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| Abascal-zorrilla, Noelia; Vantrepotte, Vincent; Huybrechts, Nicolas; Ngoc, Dat Dinh; Anthony, Edward J.; Gardel, Antoine. |
| The estuarine turbidity maximum (ETM) zone occurs in river estuaries due to the effects of tidal dynamics, density-driven residual circulation and deposition/erosion of fine sediments. Even though tropical river estuaries contribute proportionally more to the sediment supply of coastal areas, the ETM in them has been hardly studied. In this study, surface suspended particulate matter (SPM) determined from OLI (Operational Land Imager)-Landsat 8images was used to gain a better understanding of the spatio-temporal dynamics of the ETM of the tropical Maroni estuary (located on the Guianas coast, South America). A method to estimate the remotely-sensed ETM location and its spatiotemporal evolution between 2013 and 2019 was developed. Each ETM was defined from... |
| Tipo: Text |
Palavras-chave: Estuarine turbidity maximum; Landsat-8; Tropical estuary; Mud banks; French Guiana. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00641/75263/75468.pdf |
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| Tamura, Toru; Nguyen, Van Lap; Oanh Ta, Thi Kim; Bateman, Mark D.; Gugliotta, Marcello; Anthony, Edward J.; Nakashima, Rei; Saito, Yoshiki. |
| Since the 1990s the Mekong River delta has suffered a large decline in sediment supply causing coastal erosion, following catchment disturbance through hydropower dam construction and sand extraction. However, our new geological reconstruction of 2500-years of delta shoreline changes show that serious coastal erosion actually started much earlier. Data shows the sandy coast bounding river mouths accreted consistently at a rate of +2 to +4 km(2)/year. In contrast, we identified a variable accretion rate of the muddy deltaic protrusion at Camau; it was<+1 km(2)/year before 1400 years ago but increased drastically around 600 years ago, forming the entire Camau Peninsula. This high level of mud supply had sharply declined by the early 20th century after a... |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76858/78081.pdf |
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| Besset, Manon; Gratiot, Nicolas; Anthony, Edward J.; Bouchette, Frédéric; Goichot, Marc; Marchesiello, Patrick. |
| The question of the rampant erosion of the shorelines rimming the Mekong River delta has assumed increasing importance over the last few years. Among issues pertinent to this question is how it is related to mangroves. Using high-resolution satellite images, we compared the width of the mangrove belt fringing the shoreline in 2012 to shoreline change (advance, retreat) between 2003 and 2012 for 3687 cross-shore transects, spaced 100 m apart, and thus covering nearly 370 km of delta shoreline bearing mangroves. The results show no significant relationships. We infer from this that, once erosion sets in following sustained deficient mud supply to the coast, the rate of shoreline change is independent of the width of the mangrove belt. Numerous studies have... |
| Tipo: Text |
Palavras-chave: Mangroves; Mekong river delta; Shoreline erosion; Coastal squeeze; Sediment supply. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61617/65645.pdf |
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| Besset, Manon; Anthony, Edward J.; Bouchette, Frederic. |
| The inception, growth, and decline of numerous large and small river deltas on Earth have been strongly influenced by human population dynamics and interventions on catchments, notably deforestation and reforestation. Over the last half century, the effects of catchment conditions in determining fluvial sediment supply have been exacerbated or moderated by dams and reservoirs. The sediment balance of river deltas, crucial in terms of delta shoreline stability, advance or retreat, and subsidence, has, in turn, been affected by variations in fluvial sediment supply. The shoreline mobility and resulting subaerial coastal area changes of a selection of 54 of the world's deltas was quantified over 30 years based on data culled from the literature and from... |
| Tipo: Text |
Palavras-chave: River deltas; Delta shoreline mobility; River sediment supply; Dams; Delta vulnerability; Delta erosion. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00504/61529/65524.pdf |
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| Anthony, Edward J.; Brunier, Guillaume; Gardel, Antoine; Hiwat, Michael. |
| The 350-km long coast of Suriname, South America, is part of a unique system in the world characterized by large-scale mud supply from the Amazon and exposed to Atlantic waves. Large banks migrate alongshore from the Amazon to the Orinoco delta, separated by ‘inter-bank’ zones. Banks dissipate waves, partially weld onshore, and are colonized by mangroves, whereas waves in inter-bank areas cause shoreline erosion, mitigated where rare cheniers develop. Cheniers assure coastal protection and recreational and ecosystem services, notably providing nesting sites for marine turtles. Cheniers are also under pressure from sand mining. In order to gain a better understanding of how these cheniers form and evolve, a study was conducted on Braamspunt beach, a major... |
| Tipo: Text |
Palavras-chave: Chenier; Amazon-Orinoco coast; Mud bank; Muddy Guianas coast; Beach morphodynamics. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00489/60088/63426.pdf |
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| Jolivet, Morgane; Anthony, Edward J.; Gardel, Antoine; Brunier, Guillaume. |
| On the 1500 km-long mud-dominated Guianas coast of South America, between the mouths of the two mega-rivers, the Amazon and the Orinoco, debouch numerous small rivers draining the humid tropical/equatorial Guiana Shield. The geomorphic development of the mouths of these rivers reflects interactions among water discharge, fluvial sediment load, and the alongshore migration of Amazon-derived mud banks alternating with inter-bank areas. The mouth of the Maroni River, astride the French Guiana-Suriname border, shows advanced estuarine infill and geomorphic development characterized by a western (downdrift) side comprising numerous recent cheniers and an eastern (updrift) side bound by an old (>2000 years B.P.) chenier. A multi-decadal analysis of the beach... |
| Tipo: Text |
Palavras-chave: River mouth; Estuarine beach; Amazon-Orinoco coast; Mud bank; Beach morphodynamics. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62041/66187.pdf |
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