Analysis of beach morphodynamics on the Bragantinian mangrove peninsula (Pará, North Brazil) as prerequisite for coastal zone management recommendations

Krause, Gesche; Soares, C

doi:10.1016/j.geomorph.2003.08.006

Cited by 19 publications

(11 citation statements)

References 29 publications

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“…The beach is defined as the area stretching from the dune crest to the closure depth (e.g. Masselink and Short 1993;Van Rijn et al 2003;Krause and Soares 2004), and it includes the shoreline that represents the physical interface between land and sea-water (Dolan et al 1980;Boak and Turner 2005). The historical analysis of the shoreline changes was performed through the comparison of topographic maps, orthophotos, Differential Global Position System (DGPS) data and Google Earth satellite images, which allowed delineating the shoreline position change between the year 1870 and year 2019.…”

Section: Determination Of Shoreline Changementioning

confidence: 99%

Shoreline evolution and modern beach sand composition along a coastal stretch of the Tyrrhenian Sea, southern Italy

Morrone

Ietto

2021

J. Palaeogeogr.

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This contribution focuses on a multidisciplinary research showing the geomorphological evolution and the beach sand composition of the Tyrrhenian shoreline between Capo Suvero promontory and Gizzeria Lido village (Calabria, southern Italy). The aim of the geomorphological analysis was to reconstruct the evolutionary shoreline stages and the present-day sedimentary dynamics along approximately 6 km of coastline. The results show a general trend of beach nourishment during the period 1870–2019. In this period, the maximum shoreline accretion value was estimated equal to + 900 m with an average rate of + 6.5 m/yr. Moreover, although the general evolutionary trend is characterized by a remarkable accretion, the geomorphological analysis highlighted continuous modifications of the beaches including erosion processes. The continuous beach modifications occurred mainly between 1953 and 1983 and were caused mainly by human activity in the coastal areas and inside the hydrographic basins. The beach sand composition allowed an assessment of the mainland petrological sedimentary province and its dispersal pattern of the present coastal dynamics. Petrographic analysis of beach sands identified a lithic metamorphi-clastic petrofacies, characterized by abundant fine-grained schists and phyllites sourced from the crystalline terrains of the Coastal Range front and carried by the Savuto River. The sand is also composed of a mineral assemblage comparable to that of the Amato River provenance. In terms of framework detrital constituents of QFL (quartz:feldspars:aphanitic lithic fragments) and of essential extraclasts, such as granitoid:sedimentary:metamorphic phaneritic rock fragments (Rg:Rs:Rm), sand maturity changes moderately from backshore to shoreface, suggesting that transport processes had a little effect on sand maturity. Moreover, the modal composition suggests that the Capo Suvero promontory does not obstruct longshore sand transport from the north. Indeed, sands displaced by currents driven by storm-wave activity bypass this rocky headland.

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Section: Determination Of Shoreline Changementioning

confidence: 99%

Shoreline evolution and modern beach sand composition along a coastal stretch of the Tyrrhenian Sea, southern Italy

Morrone

Ietto

2021

J. Palaeogeogr.

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“…ADCP surveys in the open bay over sandy bottom temporarily suffered blackouts in the current measurement during strong spring tides. This was probably caused by tidal transport of the upper centimeters of the substrate, thus generating erosion and large displacements of sediment (Krause and Soares, 2004) which is an important factor for disturbance and recolonization of benthic communities (e.g. Thrush et al, 1996).…”

Section: Resultsmentioning

confidence: 99%

A floating device for stationary hydroacoustic sampling in shallow waters

Krumme

Hanning

2005

Fisheries Research

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“…Em Ajuruteua, no entanto, dado que ao longo do ano em toda a face da praia o sedimento dominante é areia fina bem selecionada (KRAUSE & SOARES, 2004;ALVES & EL-ROBRINI, 2006;LIMA et al, 2007), é pouco provável que a textura dos sedimentos tenha desempenhado papel de grande importância na estruturação da meiofauna. Modificações na estrutura das comunidades de meiofauna relacionadas a mudanças na granulometria dos sedimentos seriam esperadas caso houvesse variações marcantes no tamanho médio dos grãos (MCLACHLAN et al, 1981;'OLAFSSON, 1991), como se observa ao passar de praias dissipativas para reflectivas (SHORT, 2003;RODRÍGUEZ et al, 2003).…”

Section: Methodsunclassified

Composição e variabilidade espaço-temporal da meiofauna de uma praia arenosa na região amazônica (Ajuruteua, Pará)

Gomes

Filho

2009

Iheringia, Sér. Zool.

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ABSTRACT. Composition and spatio-temporal variability of meiofauna community on a sandy beach in the Amazon region (Ajuruteua, Pará, Brazil). The present study investigates the spatio-temporal changes in the meiofauna community along the intertidal zone of Ajuruteua Beach, State of Pará, Brazil. Samples were collected during spring tides at different levels of the beach face every two months from April 2003 to February 2004. The material was sampled using a cylindrical corer (3.14 cm 2 ) and fixed with 5% saline formalin. In the laboratory, samples were sieved through a 0.063 mm mesh screen and the retained organisms were identified at higher taxonomic levels, counted and preserved in ethanol 70%. Meiofauna was composed of eight groups: Turbellaria, Nematoda, Tardigrada, Polychaeta, Oligochaeta, Acari, Copepoda and nauplius (Copepoda). Nematoda was the dominant group, representing 74% of total organisms, followed by Copepoda (19%). A clear faunal zonation was observed on three lines parallel to the shoreline, which showed significant differences in abundance, richness and density of the main taxonomic groups. The mean density was lowest in April and highest in December. The highest densities and richness were recorded in the mid intertidal zone, while the lowest values were recorded in the upper and lower intertidal zones. Meiofauna community was most rich and abundant during the dry months, although differences were not significant between climatic periods. The main factors involved in the spatio-temporal variations of meiofauna were wave and tidal action and salinity fluctuations. KEYWORDS.Benthos, meiofauna, community ecology, vertical zonation, Amazon. RESUMO.Este trabalho avalia a variabilidade espaço-temporal da meiofauna do médiolitoral na praia de Ajuruteua, Estado do Pará. As coletas foram realizadas a cada dois meses, entre abril de 2003 a fevereiro de 2004 durante as marés de sizígia, em diferentes zonas da praia. As amostras foram retiradas com um amostrador cilíndrico de 3,14 cm 2 e fixadas em formalina salina a 5%. Em laboratório, as amostras foram passadas em malha de 0,063 mm de abertura e os organismos retidos identificados em nível de grandes grupos taxonômicos, contados e fixados em álcool etílico a 70%. A meiofauna esteve representada por oito grupos: Turbellaria, Nematoda, Tardigrada, Polychaeta, Oligochaeta, Acari, adultos de Copepoda Harpacticoida e juvenis de Copepoda Harpacticoida. Nematoda foi o grupo dominante, representando 74% do total de indivíduos, seguido de Copepoda (19%). Pôde-se observar clara zonação horizontal da fauna, que se distribuiu em três faixas paralelas à linha de praia, com características significativamente distintas quanto à abundância, riqueza e densidade dos principais grupos taxonômicos. No médiolitoral médio foram observados valores significativamente mais elevados de riqueza e abundância, enquanto os valores mais baixos foram registrados no médiolitoral superior e inferior. A comunidade de meiofauna, ainda que não tenha variado significativamente entre períod...

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Analysis of beach morphodynamics on the Bragantinian mangrove peninsula (Pará, North Brazil) as prerequisite for coastal zone management recommendations

Cited by 19 publications

References 29 publications

Shoreline evolution and modern beach sand composition along a coastal stretch of the Tyrrhenian Sea, southern Italy

Shoreline evolution and modern beach sand composition along a coastal stretch of the Tyrrhenian Sea, southern Italy

A floating device for stationary hydroacoustic sampling in shallow waters

Composição e variabilidade espaço-temporal da meiofauna de uma praia arenosa na região amazônica (Ajuruteua, Pará)

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