Upper Mississippi River Flow and Sediment Characteristics and Their Effect on a Harbor Siltation Case

Fernández, Roberto; García, Marcelo H.; Parker, Gary

doi:10.1061/(asce)hy.1943-7900.0001507

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…), suspended sediment concentrations (< 10 / ) and bed sediment diameter ( "# 0.420 ) used in this study are typical for many watercourses [56][57][58] . Both segregated and locked end states appear to occur with frequency in natural watercourses.…”

Section: Implications For Storage and Breakdown Of Natural And Synthetic Particulate Mattermentioning

confidence: 99%

Bedform segregation and locking increase storage of natural and synthetic particles in rivers

Dallmann¹,

Phillips²,

Teitelbaum³

et al. 2022

Preprint

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While the ecological significance of hyporheic exchange and fine particle transport in rivers is well established, these processes are generally considered irrelevant to riverbed morphodynamics. We show that coupling between hyporheic exchange, suspended sediment deposition, and sand bedform motion strongly modulates morphodynamics and sorts bed sediments. Hyporheic exchange focuses fine-particle deposition within and below mobile bedforms, which suppresses bed mobility. However, deposited fines are also remobilized by bedform motion, providing a mechanism for segregating coarse and fine particles in the bed. Surprisingly, two distinct end states emerge from the competing interplay of bed stabilization and remobilization: a locked state in which fine particle deposition completely stabilizes the bed, and a dynamic equilibrium in which frequent remobilization sorts the bed and restores mobility. These findings demonstrate the significance of hyporheic exchange to riverbed morphodynamics and clarify how dynamic interactions between coarse and fine particles produce sedimentary patterns commonly found in rivers

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Section: Implications For Storage and Breakdown Of Natural And Synthetic Particulate Mattermentioning

confidence: 99%

Bedform segregation and locking increase storage of natural and synthetic particles in rivers

Dallmann¹,

Phillips²,

Teitelbaum³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…(1966), as shown in Figure . Also shown in Section S1 is the lognormal fit to the GSDs of sediment in three rivers, including the sand‐bed Mississippi River at St. Louis (Fernández et al., 2018; Naito et al., 2019), sand‐bed Yangtze River at Datong (Ma et al., 2017; Yu & Lu, 2005), and Colorado River at Lees Ferry (Walling & Moorehead, 1989). Results show that the lognormal distribution provides an approximate fit to both the bed surface and bed material load (>62 μm) in these cases.…”

Section: Grain Size‐specific Engelund‐hansen Type Relation For Sand‐bmentioning

confidence: 99%

Grain Size‐Specific Engelund‐Hansen Type Relation for Bed Material Load in Sand‐Bed Rivers, With Application to the Mississippi River

Gong

Naito

et al. 2021

Water Resources Research

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Many sand‐bed rivers worldwide have been experiencing significant reductions in sediment load over the past several decades. This is one of the causes of river delta drowning worldwide. This problem, however, has not been studied in detail in the context of sediment grain sorting. Considering the good performance of the original Engelund‐Hansen relation (OEH) for uniform sediment, and the fact that bulk grain size‐specific relations for bed material load that allow for sorting are relatively rare in the case of sand‐bed rivers, a grain size‐specific Engelund‐Hansen type relation (SEH) is proposed in this study based on data from a large flume. We embed both the OEH and the SEH in a one‐dimensional river morphodynamic model to simulate the morphodynamic evolution of the middle Mississippi River in response to the upstream cutoff of sediment supply. Simulation results using a single characteristic grain size show that bed material load delivered to the delta reduces only gradually in response to the cutoff of sediment supply, in agreement with previous studies. However, implementing the full grain size distribution of sediment leads to a much faster reduction of bed material load delivered to the delta, because the bed surface coarsens in response to grain sorting. This armoring inhibits the bed degradation that would replenish sediment load along the channel. The bed material load of finer sediment declines more rapidly than that of coarser sediment. The results of this study have practical implications for river delta restoration.

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“…4) were simulated. The bed-forming discharge (also known as effective discharge [54]) is the flow rate that statistically transports the higher bed load rate considering the water level frequently. Multiplying the water level frequency curve (left Figure in Fig.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

A Novel Sediment Transport Calculation Method-Based 3D CFD Model Investigation of a Critical Danube Reach

Török

Józsa

Baranya

2020

Pol. J. Environ. Stud.

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Many studies describe in detail that important bed changes were detectable in the river bed of the Upper Hungarian Danube in the last decades [1,2].The installation of the Gabcikovo hydropower plant in the upstream [3-5], other artificial interventions (e.g., groin fields, ripraps) and a significant volume of dredging [1,6] upset the balance in the sediment and morphodynamic system. The altered morphodynamic processes led to remarkable bed changes [1,[6][7][8]. During 2-3 decades, bed incision to a few meters of magnitude was detected and ascertained as the main

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Upper Mississippi River Flow and Sediment Characteristics and Their Effect on a Harbor Siltation Case

Cited by 8 publications

References 24 publications

Bedform segregation and locking increase storage of natural and synthetic particles in rivers

Bedform segregation and locking increase storage of natural and synthetic particles in rivers

Grain Size‐Specific Engelund‐Hansen Type Relation for Bed Material Load in Sand‐Bed Rivers, With Application to the Mississippi River

A Novel Sediment Transport Calculation Method-Based 3D CFD Model Investigation of a Critical Danube Reach

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