on the suspension and pivotability potential of particles.…”

Section: Textural Zonationmentioning

confidence: 99%

Progradational gravel beach sequences in a moderate‐ to high‐energy, microtidal marine environment

Massari¹,

Parea²

1988

Sedimentology

179

153

View full text Add to dashboard Cite

The anatomy of progradational gravel beaches was analysed in two different tectonic settings: the strongly subsiding Messinian foreland basin of the eastern Southern Alps and the rising Pleistocene marine terraces of the outer margin of the Apenninic chain. Progradation took place near the mouths of fan‐delta or braid‐delta distributaries debouching in microtidal landlocked basins (palaeo‐Adriatic and palaeo‐Ionian seas). A wind‐wave climate, comparable to that of the present‐day, was characterized by periodic intense storm activity. Most of the beachface progradation is thought to have taken place during the post‐storm recovery and fair‐weather stages, whereas the impact of storms is mostly recorded by the cutting of erosional surfaces on the beachface and by emplacement of poorly‐sorted and coarse‐grained gravels on the shoreface by storm‐intensified seaward‐trending flows and behind the highest berms by washover processes. Analysis of the sequences led to the identification of a number of typical divisions which are differently developed in the two settings compared here. The characteristics of the Apenninic sequences suggest a strongly variable wind‐wave climate, with periodic changes from a relatively dissipative barred morphology during storms, accompanied by strong longshore currents and rip development, to a more reflective state, typical of recovery and fair‐weather stages. The Southern Alpine sequences, on the other hand, are characterized by poor evidence of barred morphology and of longshore currents and widespread effects of shear‐ and gravity‐sorting in the lower‐beachface gravels. These features indicate a comparatively more reflective average state, due to location of beaches along the deeply embayed head of the palaeo‐Adriatic, and the very narrow directional width of the incoming wave spectrum, which was almost shore‐normal most of the time. In addition to well‐developed shape zonation of gravels, the common presence of wave‐generated gravel megaripples in the Southern Alpine sequences indicates the greater influence of long‐period waves, due to the greater available fetch distances. In both settings the cyclicity is thought to be genetically related to minor changes of sea‐level.

show abstract

Section: Textural Zonationmentioning

confidence: 99%

Progradational gravel beach sequences in a moderate‐ to high‐energy, microtidal marine environment

Massari¹,

Parea²

1988

Sedimentology

179

153

View full text Add to dashboard Cite

show abstract

“…V. CORNISH (1898) states that the height of the ridges depends on the material of which they are built up; thus, fine-grained material and a heavy swell of the sea will result in the formation of the lowest ridges.…”

Section: Beach Ridgesmentioning

confidence: 99%

Ice margin features in the Julianehåb District, South Greenland

Weidick¹

1963

bullggu

View full text Add to dashboard Cite

The present report deals with the extension of the ice margin deposits in the Julianehåb district, South Greenland. An attempt is made to establish a Holocene chronology for the ice margin deposits within the region on the basis of their association with raised marine shorelines, combined with a determination of fluctuations of the glaciation limits of the individual stages in Holocene times. As the Narssarssuaq region in the north-eastern part of the district contains numerous extensive ice deposits, this region is treated in more detail than the other localities within the district. On the basis outlined above, it is attempted to establish a relative chronology for the ice margin deposits in the Narssarssuaq region. The remaining deposits within the district are then tentatively incorporated in the chronological scheme for the Narssarssuaq region. After the deglaciation of the district during the last phases of the Wisconsin, four periods of stagnation or readvance of the glacier lobes and the ice caps (four "stages") seem to have given rise to the formation of ice deposits. The earliest of these stages is the Niaqornakasik stage (older Dryas??), succeeded by the Tunugdliarfik stage (probably younger Dryas), the Narssarssuaq stage (probably Roman time), and the maximum extension of the ice in historie times (ca. 1750-1900 A.D.). The variation in the volume of the ice coverings (the inland ice and the Julianehåb ice cap) during the period from the Tunugdliarfik stage to the present day is studied. The superficial conditions of the ice covering above an altitude of ca. 1,700 m do not seem to have altered much since the Tunugdliarfik stage. Finally, deposits from former ice-dammed lakes in the Narssarssuaq region are treated. All the deposits from such lakes found here seem to show that all the lakes at the glacier front had a maximum height of the water level of 120-150 m. This is in accordance with J.W. Glen's theory of subglacial outbursts of ice-dammed lakes.

show abstract

“…Literature on the transformation of wave skewness and asymmetry over LCBs is sparse. Cornish (1898) observed that the onshore velocity under wave crests was more effective at moving coarse sediment than the seaward velocity related to wave troughs. This observation was consistent with the theory of Stokes (1847): the onshore velocity related to a wave crest is larger and of shorter duration than the seaward velocity associated with a wave trough, arising from a wave shape characterised by peaked crests and flat troughs.…”

Section: Introductionmentioning

confidence: 98%