Morphodynamics of intertidal bars in wave-dominated coastal settings — A review

Masselink, Gerd; Kroon, Aart; Davidson‐Arnott, Robin

doi:10.1016/j.geomorph.2005.06.007

Cited by 180 publications

(132 citation statements)

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“…Tidal fluctuations coupled with cell circulation system and beach profiles result in several types of shore morphodynamic features such as ridge and runnel structures, ripples and sand bars. The morphology and associated dynamics of these features have been well described by several authors like King et al (1949) and Masselink et al (2006) amongst others. Previous authors like NEDECO (1961), Burke (1972), Ibe and Awosika (1986), Awosika et al (1994Awosika et al ( , 2000 amongst others have described the general dynamics (Shepard and Inman, 1951).…”

Section: Introductionmentioning

confidence: 59%

Morphodynamics and features of littoral cell circulation observed from sequential aerial photographs and Davies drifter along a section of the strand coast East of the Niger Delta, Nigeria

Awosika¹,

Folorunsho²,

Imovbore³

2013

J. Oceanogr. Mar. Sci.

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Sequential aerial photographs taken along a section of the Strand coast (longitude 07°35'00" and latitude 8°30' 20"E) East of the Niger Delta Nigeria were anaylsed to understand tidal inundation and resulting morphodynamic features as well as the littoral cell circulation patterns. Records from a Davis drifter deployed in the Qua Iboe River that traveled parallel to the shoreline were also used to confirm the littoral cell patterns. The analysis of the sequential aerial pictures shows that the cell circulation patterns consist of waves with oblique angles which approach in a Southwesterly direction generating an Eastward flowing longshore current. Rip currents are recognised in the surf zone as seaward flowing surfs. Interpretation of a picture of the exposed beach during low tide shows tidally induced morphodynamic features such as rhythmic ripples, perpendicular sand ridges and runnels (hollows) which tend to be welded to the shoreline. Drifter number 26602 deployed inside the Qua Iboe River on 3 March 2001 at 0300 h confirmed the West to East longshore current direction. Though this study employed the use of short term data, it has enhanced the understanding of oceanographic processes, erosional, and depositional processes in the intertidal zone of the stud area.

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Section: Introductionmentioning

confidence: 59%

Morphodynamics and features of littoral cell circulation observed from sequential aerial photographs and Davies drifter along a section of the strand coast East of the Niger Delta, Nigeria

Awosika¹,

Folorunsho²,

Imovbore³

2013

J. Oceanogr. Mar. Sci.

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“…High diversity is often found where there is an optimal balance of these variables, i.e., physical and chemical conditions are intermediate , Hourston et al 2005, Gingold et al 2010). However, some, more heterogeneous beaches display intertidal sandbars intercalated by depressions, which retain water when tides recedes, across their wide intertidal zone (Masselink et al 2006); this habitat is therein called runnel and those beaches that bear it are so-called macrotidal ridge-and-runnel beach. On these beaches, for example De Panne Beach in Belgium, studied by Maria et al (2013b), the two microhabitats (runnels and sandbars) contain different nematode communities, which are reflected in dissimilar across-shore zonation.…”

Section: Mesoscale Distribution Of Nematode Communitiesmentioning

confidence: 99%

Sandy beaches: state of the art of nematode ecology

Maria

Vanaverbeke

Vanreusel

et al. 2016

An. Acad. Bras. Ciênc.

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In this review, we summarize existing knowledge of the ecology of sandy-beach nematodes, in relation to spatial distribution, food webs, pollution and climate change. We attempt to discuss spatial scale patterns (macro-, meso-and microscale) according to their degree of importance in structuring sandy-beach nematode assemblages. This review will provide a substantial background on current knowledge of sandybeach nematodes, and can be used as a starting point to delineate further investigations in this field. Over decades, sandy beaches have been the scene of studies focusing on community and population ecology, both related to morphodynamic models. The combination of physical factors (e.g. grain size, tidal exposure) and biological interactions (e.g. trophic relationships) is responsible for the spatial distribution of nematodes. In other words, the physical factors are more important in structuring nematodes communities over large scale of distribution while biological interactions are largely important in finer-scale distributions. It has been accepted that biological interactions are assumed to be of minor importance because physical factors overshadow the biological interactions in sandy beach sediments; however, the most recent results from in-situ and ex-situ experimental investigations on behavior and biological factors on a microscale have shown promise for understanding the mechanisms underlying larger-scale patterns and processes. Besides nematodes are very promising organisms used to understand the effects of pollution and climate changes although these subjects are less studied in sandy beaches than distribution patterns.

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“…These peculiar beaches were subject to numerous publications that mainly describe their coastal dynamics (e.g. Short, 1991;Levoy et al, 1998;Ruessink, 1998;Voulgaris et al, 1998;Sipka and Anthony, 1999;Kroon and Masselink, 2002;Wijnberg and Kroon, 2002;Stépanian and Levoy, 2003;Anthony et al, 2004;Masselink, 2004;Masselink et al, 2006;van Houwelingen et al, 2006;Lashteh Neshaei et al, 2009). However, the associated bedforms generated over the ridges and runnels have less been investigated.…”

Section: Introductionmentioning

confidence: 99%

Bedforms in a tidally modulated ridge and runnel shoreface (Berck-Plage; North France): implications for the geological record

Vaucher

Pittet

Passot

et al. 2018

BSGF - Earth Sci. Bull.

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-Tidally modulated shoreface (TMS) corresponds to peculiar costal environments. The general morphology and the expressed bedforms are provided by the interplay of both waves and tides. The recognition of TMS in the fossil record still remains a difficult task. The study of one mega-tidal modern TMS in the north of France (Berck-Plage) provides new key criteria to identify this kind of coastal system in the rock record. Field investigation and digital mapping were realized at lowest tide during spring tide under fair-weather condition. The intertidal zone is characterized by a succession of several sand banks shore parallel separated by topographic lows that are defined as ridges and runnels. Seven distinct dominant bedforms are recognized: 3D current ripples, 3D asymmetrical ripples, 2D symmetrical ripples, 2D small symmetrical dunes, 2D large symmetrical dunes, 3D symmetrical dunes and plane beds. The upper stage plane bedding mainly composed the ridges while the six other bedforms are commonly found within the runnels or on the flanks of the ridges. Comparison of the bedforms of Berck-Plage with previous experimental studies on bedforms genesis proves that the necessary flow parameters for generating these bedforms belong to an oscillatory flow except for the 3D current ripples, which are formed by a unidirectional flow. This study confirms the dominance of oscillatory structures through the intertidal zone in a mega-tidal context and show that wave processes are more powerful than tide processes for bedform generation although during fair weather conditions. Based on the timing of genesis, the description and the repeated pattern of distribution of bedforms between two ridges is highlighted thus helping to propose a theoretical facies sequence for an intertidal zone characterized by ridges and runnels applicable to ancient sedimentary successions.Keywords: waves / tides / ridge and runnel / bedforms / stratigraphy / Berck-Plage / France Résumé -Structures sédimentaires d'une zone intertidale en barre et bâches dominée par la houle (Berck-Plage ; Nord de la France) : implications pour le registre sédimentaire ancien. Les plages et avant-plages sous l'influence de la houle et modulées par l'action de la marée, correspondent à des environnements côtiers particuliers. Leurs géomorphologies générales ainsi que les structures sédimentaires associées résultent de l'action combinée de la houle et de la marée. L'identification de ces environnements atypiques dans des successions sédimentaires anciennes demeure difficile. L'analyse d'un environnement mégatidal semi-diurne actuel dans le Nord de la France (Berck-Plage) a permis de fournir de nouveaux critères de reconnaissance pour ce type de système côtier hybride dans le fossile. Une étude de terrain ainsi qu'une cartographie numérique ont été réalisées à marée basse au cours d'une marée de vives-eaux. La zone intertidale est caractérisée par une succession de plusieurs bancs de sables parallèles à la côte et qui sont définies comme des barres (topographie po...

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Morphodynamics of intertidal bars in wave-dominated coastal settings — A review

Cited by 180 publications

References 56 publications

Morphodynamics and features of littoral cell circulation observed from sequential aerial photographs and Davies drifter along a section of the strand coast East of the Niger Delta, Nigeria

Morphodynamics and features of littoral cell circulation observed from sequential aerial photographs and Davies drifter along a section of the strand coast East of the Niger Delta, Nigeria

Sandy beaches: state of the art of nematode ecology

Bedforms in a tidally modulated ridge and runnel shoreface (Berck-Plage; North France): implications for the geological record

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