Approaches to long-term modelling of coastal morphology: A review

Vriend, H.J. de; Capobianco, Michele; Chesher, T.J.; Swart, H.E. de; Latteux, B.; Stive, M.J.F.

doi:10.1016/0378-3839(93)90051-9

Cited by 253 publications

(106 citation statements)

References 21 publications

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“…This highly non-linear system will lead to diffusion if the effect of bed-slope variations in time is not taken into account (Watanabe, 1988;de Vriend et al, 1993a, b. In the morphological model, the linear stability analysis of bed-level and quasi-steady conditions for waves and currents are assumed. The waves and currents are assumed to remain unchanged during the entire calculation period, while the bathymetry does vary.…”

Section: Feedback By Bed-slope Updating Schemementioning

confidence: 99%

“…This inconsistency implies that some quantities related to bed level, such as the friction factor and the sediment transport direction factor will also change. In order to modify sediment transport with bed form slope, the down slope gravitational transport rate is the most commonly utilized while the bed-level changes are greater than a threshold value (Watanabe 1988;Maruyama and Takagi, 1988;de Vriend et a., 1993a, and b;Cayocca 2001;Anunes do Carmo and Seabra-Santos, 2002 …”

Section: Feedback By Bed-slope Updating Schemementioning

confidence: 99%

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Coastal Morphological Modeling

Chiang¹,

Hsiao²

2011

Sediment Transport in Aquatic Environments

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The coastal zone is the area where the action of waves and wave-driven-currents on the seabed is very intense, and where the bed level and sediment are almost always in motion. If the mainly seasonal climate changes, the wind and wave conditions will also change. A new waves and wave-driven-currents conditions will change the rate of sediment transport and the beach topography. Natural beaches are significant characterized by an annual cycle of seasonal erosion and accretion. In other words, natural beaches are generally in dynamic equilibrium from the balance of sediment transport budge for specific area on the beach. We can utilize the conservation law of sediment transport to describe the coastal morphodynamic evolution. It is the same way to predict beach evolution due to changes in wave conditions or caused by coastal structures. Therefore, we can utilize numerical models to predict the change of bottom topography from the spatial distribution of the alongshore and offshore sediment transport rates in real coastal area. Coastal morphological models are indispensable and powerful tools that allow harbour and hydraulic engineers to predict nearshore topography, to analyze the impact of coastal structures, and to verify the planning and design of harbours and coastal defences. Morphological models are based on various sub-models for waves, tidal currents, nearshore currents, and sediment transport, coupled with the sediment transport model. The sediment transport model solves the sediment conservation equation to calculate bed-level evolution. The local sediment transport is first calculated by wave and current sub-models, and the bed form evolution is then computed based on the conservation of sediment and its continual redistribution in time. The aim of this chapter is to describe the theories, techniques, applications and robust algorithms for computing bed level change which is flexible enough to handle the nonlinearity present in the sediment conservation equations describing bed evolution in a complex coastal area. Classification of prediction methods for morphological evolutionThe changes of coastal topography were the complex and irreversible morphodynamic processes, influenced by local bathymetry, weather, wave, tide, and coastal structures, etc. The technology of prediction morphological evolution caused by coastal structures or varied with monsoon, typhoon, and climate changes, etc. is needed. In order to predict morphological evolutions, the experience analysis with many survey data in similar cases and the results of hydraulic model tests are considered in the past.

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Section: Feedback By Bed-slope Updating Schemementioning

confidence: 99%

Section: Feedback By Bed-slope Updating Schemementioning

confidence: 99%

Coastal Morphological Modeling

Chiang¹,

Hsiao²

2011

Sediment Transport in Aquatic Environments

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“…De Vriend et al (1993) and Latteux (1995) described reduction techniques and selection of representative conditions respectively to investigate long-term morphodynamics. More recently, Lesser et al (2004) and Roelvink (2006) have recommended modelling of long-term evolution by bed level updating at each hydrodynamic time step (i.e.…”

Section: Can a Process-based Approach Be Reliably Applied On The Decamentioning

confidence: 99%

Modelling Morphological Response of Large Tidal Inlet Systems to Sea Level Rise

Dissanayake¹

2011

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“…A process-based model describes the relevant physical processes starting from first physical principles (conservation laws), where necessary combined with empirical closure submodels (e.g. De Vriend et al 1993). Dou et al (1999) present a total sediment transport model for the Yangtze Estuary and hindcast the bathymetry change under a typhoon condition with it.…”

Section: Introductionmentioning

confidence: 99%

A Process-Based Approach to Sediment Transport

Chu

Wang

Vriend

et al. 2011

Int. Conf. Coastal. Eng.

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A process-based model for the Yangtze Estuary is constructed to study the sediment transport in the estuary. The proposed model covers the entire tidal region of the estuary, the Hangzhou Bay and a large part of the adjacent sea. The dominant processes, fluvial and tidal, are included in the model. The calibration of the model against extensive flow, water level, salinity and suspended sediment data shows a good representation of observed phenomena. With the present calibrated and validated model, the residual flow field and the residual sediment transport field are obtained. The residual sediment transport pattern gives insight into the morphological behaviour of the mouth bars.

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Approaches to long-term modelling of coastal morphology: A review

Cited by 253 publications

References 21 publications

Coastal Morphological Modeling

Coastal Morphological Modeling

Modelling Morphological Response of Large Tidal Inlet Systems to Sea Level Rise

A Process-Based Approach to Sediment Transport

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