The effect of geometry and tidal forcing on hydrodynamics and net sediment transport in semi-enclosed tidal basins

Boelens, Thomas; Schuttelaars, Henk M.; Schramkowski, George P.; Mulder, Tom De

doi:10.1007/s10236-018-1198-9

Cited by 13 publications

(9 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tide‐induced scour mechanism has implications for the response of estuaries to sea‐level rise and human influence. Sea‐level rise increases water depth and reduces friction, which will increase tidal dominance over fluvial dominance (Boelens et al., 2018; Du et al., 2018; Friedrichs & Aubrey, 1988; Savenije, 2006; Silvestri et al., 2018). Moreover, tidal amplitudes at the mouth may increase (or decrease) due to shifting amphidromic points (Idier et al., 2017; Pickering et al., 2017), which effectively increases (or decreases) tidal dominance as well.…”

Section: Discussionmentioning

confidence: 99%

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

et al. 2021

View full text Add to dashboard Cite

Estuaries and deltaic channels are dynamic environments at the transition from the river to the ocean (Figure 1). These coastal channels are of special importance for mankind in terms of transport (de Vriend et al., 2011) and ecological value (Bouma et al., 2005). The surrounding land is often densely populated (Edmonds et al., 2020), with 21 of the world's 30 largest cities being located next to estuaries (Ashworth et al., 2015).

show abstract

Section: Discussionmentioning

confidence: 99%

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The tide-induced scour mechanism has implications for the response of estuaries to sea-level rise and human influence. Sea-level rise increases water depth and reduces friction, which will increase tidal dominance over fluvial dominance (Boelens et al, 2018;Du et al, 2018;Friedrichs & Aubrey, 1988;Savenije, 2006;Silvestri et al, 2018). Moreover, tidal amplitudes at the mouth may increase (or decrease) due to shifting amphidromic points (Idier et al, 2017;Pickering et al, 2017), which effectively increases (or decreases) tidal dominance as well.…”

Section: Discussionmentioning

confidence: 99%

Large-scale scour in response to tidal dominance in estuaries

Leuven¹,

Keulen²,

Nienhuis

et al. 2021

Preprint

View full text Add to dashboard Cite

Channel beds in estuaries and deltas often exhibit a local depth maximum at a location close to the coast. There are two known causes of large-scale (i.e. >10 river widths along-channel) channel bed scours: width constriction and draw down during river discharge extremes, both creating a local flow acceleration. Here, we systematically investigate a potential third mechanism. We study the effect of tidal dominance on the equilibrium channel bed in estuaries with a 1D-morphodynamic model. In estuaries, a morphodynamic equibrium is reached when the net (seaward) transport matches the upstream supply along the entire reach. The residual (river) current and river-tide interactions create seaward transport. Herein, river-tide interactions represent the seaward advection of tide-induced suspended sediment by the river flow. Tidal asymmetry typically creates landward transport. The main reason for scour formation is the amplification of tidal flow through funnelling of tidal energy. Only for a scouring profile the drop in river induced current magnitude reduces the river-tide interaction term, so that the net sediment transport matches the upstream sediment transport. When tidal influence is relatively large, and when channel convergence is strong, a equilibrium is only obtained with a scouring profile. We propose a predictor dependent on the width convergence, quantified as SB, and on the ratio between the specific peak tidal discharge at the mouth and the specific river discharge at the landward boundary (qtide/qriver). Scours develop if (qtide/qriver)/SB exceeds 0.3. These results are independent of scale and allow the prediction of scour in estuaries under future changes.

show abstract

“…Clearly, the parametrizations concerning flow resistance, sediment trapping, and organic soil production need to be suitably adapted, given the different physiology and morphology of mangroves as compared to marsh vegetation (Phillips et al, 2017;Xie et al, 2020). Overall, despite the simplifications introduced with respect to 2-D morphodynamic models (Boelens et al, 2018;Coco et al, 2013;Hibma et al, 2003;van der Wegen & Roelvink, 2008), the present model is deemed to reproduce correctly the eco-morphodynamic evolution of the various morphological units composing small marine-dominated tidal basins, producing tidal morphologies which reasonably resemble those observed in the field.…”

Section: Model Limitationsmentioning

confidence: 99%

Intertwined Eco‐Morphodynamic Evolution of Salt Marshes and Emerging Tidal Channel Networks

Geng

D’Alpaos

Sgarabotto

et al. 2021

Water Resources Research

View full text Add to dashboard Cite

Tidal flats and salt marshes connect the land and the ocean by mediating the exchange of water, sediments, and nutrients within coastal landscapes (FitzGerald & Hughes, 2019;Mitsch & Gosselink, 2000;Zedler & Kercher, 2005). Salt marshes are typically covered by halophytic vegetation. They occupy elevations higher than mean sea level (MSL) and are periodically inundated by the tide (Allen, 2000;Friedrichs & Perry, 2001). Conversely, tidal flats lie below mean sea level and hence, are intermittently exposed during low tides (Zhou et al., 2016). They do not host halophytic vegetation, but can be covered by microbial biofilms or colonized by sea grasses, which contribute to stabilize the sediment bed (Chen et al., 2017;Yallop et al., 1994).Depending on the rate of relative sea level rise (RSLR) and sediment availability, tidal flats can evolve into salt marshes and vice versa (Fagherazzi et al., 2006;Marani et al., 2007;Zhou et al., 2016). As the elevation of the intertidal platform increases within the tidal frame, flow conditions become suitable for the settlement of vegetation seeds. The bare surface of tidal flats is thus progressively encroached by vegetation patches, and eventually a salt marsh forms, as a result of the interaction of physical and biological processes (Bouma et al., 2014;Hu et al., 2015). On the contrary, a salt marsh can experience a transition into a tidal

show abstract

The effect of geometry and tidal forcing on hydrodynamics and net sediment transport in semi-enclosed tidal basins

Cited by 13 publications

References 45 publications

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

Large‐Scale Scour in Response to Tidal Dominance in Estuaries

Large-scale scour in response to tidal dominance in estuaries

Intertwined Eco‐Morphodynamic Evolution of Salt Marshes and Emerging Tidal Channel Networks

Contact Info

Product

Resources

About