Quantified turbulent diffusion of suspended sediment using acoustic Doppler current profilers

Sassi, M.G.; Hoitink, A.J.F.; Vermeulen, B.

doi:10.1002/2013gl058299

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…In particular, the development of dunes in tidal rivers where the sediment characteristics transition from sand to mud needs to be better understood. New techniques for in situ monitoring [e.g., Sassi et al , , ; Vermeulen et al , , , ] can assist further exploration of the associated processes governing flow and sediment transport. Third, research on the interaction between tidal river hydrodynamics and wetland vegetation deserves priority.…”

Section: Discussionmentioning

confidence: 99%

Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

278

226

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Tidal rivers are a vital and little studied nexus between physical oceanography and hydrology.It is only in the last few decades that substantial research efforts have been focused on the interactions of river discharge with tidal waves and storm surges into regions beyond the limit of salinity intrusion, a realm that can extend inland hundreds of kilometers. One key phenomenon resulting from this interaction is the emergence of large fortnightly tides, which are forced long waves with amplitudes that may increase beyond the point where astronomical tides have become extinct. These can be larger than the linear tide itself at more landward locations, and they greatly influence tidal river water levels and wetland inundation. Exploration of the spectral redistribution and attenuation of tidal energy in rivers has led to new appreciation of a wide range of consequences for fluvial and coastal sedimentology, delta evolution, wetland conservation, and salinity intrusion under the influence of sea level rise and delta subsidence. Modern research aims at unifying traditional harmonic tidal analysis, nonparametric regression techniques, and the existing understanding of tidal hydrodynamics to better predict and model tidal river dynamics both in single-thread channels and in branching channel networks. In this context, this review summarizes results from field observations and modeling studies set in tidal river environments as diverse as the Amazon in Brazil, the Columbia, Fraser and Saint Lawrence in North America, the Yangtze and Pearl in China, and the Berau and Mahakam in Indonesia. A description of state-of-the-art methods for a comprehensive analysis of water levels, wave propagation, discharges, and inundation extent in tidal rivers is provided. Implications for lowland river deltas are also discussed in terms of sedimentary deposits, channel bifurcation, avulsion, and salinity intrusion, addressing contemporary research challenges.

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Section: Discussionmentioning

confidence: 99%

Tidal river dynamics: Implications for deltas

Hoitink

Jay

2016

Reviews of Geophysics

278

226

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“…More recently, Sassi et al . [] succeeded in obtaining turbulent sediment fluxes in the tidal river Mahakam by measuring turbulent flow and sediment quantities simultaneously in the same sampling volume. For this purpose, they used coupled acoustic Doppler current profilers (ADCPs) [see Kostaschuk et al ., ; Shugar et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes

Naqshband

Ribberink

Hurther

et al. 2014

Geophysical Research Letters

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Accurate estimation of sediment transport is critical for many fluvial processes but remains challenging due to high-frequency dynamics. Using novel acoustic flow instrumentation, we quantified the contribution of turbulent bed and suspended sediment fluxes to the total sediment fluxes along an entire dune profile and over the full flow depth. We found that over the dune stoss side and in the bed load layer, the turbulent mean streamwise flux is negative and reaches up to 40% of the total mean streamwise flux. Over the lee side, where turbulent intensities are highest, the contribution of the turbulent mean streamwise flux to the total mean streamwise flux is larger and reaches up to 50%. The mean vertical turbulent flux along the entire dune bed and in the bed load layer reaches nearly 30% of the total mean vertical flux. Turbulent sediment flux may thus constitute a large component of the total flux.

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“…Even in the Mahakam River, where concentrations are not that extraordinary high, silt grains cannot be considered a passive tracer. Measurements with acoustic Doppler current profilers showed the turbulent Prandtl-Schmidt number is often significantly different from unity [11], which invalidates a common assumption in suspended sediment models. It is not always possible to translate acoustic backscatter to suspended sediment concentration, but in cases where this is feasible, the measurement of flow and suspended sediment are exactly co-located.…”

Section: Feedbacks Between Bedforms Sediment Transport and Dischargementioning

confidence: 94%

(En)gage the flow! : striking the balance in deltas under pressure

Hoitink¹

2020

Preprint

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Quantified turbulent diffusion of suspended sediment using acoustic Doppler current profilers

Cited by 13 publications

References 26 publications

Tidal river dynamics: Implications for deltas

Tidal river dynamics: Implications for deltas

Experimental evidence for turbulent sediment flux constituting a large portion of the total sediment flux along migrating sand dunes

(En)gage the flow! : striking the balance in deltas under pressure

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