Grain size trends associated with net sediment transport patterns: An example from the Belgian continental shelf

Gao, Shu; Collins, Michael B.; Lanckneus, Jean; Moor, Guy De; Lancker, V. Van

doi:10.1016/0025-3227(94)90029-9

Cited by 97 publications

(28 citation statements)

References 13 publications

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“…This model suggests that two types of grain-size trends are representatives of net transport pathways, i.e. in the net transport direction the two types of trends occur with a larger probability than in any other directions: type (1) --sediment becomes finer, better sorted and more negatively skewed, and type (2) --sediment becomes coarser, better sorted and more positively skewed [4,5] . Such an approach to grain-size trend analysis has been widely used in marine environments, e.g.…”

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confidence: 98%

“…The wide uses of the grain-size trend model can be explained by the fact that the derived sediment transport pathways have been validated by in-situ measurements [5] . Since seawater covering the seabed prevents direct observation of sediment movement on the bed, it is an important method to combine the proxies of sediment transport (e.g.…”

mentioning

confidence: 99%

“…Such an approach to grain-size trend analysis has been widely used in marine environments, e.g. estuaries, coastal bays, intertidal flats, tidal inlets, tidal sandbanks and continental shelves [5][6][7][8][9][10][11][12] . Nevertheless, the mechanism for the formation of grain-size trends, especially the quantitative information and hydrodynamic significance contained in the grain-size trend, is still unknown and further studies are required.…”

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Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast

et al. 2006

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A MIDAS-400 customized data acquisition system has been used for the high-resolution sediment dynamic measurements over the Dafeng intertidal flats of northern Jiangsu during 6 tidal cycles from July 3 to July 10, 2003. The bed shear stress and bedload transport rates, in response to wave-current interactions, are calculated, which indicate that wind waves enhance the bottom shear stress and bedload transport rates. At the station for measurements, bedload transport was directed to seaward, with a sediment discharge of 30 -150 kg·m −1 per tidal cycle. The surficial sediment samples were collected from a grid with 10 m spatial intervals over a rectangle 2×10 4 m 2 experimental area, near the MIDAS-400 during the spring tide of July 4, 2003, and the neap tide of July 9, 2003. In addition, leveling survey was undertaken to obtain the detailed topography of the sampling area. Grain-size trend analysis of the sediment samples shows that the bedload transport patterns are complex, mainly controlled by the hydrodynamics and local geomorphology (e.g. tidal creeks) over the intertidal flats. Furthermore, the grain-size trends pattern during the neap tide rather than during the spring tide is consistent with the calculated bedload transport, and the grain-size trend vectors for the spring tide are larger than those for the neap tide, indicating that the sampling thickness of surficial sediment during the neap tide may contain the information on the geomorphological evolution (or sediment deposition/erosion) from the spring to the neap tide.In the marine environment, it is often difficult to identify the net sediment transport pathway because of the complicated hydrodynamics and sediment sources. Gao and Collins have re-examined a 1-D model originally derived by McLaren and Bowles and developed a 2-D model of grain-size trend analysis, which makes it possible to obtain sediment transport pathways from the spatial information on the 2-D grain-size distribution pattern [1 -3] . This model suggests that two types of grain-size trends are representatives of net transport pathways, i.e. in the net transport direction the two types of trends occur with a larger probability than in any other directions: type (1) --sediment becomes finer, better sorted and more negatively skewed, and type (2) --sediment becomes coarser, better sorted and more positively skewed [4,5] . Such an approach to grain-size trend analysis has been widely used in marine environments, e.g. estuaries, coastal bays, intertidal flats, tidal inlets, tidal sandbanks and continental shelves [5][6][7][8][9][10][11][12] . Nevertheless, the mechanism for the formation of grain-size trends, especially the quantitative information and hydrodynamic significance contained in the grain-size trend, is still unknown and further studies are required.In-situ measurements provide original data sets which can be used not only as the start of the study, but also as the basis for verification of the result. The wide uses of the grain-size trend model can be explained by the fact ...

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Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast

et al. 2006

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“…However, other studies have shown that, under particular conditions, different trend cases can be found (e.g. Gao et al 1994;Asselman 1999;Carriquiry and Sánchez 1999;Carriquiry et al 2001;Ríos et al 2002). All possible trend cases were thus investigated in a methodical approach.…”

Section: Choice Of Trend Casesmentioning

confidence: 99%

Confirmation of beach accretion by grain-size trend analysis: Camposoto beach, Cádiz, SW Spain

et al. 2013

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An application of the grain size trend analysis (GSTA) is used in an exploratory approach to characterize sediment transport on Camposoto beach (Cádiz, SW Spain). In May 2009 the mesotidal beach showed a well-developed swash bar on the upper foreshore, which was associated with fair-weather conditions prevailing just before and during the field survey. The results were tested by means of an autocorrelation statistical test (index I of Moran). Two sedimentological trends were recognized, i.e. development towards finer, better sorted and more negatively skewed sediment (FB-), and towards finer, better sorted and less negatively or more positively skewed sediment (FB+). Both vector fields were compared with results obtained from more classical approaches (sand tracers, microtopography and current measurements). This revealed that both trends can be considered as realistic, the FB+ trend being identified for the first time in a beach environment. The data demonstrate that, on the well-developed swash bar, sediment transported onshore becomes both finer and better sorted towards the coast. On the lower foreshore, which exhibits a steeper slope produced by breaking waves, the higherenergy processes winnow out finer particles and thereby produce negatively skewed grain-size distributions. The upper foreshore, which has a flatter and smoother slope, is controlled by lower-energy swash-backwash and overwash processes. As a result, the skewness of the grain-size distributions evolves towards less negative or more positive values. The skewness parameter appears to be distributed as a function of the beach slope and, thus, reflects variations in hydrodynamic energy. This has novel implications for coastal management.

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“…As a result, two-dimensional treatment of the data was proposed, together with a different statistical test for the determination of 'no transport conditions'. This 2D grain size trend analysis (GSTA) has been applied widely to a variety of environments, such as: closed embayments (Gao and Collins, 1992); sandbanks (Gao et al, 1994); the inner continental shelf (Gao and Collins, 1994a,b); river floodplains (Asselman, 1999); estuaries (Mallet et al, 2000); tidal inlets (Friend et al, 2006); a ridge and runnel system (Pedreros et al, 1996) and sea straits (Cheng et al, 2004). Most of these studies applied GSTA on a regional scale, with only rare application of the method to smaller-scale environments (Pedreros et al, 1996).…”

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confidence: 99%

The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density

2008

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Grain size trends associated with net sediment transport patterns: An example from the Belgian continental shelf

Cited by 97 publications

References 13 publications

Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast

Interpreting grain-size trends associated with bedload transport on the intertidal flats at Dafeng, central Jiangsu coast

Confirmation of beach accretion by grain-size trend analysis: Camposoto beach, Cádiz, SW Spain

The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density

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