Experimental study of cohesive sediment consolidation and resuspension identifies approaches for coastal restoration: Lake Lery, Louisiana

Lo, Edward; Bentley, Samuel J.; Xu, Kehui

doi:10.1007/s00367-014-0381-3

Cited by 25 publications

(14 citation statements)

References 34 publications

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“…The analysis reveals that bed sediment is comprised mostly of silt and clay with a D50 of approximately 10 microns, and it is consistent with other regional studies that these particles are carried in suspension as flocs (Lo et al 2014). Kolmogorov micro-scale estimates indicate the water column can sustain flocs on the order of 600-1,000 microns at St1, St2, and St4, and potentially larger flocs at St3.…”

Section: Sediment Dynamicssupporting

confidence: 89%

Sediment dynamics in a vegetated tidally influenced interdistributary island : Wax Lake, Louisiana

Styles¹,

Bryant²,

Gailani³

et al. 2017

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River deltas are maintained by a continuous supply of terrestrial sediments that provide critical land-building material to help sustain and protect coastal communities. In order to examine the mechanisms of sediment delivery, a field study was conducted at Wax Lake Delta located in St. Mary Parish, LA. Instrumented platforms equipped with wave, current, tide and sediment sensors were installed on Mike Island, an interdistributary island located near the centerline axis of the delta complex. This report focuses on the hydrodynamic measurements, which imply multiple regimes of sediment delivery based on seasonal differences in climate and biological activity. In winter, vegetation is absent, and the primary flow is driven by tides. In the spring, increased river discharge inundates the island producing lateral flows and increase in suspended sediment concentrations that supply large quantities of terrestrial sediments to interior regions. In late spring, persistent southeasterly winds create setup along the coast and higher water levels over the island allowing waves to more easily penetrate the island interior. The emergence of American lotus (Nelumbo lutea) in summer forms a dense canopy over the island reducing wave and current energy, increasing the potential for sediment deposition.

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Section: Sediment Dynamicssupporting

confidence: 89%

Sediment dynamics in a vegetated tidally influenced interdistributary island : Wax Lake, Louisiana

Styles¹,

Bryant²,

Gailani³

et al. 2017

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“…10.1029/2020JC016146 10 of 16 indicate fine-grained suspended material is transported as cohesive flocs (Lo et al, 2014). Floc formation and sustainability is controlled by the mechanical shearing force as measured by G (Equation 5).…”

Section: Sediment Dynamicsmentioning

confidence: 99%

Seasonal Controls on Sediment Delivery and Hydrodynamics in a Vegetated Tidally Influenced Interdistributary Island

et al. 2021

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River deltas are among the world's most imperiled landscapes. Their low elevations, combined with their typically low elevation gradients, make them particularly vulnerable to changes in sediment supply, eustatic sea-level rise (Cazenave & Llovel, 2010) and subsidence (Erickson, 2006), as their sustainability largely hinges on the relative balance between these factors (Syvitski, 2008). With over 500 million people

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“…The GEMS system was composed of a laptop, a power control box, two turbidimeters, a pump controller, two rotating motors, two erosional heads, two sediment chambers, source water, collection bottles, and a suction filtration system. An illustration and a picture of the GEMS system can be found in Lo et al [25] and Xu et al [18], respectively. Sediment was eroded from the core top by applying a shear stress via a magnetically-coupled rotational head.…”

Section: Field Measurement Of Erodibilitymentioning

confidence: 99%

“…For comparison with GEMS results, Lo et al [25] calculated wave-induced shear stress in a variety of wind speed, fetch and depth conditions for coastal bays. Here fetch is defined as the distance over water that the winds blow in the same direction.…”

Section: Wave and Shear Stress Calculationmentioning

confidence: 99%

“…Xu et al [18] and Mickey et al [24] collected a total of 106 sediment cores on Louisiana shelf and quantified critical shear stress and eroded mass based on field experiments in early spring and late summer seasons. Lo et al [25] collected sediment from Lake Lery which is downstream of Big Mar that receives discharge from Caernarvon freshwater diversion (Figure 1), and did ex-situ sediment erodibility experiments in a lab to quantify the erodibility changes one, two and four weeks after initial settling. However, there is currently a paucity of data of field measurement of sediment erodibility in Louisiana estuaries and bays.…”

Section: Introductionmentioning

confidence: 99%

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Implications of Texture and Erodibility for Sediment Retention in Receiving Basins of Coastal Louisiana Diversions

Bentley

Robichaux

et al. 2016

Water

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Abstract:Although the Mississippi River deltaic plain has been the subject of abundant research over recent decades, there is a paucity of data concerning field measurement of sediment erodibility in Louisiana estuaries. Two contrasting receiving basins for active diversions were studied: West Bay on the western part of Mississippi River Delta and Big Mar, which is the receiving basin for the Caernarvon freshwater diversion. Push cores and water samples were collected at six stations in West Bay and six stations in Big Mar. The average erodibility of Big Mar sediment was similar to that of Louisiana shelf sediment, but was higher than that of West Bay. Critical shear stress to suspend sediment in both West Bay and Big Mar receiving basins was around 0.2 Pa. A synthesis of 1191 laser grain size data from surficial and down-core sediment reveals that silt (4-63 µm) is the largest fraction of retained sediment in receiving basins, larger than the total of sand (>63 µm) and clay (<4 µm). It is suggested that preferential delivery of fine grained sediment to more landward and protected receiving basins would enhance mud retention. In addition, small fetch sizes and fragmentation of large receiving basins are favorable for sediment retention.

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Experimental study of cohesive sediment consolidation and resuspension identifies approaches for coastal restoration: Lake Lery, Louisiana

Cited by 25 publications

References 34 publications

Sediment dynamics in a vegetated tidally influenced interdistributary island : Wax Lake, Louisiana

Sediment dynamics in a vegetated tidally influenced interdistributary island : Wax Lake, Louisiana

Seasonal Controls on Sediment Delivery and Hydrodynamics in a Vegetated Tidally Influenced Interdistributary Island

Implications of Texture and Erodibility for Sediment Retention in Receiving Basins of Coastal Louisiana Diversions

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