Showing papers in "Marine Geology in 1981"

TL;DR: In the geologic record some of the most accurate gauges of changes in sea level are the sediment type, geometry and diagenesis of carbonate shelves and platforms as discussed by the authors.

TL;DR: In this article, the effects of animal tracks and fecal pellet production on the critical entrainment velocity of marine sediments were examined experimentally and the results showed that animal tracking doubled boundary roughness and decreased critical entraining velocity by 20%.

TL;DR: In this article, the importance of the major periodic elements in coastal inlet flows and their potential contribution to the net transport of bedload materials is discussed, with the aid of a numerical model featuring a closed hypsometric (area-height) representation of basin storage-volume-channel-flow relationships in a typical basin and inlet system at Wachapreague, Virginia, on the East Coast of the United States.

TL;DR: Nittrouer et al. as discussed by the authors used boxcoring of the upper 1/2 m of sediment to predict the formation of sedimentary strata in an allochthonous shelf environment: the Washington continental shelf.

TL;DR: In this article, an instrumentation system consisting of an array of electronic sensors, including an electromagnetic current meter, a surface-piercing resistance wave gauge, and a five-element array of optical back-scatterance sensors, was developed that continuously measures: flow velocity, water depth, and suspended sediment concentration profiles in the nearshore zone.

TL;DR: In this paper, a detailed seismic mapping of the Messinian erosional surface in the Nile Delta region is presented, based on a model of the initial drawdown of the Mediterranean Sea with occasional sudden sporadic falls.

TL;DR: The main parameters controlling suspended-sediment transport in and out of the Gironde estuary are river flow and tides, which combine to control water mixing, density circulation and the trapping of suspended sediment in the turbidity maximum as mentioned in this paper.

TL;DR: In this paper, a relative sea-level curve for Delaware, obtained from radiocarbon dates on basal peats, rises smoothly from 25 m below present sea level 10,000 years B.P.

TL;DR: In this article, four major factors control sediment dispersal along the southeast African continental margin: morphology of the upper continental margin, wave regime and wind-driven circulation; influence of the Agulhas Current; and sediment supply.

TL;DR: In this paper, the authors define facies belts: a rhythmic sequence of ooze and graded beds on the basin floors, subdivided into a basin-margin belt of coarse, thick turbidites and basin interior with fine turbidite; slope facies change with increase in height and declivity from accretionary to bypass to erosional regimes.

TL;DR: In this article, a perturbation expansion and flume experiments were conducted to find a preferred ratio of sand ribbon spacing to water depth (∼4:1) for unstratified channel flow conditions.

TL;DR: In this article, the distribution and transport paths of particulate matter in the southern North Sea and the Wadden Sea are discussed, where the main direction of transport is along the Dutch coast to the north.

TL;DR: In this paper, the size distributions of sediment deposited on the sea-bed are a function of non-lognormal size distributions from particles composing sub-laminae, and they also show that water turbidity cannot be used to infer the downward flux of particles.

TL;DR: Hine et al. as discussed by the authors showed that offbank sand transport along open, leeward bank margins along the northern Bahamas can be traced to cyclic periods of relative quiescence followed by moments of intense sediment movement.

TL;DR: In this paper, bedload transport measurements in a large-scale sedimentary system on the British continental shelf were described and the effects of waves on both measured and predicted rates were briefly considered and the predicted directions of sediment movement compared with those inferred from sedimentological data.

TL;DR: In this paper, the Latemar buildup is used to illustrate the main character of a Lower Ladinian buildup on the slopes of the Southern Alps of Italy, with additional data for the slope taken from Mt. Coldai (Civetta) and Sass da Putia.

TL;DR: The island of Grand Cayman, in the western Caribbean, has an extensive mangrove swamp vegetation as discussed by the authors, which is generally underlain by a transgressive sequence of sediments.

TL;DR: The Belluno Trough is a narrow and elongate basin on the northwestern corner of the Apulian Plate continental margin this paper, bounded by two shallow-water carbonate banks (Trento and Friuli Platforms).

TL;DR: Coarse-grained, low-carbonate sediments with high abundances of quartz and feldspar in the northerly areas of the Arabian Sea close to land reflect significant terrigenous sediment in fluxes primarily from the Indus River, and to some extent from other sources as discussed by the authors.

TL;DR: Coleman et al. as mentioned in this paper collected 13,000 km of bathymetry and overlapping side-scan sonar data over a 4450-km2 area of the eastern Nile River shelf.

TL;DR: In this article, large-scale experiments on non-channelized turbidity currents show that a wide flow opening angle forms and a rapid dilution of the current with distance takes place, resulting in tongue-shaped isopachs.

TL;DR: In this article, a 3 km wide corridor across the Norwegian Trench was surveyed in detail with high-resolution, side-scan sonar and sub-bottom profiler (boomer) in order to study pockmarks.

TL;DR: In this paper, six types of carbonate buildups are recognized and document the variability of depositional, paleo-oceanographic and tectonic processes on the eastern North American margin.

TL;DR: Man-made modifications of the Seine estuary have produced large geometric changes with important hydrographic and sedimentological consequences affecting estuary-shelf interrelationships as discussed by the authors.

TL;DR: Suspended-material concentrations in a salt-marsh tidal channel on Kiawah Island, South Carolina, ranged from 6 to 50 mg/l in March, 1977, and from 10 to 200 mg/lp in July-August, 1977 as discussed by the authors.

TL;DR: The carbon isotopic composition of the organic matter in fluvial and marine suspended matter falls in the range valid for continental organic matter (−25 to −28 ǫ) as mentioned in this paper.

TL;DR: In this paper, the emergence process involves development, by various means, of shallow platform areas on which subtidal shoals may form, where such shoals are protected from the erosive effects of the breaker zone, wave bore-currents transport sand over the shoals and accrete them to low intertidal highest tide levels.

TL;DR: In this paper, a more general formulation capable of dealing with all three types of processes in concert, a simple, discrete-time Markov model is generated, which deals explicitly only with particulate and not liquid phases.