2013
DOI: 10.1002/wrcr.20216
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Sediment discharge division at two tidally influenced river bifurcations

Abstract: [1] We characterize and quantify the sediment discharge division at two tidally influenced river bifurcations in response to mean flow and secondary circulation by employing a boatmounted acoustic Doppler current profiler (ADCP), to survey transects at bifurcating branches during a semidiurnal tidal cycle. The ADCP collecting flow velocity and acoustical backscatter data was used to quantify suspended sediment discharge, adopting a recently introduced calibration procedure. Measured profiles of flow velocity a… Show more

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Cited by 39 publications
(32 citation statements)
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“…As the bulk of sediment is transported in suspension, we do not directly measure the bedload. The suspended load dominance under similar conditions has been shown by measurements in the Mahakam River (Sassi et al., ). Appendix A gives an estimate of the bedload to suspended load ratio.…”
Section: Methodssupporting
confidence: 79%
See 1 more Smart Citation
“…As the bulk of sediment is transported in suspension, we do not directly measure the bedload. The suspended load dominance under similar conditions has been shown by measurements in the Mahakam River (Sassi et al., ). Appendix A gives an estimate of the bedload to suspended load ratio.…”
Section: Methodssupporting
confidence: 79%
“…Tides may stabilize river bifurcations, as deltas under mixed influence of river and tidal flow typically have more channels than fluvially dominated deltas. Tides influence sediment transport, channel geometry, and the division of river discharge (Buschman et al., ; Redolfi et al., ; Sassi et al., , ). The mechanism by which tides stabilize deltaic river bifurcations is not fully understood.…”
Section: Introductionmentioning
confidence: 99%
“…Given the economic, engineering, and geological significance of deltaic distributaries, considerable effort has been devoted to identifying the parameters that influence morphological stability at bifurcations. These include the width ratio of the two downstream branches (Bolla Pittaluga et al, ; Edmonds & Slingerland, ; Kleinhans et al, ), a gradient advantage making one bifurcate the preferential flow route (Marra et al, ), climate‐driven changes in basinwide discharge (Edmonds et al, ), and secondary flow structures produced by meanders or bedforms upstream of the bifurcation (Kleinhans et al, ; Miori et al, ; Sassi et al, ). Tidal energy further influences bifurcation behavior by inhibiting sediment deposition in non‐dominant distributaries (Kästner et al, ), modulating discharge partitioning among the downstream branches (Buschman et al, ; Sassi et al, ; Zhang et al, ), and introducing baroclinically driven circulation between the bifurcates if the system is poorly mixed (Buschman et al, ; Kim & Voulgaris, ; Shaha & Cho, ).…”
Section: Discussionmentioning
confidence: 99%
“…The relevant literature on this type of system includes several recent publications which characterize tidal hydrodynamics in smaller tidal delta plain environments with interconnected channels, including the ∼500 km 2 Berau (Buschman et al, , ) and ∼1,500 km 2 Mahakam Delta (Sassi et al, , ). These results provide a conceptual framework for understanding how mass and energy propagate through looping, interconnected systems.…”
Section: Introductionmentioning
confidence: 99%
“…Tidal mechanisms are also key processes in sediment transport in estuaries (e.g. Allen et al, 1980;Dyer, 1986;Dronkers, 1986;Sassi et al, 2013). In the middle and lower estuaries, deposition is mainly driven by the dynamics of the turbidity maximum zone, whose presence and dynamics are governed by the coupling between river discharge and tidal propagation (e.g.…”
Section: Tide and Tidal Influence In The Estuariesmentioning
confidence: 99%