Flow and Drag in a Seagrass Bed

Monismith, Stephen G.; Hirsh, Heidi; Batista, Natasha; Francis, H R Franca; Egan, Galen; Dunbar, Robert B.

doi:10.1029/2018jc014862

Cited by 16 publications

(20 citation statements)

References 34 publications

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“…The drag coefficient C D is calculated using (3) (Figure 4 (a)) and it represents the total momentum loss between 279 mooring sites LT1 and LT3. The total BTPG is the dominant term that balances the drag in the momentum budget, 280 similar to other studies in the coastal regions (e.g., Lentz et al, 2017;Rogers et al, 2018;Monismith et al, 2019).…”

supporting

confidence: 73%

High and variable drag in a sinuous estuary with intermittent stratification

Bo¹,

Ralston

Kranenburg

et al. 2021

Preprint

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supporting

confidence: 73%

High and variable drag in a sinuous estuary with intermittent stratification

Bo¹,

Ralston

Kranenburg

et al. 2021

Preprint

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“…Channel curvature can also cause flow separation of the along-channel velocity at the inside of bends, which is observed at sharp channel bends in both rivers (e.g., Ferguson et al, 2003) and tidal channels (e.g., Leeder & Bridges, 1975). The bend sharpness is customarily quantified as R/w, the ratio of bend radius of curvature In addition to bottom roughness, larger scale features can increase drag on the flow including coral reefs (e.g., Kunkel et al, 2006;Lentz et al, 2017;Rogers et al, 2018), vegetation (e.g., Kadlec, 1990;Monismith et al, 2019;Nepf, 1999), and form drag from topography (e.g., S. J. Warner & MacCready, 2014).…”

Section: Sinuous Tidal Channelsmentioning

confidence: 99%

“…In addition to bottom roughness, larger scale features can increase drag on the flow including coral reefs (e.g., Kunkel et al, 2006; Lentz et al, 2017; Rogers et al, 2018), vegetation (e.g., Kadlec, 1990; Monismith et al, 2019; Nepf, 1999), and form drag from topography (e.g., S. J. Warner & MacCready, 2014). This research will characterize a type of form drag, in particular on how channel meanders can increase the effective drag at larger scales.…”

Section: Introductionmentioning

confidence: 99%

Flow Separation and Increased Drag Coefficient in Estuarine Channels With Curvature

Ralston

2020

JGR Oceans

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Flow separation has been observed and studied in sinuous laboratory channels and natural meanders, but the effects of flow separation on along-channel drag are not well understood. Motivated by observations of large drag coefficients from a shallow, sinuous estuary, we built idealized numerical models representative of that system. We found that flow separation in tidal channels with curvature can create form drag that increases the total drag to more than twice that from bottom friction alone. In the momentum budget, the pressure gradient is balanced by the combined effects of bottom friction and form drag, which is calculated directly. The effective increase in total drag coefficient depends on two geometric parameters: dimensionless water depth and bend sharpness, quantified as the bend radius of curvature to channel width ratio. We introduce a theoretical boundary layer separation model to explain this parameter dependence and to predict flow separation and the increased drag. The drag coefficient can increase by a factor of 2-7 in "sharp" and "deep" sinuous channels where flow separation is most likely. Flow separation also enhances energy dissipation due to increased velocities in bends, resulting in greater loss of tidal energy and weakened stratification. Flow separation and the associated drag increase are expected to be more common in meanders of tidal channels than rivers where point bars that inhibit flow separation are more commonly found. The increased drag due to flow separation reduces tidal amplitude and affects velocity phasing along the estuary and could result in morphological feedbacks.

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“…Efforts have been made to estimate the drag effects from reefs which have been found to be up to 10× greater than the canonical 0.0025 value for muddy or sandy sea beds (Monismith, 2007). Furthermore, Monismith et al (2019) found that the drag from seagrass beds can range from 0.05 to 1 depending on the phase of the tide.…”

Section: Sources and Effects Of Tidal Creek Dragmentioning

confidence: 99%

Flows, Transport, and Effective Drag in Intertidal Salt Marsh Creeks

et al. 2021

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Introduction Salt Marshes and Tidal CreeksSalt marshes form along temperate, low-energy coastlines worldwide where they provide valuable ecological (e.g., C-sequestration, N-cycling, and biodiversity enhancement) and economic services (e.g., fisheries and storm surge reduction) (Barbier et al., 2011;Bouma et al., 2014;Temmerman et al., 2013). These tidally flooded landforms are created via sedimentation, a process that is enhanced by vegetation (Fagherazzi et al., 2012). The feedbacks that occur between water flow, vegetation, and sedimentation allow salt marshes to adjust in vertical relief and spatial extent in response to sea-level changes and shorter timescale events-such as hurricanes, droughts, and oil spills (Coverdale et al., 2012;Fagherazzi et al., 2012;Lin & Mendelssohn, 2012). Within these biogenic coastal landforms, tidal channels and creeks bisect elevated marsh platforms, forming branched networks that control the exchange of water (

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Flow and Drag in a Seagrass Bed

Cited by 16 publications

References 34 publications

High and variable drag in a sinuous estuary with intermittent stratification

High and variable drag in a sinuous estuary with intermittent stratification

Flow Separation and Increased Drag Coefficient in Estuarine Channels With Curvature

Flows, Transport, and Effective Drag in Intertidal Salt Marsh Creeks

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