Modeling bed-load transport of coarse sediments in the Great Bay Estuary, New Hampshire

Bilgili, Ata; Swift, Michael; Lynch, Daniel R.; Ip, J.T.C.

doi:10.1016/j.ecss.2003.07.007

Cited by 14 publications

(10 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, they are based upon a bed load transport rate not suitable for a Lagrangian description. Consequently, the approach by Bilgili et al [6] has been adopted, which can be directly used in a Lagrangian framework. In this approach, the critical flow velocity defining when the sediment movement starts is:…”

Section: Bed Loadmentioning

confidence: 99%

“…Instead of using a characteristic depth, this has been replaced by the local water depth, thus h = H(x, y) , since water depths change in more than one order of magnitude over the model domain. Above the critical velocity, particles are assumed to travel at one-sixth of the depth-averaged current [6]. If the current decreases below V cri the particle stops its movement.…”

Section: Bed Loadmentioning

confidence: 99%

See 1 more Smart Citation

An exploratory modelling study on sediment transport during the Zanclean flood of the Mediterranean

et al. 2019

View full text Add to dashboard Cite

A nearly 400-km-long erosion channel through the Strait of Gibraltar has been interpreted as evidence for a catastrophic refill of the Mediterranean at the end of the Messinian salinity crisis, 5.33 million years ago. This channel extends from the Gulf of Cadiz to the Algerian Basin and implies the excavation of ca. 1000 km 3 of Miocene sediment from the Alboran Basin and bedrock from the Strait of Gibraltar. The fate of these eroded materials remains unknown. In a first attempt to predict the distribution of those flood deposits, we develop a numerical model to simulate the transport of material eroded from the Strait of Gibraltar. It is a Lagrangian model based upon standard sediment transport equations which is able to simulate suspended and bed load sediment transport. Water circulation during the flood was obtained from a hydrodynamic model of the whole Mediterranean Sea previously developed by the authors and applied to the Zanclean flood. Five particle sizes were considered for suspended load and three for bed load transport. Areas of sediment deposition in the Mediterranean Sea were determined. In the case of suspended load, these are related to hydrodynamic conditions: areas sheltered from the jet of incoming water by local topography and areas where water currents abruptly decrease due to a sudden increase in water depth. In the case of bed load transport, sediments follow water streamlines and deposits are much more localized than in the case of suspended load. Single channel seismic records were also analysed to identify and characterize flood-related deposits in the eastern Alboran Sea.

show abstract

Section: Bed Loadmentioning

confidence: 99%

Section: Bed Loadmentioning

confidence: 99%

An exploratory modelling study on sediment transport during the Zanclean flood of the Mediterranean

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In this context, the jump length is the distance that the saltating particle travels over a specific length of time. The speed of a particle undergoing bedload transport has been estimated between 1/4 and 1/7 of the depth-averaged flow velocity (Bilgili et al 2003;Bogardi 1974). A more rigorously derived formula by Niño and García (1998) is based on experimental and numerical analyses that relate the dimensionless streamwise particle velocity, u s , to the dimensionless bed shear, τ * .…”

Section: Jump Lengthmentioning

confidence: 99%

Modeling Bedload Transport of Juvenile Bivalves: Predicted Changes in Distribution and Scale of Postlarval Dispersal

Hunt

Fugate

Chant

2009

Estuaries and Coasts

View full text Add to dashboard Cite

The potential consequences of bedload transport of postlarvae for patterns of distribution of marine invertebrates were explored by developing a bedload transport model for juvenile bivalves in a small estuary in New Jersey, USA. A simple numerical model of tidal current hydrodynamics was developed based on field measurements of shear stresses near the bottom. Burrowing behavior of bivalves was incorporated into the model of bedload transport by using estimates of entrainment rates of Gemma gemma and Mya arenaria in a laboratory flume, and jump lengths of the bivalves were estimated by methods previously developed for noncohesive particles. Based on the flood domination and strong gradient of shear stresses in the Navesink estuary, our model predicted that juvenile bivalves would accumulate in the center of the estuary, traveling up to several kilometers over 30 days. Field distributions of juvenile bivalves were consistent with the model predictions for other species of bivalves but not for G. gemma, for which field distributions of both <500-and >500-μm individuals were concentrated in the eastern end of the estuary. Differences between the bedload model and G. gemma distributions suggest that spatial variation in burrowing behavior or biological interactions are playing an important role in maintaining distribution patterns of this species in spite of high levels of bedload transport. This modeling approach is applicable to other juvenile benthic invertebrates that disperse as bedload and is a useful model against which to compare field observations of rates of transport and patterns of distribution and abundance.

show abstract

“…This is necessary due to the fact that the hydrodynamics in the main channel and other non-drying areas are directly affected by the water storage on drying basins. The model is discussed extensively and is proven to be numerically robust and to successfully reproduce tidal constituents and morphological features in the Great Bay Estuary, New Hampshire in: (Ip et al 1998;Inoue and Wiseman 2000;Erturk et al 2002;Thompson et al 2002;Bilgili et al 2003b;McLaughlin et al 2003).…”

Section: Model Descriptionmentioning

confidence: 99%

Estimation of Residence Time in a Shallow Back Barrier Lagoon, Hog Island Bay, Virginia, USA

Fugate

Friedrichs

Bilgili

2006

Estuarine and Coastal Modeling (2005)

View full text Add to dashboard Cite

Hog Island Bay, Virginia, is a shallow back barrier lagoon that is subject to seasonal inputs of inorganic nitrogen and related episodes of hypoxia. Numerical simulations were carried out to estimate the importance of physical flushing times relative to biochemical turnover times known to be a few days or less within the system. A 2D vertically averaged finite element hydrodynamic model, which was designed to accommodate regular flooding and dewatering of shallow flats and marshes, was coupled with a particle tracking model to estimate median lagoon residence time and the spatial distribution of local residence time in the lagoon. The model was forced with observed tidal elevations and winds from the end of the growing season when hypoxia tends to occur. The median residence time estimated by numerical modeling is on the order of weeks (358 hours), and variations in tidal stage, tidal range and wind produced deviations in median residence time on the order of days. Residence times near the inlets were very short, while those near the mainland were long, showing that (i) horizontal mixing in the Bay is insufficient to successfully apply integral methods to obtain residence times, and (ii) residence times near the mainland are long compared to timescales of biologically driven chemical transformations.

show abstract

Modeling bed-load transport of coarse sediments in the Great Bay Estuary, New Hampshire

Cited by 14 publications

References 20 publications

An exploratory modelling study on sediment transport during the Zanclean flood of the Mediterranean

An exploratory modelling study on sediment transport during the Zanclean flood of the Mediterranean

Modeling Bedload Transport of Juvenile Bivalves: Predicted Changes in Distribution and Scale of Postlarval Dispersal

Estimation of Residence Time in a Shallow Back Barrier Lagoon, Hog Island Bay, Virginia, USA

Contact Info

Product

Resources

About