Hydro-meteorological influences and multimodal suspended particle size distributions in the Belgian nearshore area (southern North Sea)

Fettweis, M.; Baeye, M.; Lee, Byung Joon; Chen, Peihung; Yu, Junhua

doi:10.1007/s00367-011-0266-7

Cited by 35 publications

(24 citation statements)

References 60 publications

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“…The floc size behaviour during flood and ebb periods in the present study is similar to results in the Belgian coast presented by Fettweis et al (2012).…”

Section: Flood and Ebb Tidal Phasessupporting

confidence: 91%

“…Indeed, in natural environments, flocculation is also impacted by a range of additional factors, such as hysteresis due to different time scales of aggregation and break-up ), spatial variability (van Leussen, 1999Fugate and Friedrichs, 2003), physico-chemical and biological effects van Leussen (1999), and sediment provenance (Jago and Jones, 1998;Bass et al, 2002;Fettweis et al, 2012).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…This is one of the most important and scarcely mentioned features of the cohesive sediment behaviour and its effect can be seen in the relationship of a number of different variables: turbulent stresses, SPM concentration, current speed, Reynolds stresses, turbulent kinetic energy and median floc size (e.g. Dyer, 1986;Fettweis et al, 2012;Wang et al, 2013). It has been stated that this effect is due to a time lag in the response between different variables (e.g.…”

Section: Flood and Ebb Tidal Phasesmentioning

confidence: 99%

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Effective energy controls on flocculation under various wave-current regimes

et al. 2016

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Transport of sediments is a critical process in the coastal zone because of its relation with coastal erosion, productivity and pollution. Of particular interest are the dynamics of suspended cohesive sediments, known as flocs, which can aggregate and break-up during the flocculation process. This changes their size, density, settling velocity and overall transport. Even though turbulence is widely accepted to be an important control on floc aggregation and break-up, specific and detailed floc behaviour is still not fully understood. The present study seeks to help in the understanding of the intra-tidal turbulence-induced flocculation under different current-wave regimes. Observations of floc size and currents at high sample rates are used to investigate the changes throughout a fortnightly cycle. The occurrence of waves at different stages during the sampling period enabled determination of three regimes of currents dominant, combined waves and currents,

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“…The floc size behaviour during flood and ebb periods in the present study is similar to results in the Belgian coast presented by Fettweis et al (2012).…”

Section: Flood and Ebb Tidal Phasessupporting

confidence: 91%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Flood and Ebb Tidal Phasesmentioning

confidence: 99%

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Effective energy controls on flocculation under various wave-current regimes

et al. 2016

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“…When SPM composition changes from very fine material (clay and silt particles or flocs) to silt‐sized or sand‐sized grains without changes in concentration, the optical backscatter signal will decrease, resulting in an apparent decrease in SPM mass concentration, without affecting SPM volume concentration. This apparent decrease has been observed at a nearby site during NE storm conditions when sand grains were resuspended [ Fettweis et al ., ]. However, as NE storms are not frequent these inaccurate SPM concentrations will only have a slight effect on the mean values.…”

Section: Discussionmentioning

confidence: 99%

Seasonality of floc strength in the southern North Sea

Fettweis

Baeye

Zande

et al. 2014

J. Geophys. Res. Oceans

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The suspended particulate matter (SPM) concentration in the high turbidity zones of the southern North Sea is inversely correlated with chlorophyll (Chl) concentration. During winter, SPM concentration is high and Chl concentration is low and vice versa during summer. This seasonality has often been associated with the seasonal pattern in wind forcing. However, the decrease in SPM concentration corresponds well with the spring algal bloom. Does the decrease of SPM concentration caused by changing wind conditions cause the start of algae bloom, or does the algae bloom decrease SPM concentrations through enhanced flocculation and deposition? To answer the question, measurements from 2011 of particle size distribution (PSD), SPM, and Chl concentrations from the southern North Sea have been analyzed. The results indicate that the frequency of occurrence of macroflocs has a seasonal signal, while seasonality has little impact upon floc size. The data from a highly turbid coastal zone suggest that the maximum size of the macroflocs is controlled by turbulence and the available flocculation time during a tidal cycle, but the strength of the macroflocs is controlled by the availability of sticky organic substances associated with enhanced primary production during spring and summer. The results highlight the shift from mainly microflocs and flocculi in winter toward more muddy marine snow with larger amounts of macroflocs in spring and summer. The macroflocs will reduce the SPM concentrations in the turbidity maximum area as they settle faster. Consequently, the SPM concentration decreases and the light condition increases in the surface layer enhancing algae growth further.

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“…In the dry season, floc breakup is strongly reduced and flocs settle faster; in combination with tidal pumping, this causes siltation in the shipping lanes. Fettweis et al (2012) recorded the size distributions of suspended particulate matter in bottom waters during storms in the Belgian nearshore sector of the southern North Sea. Particle size distributions (PSDs) were classified in terms of subtidal alongshore flow, by means of entropy analyses.…”

Section: Preamblementioning

confidence: 99%

Contributions from Particles in Europe (PiE) 2010, Villefranche-sur-Mer, France: an introduction

Mikkelsen¹,

Chami²,

Doxaran³

2012

Geo-Mar Lett

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This special issue of Geo-Marine Letters presents selected contributions from the international conference Particles in Europe (PiE) 2010 organized by Sequoia Scientific, Inc., and the Laboratoire d'Océanographie de Villefranche (LOV) on 15-17 November 2010 in Villefranche-sur-Mer, France, and guest-edited by Ole Mikkelsen, Malik Chami and David Doxaran. PiE was initiated in 2008, in order to promote and further our understanding of the importance of suspended particulate matter (SPM) for a very wide range of processes in the aquatic environment-from optics and acoustics, over sediment transport, to the global carbon balance. The papers in this special issue are in particular concerned with the interaction between SPM and water optical properties, as well as how to use optical proxy measurements to understand SPM processes. The next PiE conference is scheduled for 17-19 October 2012 in Barcelona, Spain. PreambleThe international conference Particles in Europe (PiE) 2010 was held on 15-17 November 2010 in Villefranche-sur-Mer, France, organized by Sequoia Scientific, Inc., and the Laboratoire d'Océanographie de Villefranche (LOV). Eight peerreviewed papers have been selected for inclusion in this special issue of Geo-Marine Letters, guest-edited by Ole Mikkelsen, Malik Chami and David Doxaran.In one way or the other, these contributions all deal with the measurement and understanding of suspended particulate matter (SPM) dynamics in coastal and inland waters, or with the influence of SPM on water optical properties. Several of these papers demonstrate the advantage of using optical proxy measurements of SPM: it allows for a significant increase in the amount of data related to SPM properties such as concentration, size, and organic content. In turn, this enables better studies of suspended sediment transport processes in order to gain knowledge on the dynamics and export of suspended matter from land into the coastal ocean, and further into the deep sea. The remainder of the papers is more concerned with the actual influence of SPM on water optical properties. In more than one case, their findings demonstrate the limitations of the optical proxy measurements. This is a topic of great importance for those actually using optical proxies to understand SPM processes. A synthesis of the focus of the papers found in this special issue is given below. et al. (2012) employed in situ bio-optical and ocean color remote sensing measurements to evaluate SPM dynamics in the Rhone River plume discharging into the Mediterranean Sea. They demonstrate that the remotely sensed particulate optical backscattering coefficient can serve as a robust proxy for SPM in the Rhone plume and, furthermore, that the SPM load is constrained largely within the upper 5 m of the water column during flood events. These findings can help improving predictions of SPM Synthesis Lorthiois

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Hydro-meteorological influences and multimodal suspended particle size distributions in the Belgian nearshore area (southern North Sea)

Cited by 35 publications

References 60 publications

Effective energy controls on flocculation under various wave-current regimes

Effective energy controls on flocculation under various wave-current regimes

Seasonality of floc strength in the southern North Sea

Contributions from Particles in Europe (PiE) 2010, Villefranche-sur-Mer, France: an introduction

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