Coastal hydrodynamic and morphodynamic processes and engineering

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Introduction

This article presents an overview of the Coastal Wiki content (December 2016) on coastal hydrodynamic and morphodynamic processes, long term geomorphological change, climate impacts and coastal engineering (articles in blue). This content was initiated by the ENCORA themes 5 and 8.

The article also indicates missing topics (articles in red). Please help us fill these gaps by expanding and claiming these missing topics.

For some gaps alternative websites are indicated, in particular:


Hydrodynamics

Coastal Wiki articles

Coastal Wiki gap

  • Hydrodynamic processes and equations - introduction to the mathematical formulation of major physical processes that should be addressed in models for different types of coastal systems (sediment transport formulas are addressed in other articles)


Waves

Coastal Wiki articles

  • Waves - introduction to: short waves (types of short waves, wave breaking, wave generation, wave transformation, statistical description of wave parameters, wave climate classification according to wind climate), long waves (surf beat, harbour resonance, seiche, tsunami), infragravity waves, measurement of waves
  • Waves and currents by X-band radar - wave measurement technique


Incomplete articles

  • Wave transformation needs expansion with general introduction to propagation of random waves into shallow water, wave breaking and dissipation, breaking criteria, radiation stress, shoaling, setdown, wave breaking, roller energy, setup, sediment transport, observations, empirical formulas, models
  • Statistical description of wave parameters needs expansion on wave spectrum, Rayleigh distribution, intra-wave interaction
  • Edge waves definition should be expanded: periods incident waves, reflection, dissipation, propagation, coastally trapped waves


Coastal Wiki gaps

  • Types of ocean wave - progressive, standing, surface, internal, gravity, capillary, wind wave, swell, tide, planetary or Rossby (coriolis+horiz plane), tsunami, ship waves. Diagram of types of wave, showing the relationships between wavelength, wave frequency, forces and energy
  • Wave theory – introduction, linear wave theory, Stokes wave theory, solitary waves, Cnoidal waves, wave asymmetry and skewness
  • Wind wave generation – introduction to underlying processes, fetch, saturated wave field, wave-wave interaction, wave spectrum
  • Wave refraction, diffraction and reflection - introduction to underlying principles, morphological consequences of convergence and divergence of wave rays (shoreline orientation, accretion, erosion), morphodynamic feedback (relation with bar dynamics) and nearshore modelling
  • Wave transformation in the nearshore - introduction to propagation of random waves into shallow water, wave breaking and dissipation, breaking criteria, radiation stress, sediment transport, observations, empirical formulas
  • Wave-current interaction
  • Swash – introduction to swash characteristics, importance for sediment exchange between land and sea, uprush, downrush, in/exfiltration, infragravity swash, sediment transport, morphodynamic feedback, beach berm, modelling, practical formulas for different beach types
  • Wave runup – theory, models, wave overtopping, practical formulas
  • Tsunamis - introduction to tsunami generation, propagation, shoaling, runup, dissipation, modelling, observations, empirical formulas
  • Wave impact – lift force on structures, impact, practical formulas
  • Ship waves - wash or wake, Kelvin wave pattern, supercritical wash
  • Wave modelling - operational, coastal, computational fluid dynamics, smoothed particle hydrodynamics
  • Infragravity waves - introduction to characteristics of infragravity waves, their generation, interaction with nearshore morphology, their impact on beach accretion/erosion, some practical examples and formulas


External references Water waves Airy wave theory Cnoidal wave Wind wave)


Tides

Coastal Wiki articles


Incomplete articles

  • Tides needs revision
  • Tidal prediction needs expansion : harmonic method, tidal constituents, specific examples
  • Storm surge definition needs expansion: storm surge prediction, storm surge modelling, storm surge impact


Coastal Wiki gaps

  • Tides in the oceans
  • Tidal asymmetry – introduction to tidal topographically induced wave distortion in shallow coastal systems
  • Tidal bores- introduction to tidal wave propagation in shallow water, bore development and propagation/dissipation, bore types, relation with channel geometry and bed roughness, observations, modelling, practical formulas, implications for sediment transport


External references


Currents

Coastal Wiki articles


Incomplete articles

  • Longshore current ,
  • Rip currents definition needs expansion: introduction to characteristics of rip-cells, their importance, occurrence, hydrodynamics, morphodynamic feedbacks, influence of tides, storms, modelling, practical formulas, implications for coastal management


Coastal Wiki gaps

  • Wind driven currents – sea surface entrainment, turbulence, Ekman theory
  • Density-driven currents – buoyancy, stratification, turbulence damping, entrainment, modelling
  • Turbulence – generation, coherent flow structures, dissipation, Kolmogorov theory, spectrum, shear stress, diffusion, mixing length


Diffusion, dispersion

Coastal Wiki articles


Incomplete articles

  • Stratification – needs expansion: stability criteria, internal waves, Kelvin-Helmholz instability, turbulence damping, internal friction, mixing


Coastal Wiki gaps


External references


Flood risk

Coastal Wiki articles


Coastal Wiki gaps


Sediments and sediment transport

Coastal Wiki articles


Incomplete articles


Coastal Wiki gaps

  • Sediment classification - grain size, gravel, sand, boulder, shape, flat, round, type, cohesive, non-cohesive
  • Cross-shore sediment transport - shoaling zone, breaker zone, swash zone
  • Graded beds – sorting processes, seabed armouring, erosion, deposition, modelling
  • Sediment budget coastal systems
  • Boundary layer processes and sediment transport - introduction to the boundary layer concept (waves, current, waves+current), turbulence, temporal-spatial scales, bed-flow interaction, velocity and acceleration skewness, flat/rippled/sloping beds, sediment transport processes, onshore-offshore asymmetry, observation, modelling, practical formulas
  • Current ripples and dunes – formation processes, theoretical background, modelling
  • Wave ripples - introduction to characteristics of wave-induced ripples, conditions of occurrence, seabed instability, morphodynamic feedback processes, wavelength selection, pattern formation and evolution, initial state, defects, final state
  • Aeolian transport – from beach to dunes, influence of grainsize, fetch, tides, moisture, vegetation, dune formation, modelling


External references


Classification of coasts

Coastal Wiki articles


Incomplete articles

  • Rocky shore morphology – needs expansion to cliff morphology, sediment input, shore platforms, stacks, headlands, etc.


Coastal Wiki gaps

  • Typology coastlines – introduction to different coastline classification schemes, accretional, erosional coasts, beaches, estuaries, inlets, deltas, cliffs, mudflats, dunes, stacks, headlands, blowholes
  • Equilibrium coastal profile
  • Wave-dominated coast, barriers, beaches, breaker bars, intertidal bars and runnels
  • Tidal lagoons
  • Fluvial-dominated coast
  • Tide-dominated river deltas - introduction to characteristics of tidal deltas with high liquid and solid river discharge, major processes for their formation, evolution and maintenance, resilience and threats, response to sea-level rise
  • Macrotidal coasts - introduction to: characteristics of macrotidal coasts (compared to micro- or mesotidal coasts), variability, major involved hydrodynamic and morphodynamic processes, resilience, response to sea-level rise
  • [[Mud coasts] - introduction to the particular characteristics of mud coasts (compared to sand coasts) and the processes responsible for their formation, evolution and maintenance, threats and response to sea-level rise
  • Typology of mangrove coasts – morphological-ecological interaction


External references


Estuaries

Coastal Wiki articles


Incomplete articles

  • Estuaries and tidal rivers – introduction to different types of estuaries
  • Mudflat – needs expansion of existing definition, mudflat morphology and morphodynamics (interaction morphology-tide-waves-biology), link to saltmarsh morphology
  • Fjords – definition needs to be expanded: formation process, hydrodynamics
  • Coastal squeeze – article must be revised and expanded: introduction to the concept of coastal squeeze, influential factors, how does it happen, consequences, examples, how to avoid, how to mitigate, lessons from practice


Coastal Wiki gaps


External references


Coastal morphodynamics

Coastal Wiki articles


Incomplete articles

  • Beach berm – expand definition and add section on berm formation


Coastal Wiki gaps

  • Coastline instability - introduction to conditions for coastline instability, occurrence, characteristics of unstable coastlines, observations, processes, morphodynamic feedback, modelling, practical formulas, implications for coastal management
  • Morphodynamic selforganisation processes – principles of self-organisation and examples
  • Rhythmic shoreline features – introduction to shoreline features that can be generated by morphodynamic feedback, such as megacusps, crescentic bars, transverse bars, large-scale shoreline features, large-scale instabilities associated to the littoral drift
  • Coastal barrier formation - introduction to characteristics of coastal barriers, their importance, processes responsible for their formation, evolution and maintenance, threats to existing coastal barriers (human interventions and sea-level rise), good management practices
  • Breaker bar dynamics – development, evolution and decay of breaker bars in the surf zone, underlying morphodynamic processes and modelling
  • Coastal profile response to storms – profile steepening, breaker bar dynamics (migration, formation)
  • Shoreline planform – pocket beach equilibrium planform (see Parametric equilibrium models), shoreline rotation
  • Beach-dune interaction - introduction to major processes of coastal dune formation and erosion, and practical modelling concepts
  • Reef systems
  • Large-scale bedforms in shelf seas - introduction to the characteristics of tidal ridges and shoreface-connected ridges, conditions and (feedback)processes for their formation, evolution and maintenance, some examples and idealised models
  • Nearshore bed forms and bed roughness - introduction to the physical background and practical methods for representing the influence of bed forms and bed roughness in the nearshore zone in numerical models of waves, currents, mixing and sediment transport
  • Sand waves - introduction to characteristics of sand waves, their practical importance, conditions and major (feedback)processes for their formation, evolution and maintenance, modelling, some examples and simple rules


Coastal erosion

Coastal Wiki articles


Coastal Wiki gaps

  • Shoreline prediction – practical (data-driven) methods, applicability, storms, implication for coastal management
  • Decadal coastal prediction - introduction to (data-driven) methods for predicting coastal evolution over decadal time scale


External references


Long-term morphodynamics and climate change

Coastal Wiki articles


Incomplete articles

  • Geomorphology – needs expansion to a general article linking to more specific articles
  • Climate change - extend existing definition to general introduction to the topic


Coastal Wiki gaps


Coastal engineering


Incomplete articles

  • Dredging needs expansion with overview article of techniques and impact


Coastal Wiki gaps


External references