Observations of Suspended Particle Size Distribution on an Energetic Ebb-Tidal Delta

Pearson, Stuart; Prooijen, Bram C. van; Wit, Floris de; Meijer-Holzhauer, H.; Looff, A.P. de; Wang, Zheng Bing

doi:10.1142/9789811204487_0172

Cited by 6 publications

(16 citation statements)

References 9 publications

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“…Across the entire ebb‐tidal delta, the mean grain size (

D 50

) is 0.211 mm, with a standard deviation of 0.03 mm and a mud content (

<

0.063 mm) of 1% by volume (Pearson et al. ).…”

Section: Methodsmentioning

confidence: 99%

“…Maximum significant storm wave heights can be more than 6 m, with storm surges of over 2 m. The tidal wave propagates along the coast from west to east, and near Ameland the tidal range is 2 m. Maximum shore-parallel velocities are 0.5-1.0 m s 1 (Elias et al, 2012), and the tidal prism is 430 Mm 3 (Sha, 1989). Across the entire ebb-tidal delta, the mean grain size (D50) is 0.211 mm, with a standard deviation of 0.03 mm and a mud content (<0.063 mm) of 1% by volume (Pearson et al, 2019).…”

Section: Study Sitementioning

confidence: 98%

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Spatio‐temporal characteristics of small‐scale wave–current ripples on the Ameland ebb‐tidal delta

Brakenhoff

Kleinhans

Ruessink

et al. 2020

Earth Surf Processes Landf

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Ebb‐tidal deltas are highly dynamic environments affected by both waves and currents that approach the coast under various angles. Among other bedforms of various scales, these hydrodynamics create small‐scale bedforms (ripples), which increase the bed roughness and will therefore affect hydrodynamics and sediment transport. In morphodynamic models, sediment transport predictions depend on the roughness height, but the accuracy of these predictors has not been tested for field conditions with strongly mixed (wave–current dominated) forcing. In this study, small‐scale bedforms were observed in the field with a 3D Profiling Sonar at five locations on the Ameland ebb‐tidal delta, the Netherlands. Hydrodynamic conditions ranged from wave dominated to current dominated, but were mixed most of the time. Small‐scale ripples were found on all studied parts of the delta, superimposed on megaripples. Even though a large range of hydrodynamic conditions was encountered, the spatio‐temporal variations in small‐scale ripple dimensions were relatively small (height η≈ 0.015 m, length λ≈ 0.11 m). Also, the ripples were always highly three‐dimensional. These small dimensions are probably caused by the fact that the bed consists of relatively fine sediment. Five bedform height predictors were tested, but they all overestimated the ripple heights, partly because they were not created for small grain sizes. Furthermore, the predictors all have a strong dependence on wave‐ and current‐related velocities, whereas the ripple heights measured here were only related to the near‐bed orbital velocity. Therefore, ripple heights and lengths in wave–current‐dominated, fine‐grained coastal areas ( D50<0.25 mm) may be best estimated by constant values rather than values dependent on the hydrodynamics. In the case of the Ameland ebb‐tidal delta, these values were found to be η=0.015 m and λ=0.11 m. ©2019 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.

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“…Across the entire ebb‐tidal delta, the mean grain size (

D 50

) is 0.211 mm, with a standard deviation of 0.03 mm and a mud content (

<

0.063 mm) of 1% by volume (Pearson et al. ).…”

Section: Methodsmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 98%

Spatio‐temporal characteristics of small‐scale wave–current ripples on the Ameland ebb‐tidal delta

Brakenhoff

Kleinhans

Ruessink

et al. 2020

Earth Surf Processes Landf

View full text Add to dashboard Cite

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“…storms), and also to calmer conditions near low water slack (Figure 7). Pearson et al (2019) attribute these differences to locally resuspended fine sand (d 50 210µm) or flocculated fine sediment and organic particles advected from the Wadden Sea.…”

Section: Suspended Sedimentmentioning

confidence: 99%

Measurements of Hydrodynamics, Sediment, Morphology and Benthos on Ameland Ebb-Tidal Delta and Lower Shoreface

Prooijen¹,

Tissier²,

Wit³

et al. 2020

Preprint

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Abstract. A large-scale ﬁeld campaign has been carried out on the ebb-tidal delta (ETD) of Ameland Inlet, a basin of the Wadden Sea in the Netherlands, as well as on three transects along the Dutch lower shoreface. With this campaign, as part of KustGenese2.0 (Coastal Genesis 2.0) and SEAWAD, we aimed to gain new knowledge on the processes driving sediment transport and benthic species distribution in such a dynamic environment. These new insights will ultimately help the development of optimal strategies to nourish the Dutch coastal zone in order to prevent coastal erosion and keep up with sea level rise. The dataset obtained from the ﬁeld campaign consists of: (i) bathymetry data from single beam and multibeam measurements; (ii) ﬂow, waves, sediment concentration, conductivity and temperature, and bedforms at 10 locations on the delta; 7 stand-alone pressure sensors deployed on the ebb-tidal shoal; and 6 ADCPs on the watersheds; (iii) bed composition and macro benthic species from 166 (in 2017), 53 (in 2018) boxcores, 21 vibrocores; (iv) discharge measurements through the inlet; (v) X-band radar; (vi) meterological data. The combination of all these measurements at the same time makes this dataset unique and enables us to investigate the interactions between sediment transport, hydrodynamics, morphology and the benthic ecosystem in more detail. The data is publicly available at 4TU Centre for Research Data at https://doi.org/10.4121/collection:seawad (Delft University of Technology et al., 2019).

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“…The sediment concentration was slowly increased, obtaining the relation between voltage and sediment concentration. As the suspended sediment in the field also contained fine sediments, the results from the laboratory (containing sand) cannot be translated directly into a mass concentration (Pearson et al, 2019). Therefore, only the raw voltage output is provided.…”

Section: Framesmentioning

confidence: 99%

“…7). Pearson et al (2019) attribute these dif- Figure 7. Turbidity measured at AZG Frame 4 (8 m depth) on the ebb-tidal delta using the YSI multiparameter turbidity probe, located 1.3 m above the seabed.…”

Section: Suspended Sedimentmentioning

confidence: 99%

Measurements of hydrodynamics, sediment, morphology and benthos on Ameland ebb-tidal delta and lower shoreface

Prooijen

Tissier

Wit

et al. 2020

Earth Syst. Sci. Data

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Abstract. A large-scale field campaign was carried out on the ebb-tidal delta (ETD) of Ameland Inlet, a basin of the Wadden Sea in the Netherlands, as well as on three transects along the Dutch lower shoreface. The data have been obtained over the years 2017–2018. The most intensive campaign at the ETD of Ameland Inlet was in September 2017. With this campaign, as part of KustGenese2.0 (Coastal Genesis 2.0) and SEAWAD, we aim to gain new knowledge on the processes driving sediment transport and benthic species distribution in such a dynamic environment. These new insights will ultimately help the development of optimal strategies to nourish the Dutch coastal zone in order to prevent coastal erosion and keep up with sea level rise. The dataset obtained from the field campaign consists of (i) single- and multi-beam bathymetry; (ii) pressure, water velocity, wave statistics, turbidity, conductivity, temperature, and bedform morphology on the shoal; (iii) pressure and velocity at six back-barrier locations; (iv) bed composition and macrobenthic species from box cores and vibrocores; (v) discharge measurements through the inlet; (vi) depth and velocity from X-band radar; and (vii) meteorological data. The combination of all these measurements at the same time makes this dataset unique and enables us to investigate the interactions between sediment transport, hydrodynamics, morphology and the benthic ecosystem in more detail. The data provide opportunities to calibrate numerical models to a high level of detail. Furthermore, the open-source datasets can be used for system comparison studies. The data are publicly available at 4TU Centre for Research Data at https://doi.org/10.4121/collection:seawad (Delft University of Technology et al., 2019) and https://doi.org/10.4121/collection:kustgenese2 (Rijkswaterstaat and Deltares, 2019). The datasets are published in netCDF format and follow conventions for CF (Climate and Forecast) metadata. The http://data.4tu.nl (last access: 11 November 2020) site provides keyword searching options and maps with the geographical position of the data.

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Observations of Suspended Particle Size Distribution on an Energetic Ebb-Tidal Delta

Cited by 6 publications

References 9 publications

Spatio‐temporal characteristics of small‐scale wave–current ripples on the Ameland ebb‐tidal delta

Spatio‐temporal characteristics of small‐scale wave–current ripples on the Ameland ebb‐tidal delta

Measurements of Hydrodynamics, Sediment, Morphology and Benthos on Ameland Ebb-Tidal Delta and Lower Shoreface

Measurements of hydrodynamics, sediment, morphology and benthos on Ameland ebb-tidal delta and lower shoreface

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