The chenier coast of Suriname: Modern and geological development

Augustinus, Pieter G.E.F.; Hazelhoff, L.; Kroon, Aart

doi:10.1016/0025-3227(89)90129-1

Cited by 45 publications

(31 citation statements)

References 11 publications

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“…Allison et al (2000) have shown that the mud banks migrate over a relict shelf mud surface in shallow inshore water depths of 5 to 20 m. The spacing between the banks may reflect seasonality in the Amazon mud supply system and variations in the intensity of the trade winds (Eisma et al, 1991;Allison et al, 1995Allison et al, , 2000. The effective 859 dissipation of wave energy by the banks has been reported by several workers (Wells and Coleman, 1981;Augustinus et al, 1989;Prost, 1990;Eisma et al, 1991;Allison et al, 1995). The deeper shoreface areas between the banks allow for more efficient wave energy transmission to the terrestrial shoreline.…”

Section: Introductionmentioning

confidence: 83%

Short‐term changes in the plan shape of a sandy beach in response to sheltering by a nearshore mud bank, Cayenne, French Guiana

Anthony

Gautier

Dolique

et al. 2002

Earth Surf Processes Landf

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Montjoly is a headland-bound embayed sandy beach in Cayenne, French Guiana, that shows long-term plan shape equilibrium in spite of periodic changes in accretion and erosion that alternately affect either end of the beach. These changes are caused by mud banks that move alongshore from the Amazon. The mechanisms involved in changes in the plan shape of the beach in response to the passage of one of these mud banks were monitored between 1997 and 2000 from airborne video imagery and field work. The beach longshore drift to the northwest, driven by the incident easterly to northeasterly swell usually affecting this coast, became temporarily reversed as the mud bank, migrating from east to west, initially sheltered the southeastern end of the beach. The difference in exposure to waves engendered a negative wave height gradient alongshore towards the southeast, resulting in the setting up of a cell circulation and counter-active longshore drift from the exposed northwestern sector to the southeast. Sand eroded from the exposed sector accumulated first in the southeastern, and then the central sectors of the beach. The effect of increasing beach sheltering by the mudbank moving west is highlighted on the videographs by an 'arrested' pattern of beach shoreline development. The videographs show hardly any changes in beach plan shape since January 1999, due to sheltering of the beach from wave attack by the mud bank. It is expected that the eroded sector will recover in the future as the mud bank passes, leading to re-establishment of the northwesterly sand drift. This temporally phased bi-directional drift within the confines of the bounding headlands results in a rare example of mud-bank-induced beach rotation, and probably explains the long-term equilibrium plan shape of Montjoly beach.

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Section: Introductionmentioning

confidence: 83%

Short‐term changes in the plan shape of a sandy beach in response to sheltering by a nearshore mud bank, Cayenne, French Guiana

Anthony

Gautier

Dolique

et al. 2002

Earth Surf Processes Landf

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“…The coastal development study at various scale levels is based on extensive field observations and measurements in the past, complemented by the interpretation of aerial photographs (Augustinus, 1978(Augustinus, , 1980(Augustinus, , 1993Augustinus et al, 1989).…”

Section: Methodsmentioning

confidence: 99%

“…About 20% of this mud supply is transported westward along the North coast of South America (Eisma et al, 1991), roughly 150 million tons in suspension and 100 million tons stored in the migrating mudbanks (Wells and Coleman, 1978). The mudbanks are separated by deeper interbank areas where cheniers develop, if sufficient sand and/or shells are available (Augustinus, 1978(Augustinus, , 1980Augustinus et al, 1989). At the terrestrial side of the coastal system, mangrove forests grade into brackish and freshwater swamps.…”

Section: Introductionmentioning

confidence: 99%

The influence of the trade winds on the coastal development of the Guianas at various scale levels: a synthesis

Augustinus

2004

Marine Geology

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The coastal development of the Guianas is dominated by extensive, shoreface-attached and alongshore westward migrating mudbanks. The behaviour of these mudbanks is mainly determined by a combination of the large supply of Amazon-borne silt and clay and the trade wind generated wave action. In the front zone of the mudbanks, fluid mud is formed. As a result, the incoming waves are strongly attenuated and deposition is favoured. At their rear side, compacted clay deposits are eroded by waves. The mudbanks, migrating in this manner, are the driving mechanism in the development of the smallest coastal unit, which consists of a mudbank and the eastward adjacent interbank area.Eisma et al. [Neth. J. Sea Res. 28 (1991) 181] has demonstrated that the frequency of the northeast trade wind, which blows towards the coast of the Guianas, in the windy season (January till April), shows a systematic change in time. For the period 1953 -1986, there is evidence that the frequency of winds coming from directions between 50j and 80j (roughly eastnortheast) increases. The same applies to the wind velocity from that direction. In the last 10 years a reversal of these trends appears to occur.For a more or less east -west directed coastal section, e.g. the coastline of Suriname, a more easterly direction of the northeast trade wind results in an increased longshore wave energy flux in the coastal waters. This causes an increase in length of the mudbanks, at the detriment of the usually eroding interbank parts of the coast. This is evidenced by the large-scale coastal development during the related period, demonstrating an increasing length of the mudbanks and consequently an increasing net accretion. It is hypothesised that this development will reverse if the new trends in wind direction and velocity develop further.At the geological scale, it is considered that a coincidence of a systematic increase of more northerly directed wind frequencies and a fall in sea level are responsible for the two erosive interruptions in the generally accreting coastal plain during the Young Holocene Period. D

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“…Many regions worldwide appear similar to the chenier plain coast of Louisiana; chenier plains, extensive mudflats, and high sediment supply are present in China (Wang and Ke, 1989;Xitao, 1989;Saito et al, 2000Saito et al, , 2001Wang et al, 2002c), the Atlantic coast of northern South America (Eisma and Van der Marel, 1971;Wells and Coleman, 1981a, b;Augustinus et al, 1989;Daniel, 1989;Prost, 1989;Allison et al, 1995a, b) and in many other areas (e.g., Augustinus, 1989;Flemming, 2002; see Chapter 1).…”

Section: Response Of Other Mud-rich Shorelines To Energetic Conditionsmentioning

confidence: 99%

“…Much Amazon sediment is incorporated into fluid-mud suspensions on the inner shelf (Kineke and Sternberg, 1995;Kineke et al, 1996). Amazon sediment also affects coastal regions up to 1000 km north of the river mouth, promoting mudflat progradation and chenier plain growth in northern Brazil, French Guiana, Surinam, and Guyana (Figure 3-20; e.g., Delft Hydraulics Laboratory, 1962;Vann, 1969;Eisma, 1971;Wells and Coleman, 1981a, b;Augustinus et al, 1989;Daniel, 1989;Prost, 1989;Eisma et al, 1991;Allison et al, 1995aAllison et al, , b, 2000bAllison and Lee, in press). The structure and dynamics of mud deposits near the Amazon mouth and along the northeastern South American coast were studied as part of the AmasSeds (A Multidisciplinary Amazon Shelf Sediment Study)…”

Section: Two Analogues For the Louisiana Chenier Plainmentioning

confidence: 99%

Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico

Draut¹

2003

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The chenier coast of Suriname: Modern and geological development

Cited by 45 publications

References 11 publications

Short‐term changes in the plan shape of a sandy beach in response to sheltering by a nearshore mud bank, Cayenne, French Guiana

Short‐term changes in the plan shape of a sandy beach in response to sheltering by a nearshore mud bank, Cayenne, French Guiana

The influence of the trade winds on the coastal development of the Guianas at various scale levels: a synthesis

Fine-grained sedimentation on the Chenier Plain Coast and inner continental shelf, northern Gulf of Mexico

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