Non-Hydrostatic Wave Modeling in Partly Sheltered Harbor Basins

Vledder, G.P. Van; Zijlema, Marcel

doi:10.9753/icce.v34.waves.11

Cited by 4 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of grid points per wavelength was at least 45. This is a finer resolution than in van Vledder and Zijlema (2014) who used 25 grid points per wavelength resulting in good agreement with theory in SWASH for diffraction at a semi-infinite breakwater.…”

Section: Calibration and Validationmentioning

confidence: 56%

Numerical modelling of landslide-tsunami propagation in a wide range of idealised water body geometries

Ruffini

Heller

Briganti

2019

Coastal Engineering

View full text Add to dashboard Cite

Large landslide-tsunamis are caused by mass movements such as landslides or rock falls impacting into a water body. Research of these phenomena is essentially based on the two idealised water body geometries (i) wave flume (2D, laterally confined wave propagation) and (ii) wave basin (3D, unconfined wave propagation). The wave height in 2D and 3D differs by over one order of magnitude in the far field. Further, the wave characteristics in intermediate geometries are currently not well understood. This article focuses on numerical landslide-tsunami propagation in the far field to quantify the effect of the water body geometry. The hydrodynamic numerical model SWASH, based on the non-hydrostatic non-linear shallow water equations, was used to simulate approximate linear, Stokes, cnoidal and solitary waves in 6 different idealised water body geometries. This includes 2D, 3D as well as intermediate geometries consisting of "channels" with diverging side walls. The wavefront length was found to be an excellent parameter to correlate the wave decay along the slide axis in all these geometries in agreement with Green's law and with diffraction theory in 3D. Semi-theoretical equations to predict the wave magnitude of the idealised waves at any desired point of the water bodies are also presented. Further, simulations of experimental landslide-tsunami time series were performed in 2D to quantify the effect of frequency dispersion. This process may be negligible for solitary-and cnoidal-like waves for initial landslide-tsunami hazard assessment but becomes more important for Stokes-like waves in deeper water. The findings herein significantly improve the reliability of initial landslide-tsunami hazard assessment in water body geometries between 2D and 3D, as demonstrated with the 2014 landslide-tsunami event in Lake Askja.

show abstract

Section: Calibration and Validationmentioning

confidence: 56%

Numerical modelling of landslide-tsunami propagation in a wide range of idealised water body geometries

Ruffini

Heller

Briganti

2019

Coastal Engineering

View full text Add to dashboard Cite

show abstract

“…Nowadays, also three-dimensional non-hydrostatic wave models are applied more-andmore (e.g. Zijlema et al , 2011;Van Vledder and Zijlema, 2014).…”

Section: Numerical Modelling Of a Navigation Channelmentioning

confidence: 99%

Impact of Harbor Navigation Channels on Waves: A Numerical Modelling Guideline

Dusseljee¹,

Klopman²,

Vledder

et al. 2014

Int. Conf. Coastal. Eng.

View full text Add to dashboard Cite

This study presents an intercomparison of a SWAN and SWASH wave model and 3D laboratory experiments for an existing navigation channel towards a harbor. Results show that the spectral refraction model SWAN underestimates the wave conditions in the channel and at the lee side of the channel especially -for longer waves travelling under a small angle with the channel -due to the neglect of the effects of wave tunneling by diffraction and evanescent modes. The phase-resolving non-hydrostatic 3D model SWASH does include these effects and performs reasonably well, though computational CPU demands are much higher. A modelling guideline is presented for application to other situations, showing that these effects need to be taken into account in optimizing the (layout) of the harbor; otherwise it may lead to under-or overestimation of the wave conditions and wave penetration into a harbor basin.

show abstract

“…The number of grid points per wavelength is set to at least 45. This is a finer resolution than in van Vledder and Zijlema (2014) who used 25 grid points per wavelength resulting in good agreement with theory in SWASH for diffraction at a semi-infinite breakwater. In addition, a higher order discretisation scheme, compared to the default scheme in SWASH, has been used to Stokes waves.…”

Section: Calibrationmentioning

confidence: 56%

Numerical Investigation of Landslide-Tsunami Propagation Andtransformation in a Wide Spectrum of Water Body Geometries

Ruffini¹,

Heller²,

Briganti³

2019

38th IAHR World Congress - "Water: Connecting the World"

View full text Add to dashboard Cite

Large landslide-tsunamis are caused by mass movements such as landslides and rock falls impacting into a water body. Landslide-tsunami research is essentially based on the two idealised water body geometries (i) wave flume (2D, laterally confined wave propagation) and (ii) wave basin (3D, unconfined wave propagation). The wave heights in 2D and 3D vary by over one order of magnitude in the far field and the wave characteristics in intermediate geometries are currently not well understood. This article focuses on numerical landslidetsunami propagation in the far field to quantify the effect of the water body geometry. The wave model SWASH, based on the non-hydrostatic non-linear shallow water equations, is used to simulate Stokes and solitary waves in 6 different idealised water body geometries. This includes 2D, 3D as well as intermediate geometries consisting of "channels" with diverging side walls. The wavefront length was found to be an excellent parameter to correlate the wave decay along the slide axis in all these geometries in agreement with Green's law. Semitheoretical equations to predict the wave magnitude of the idealised waves in any desired point of the water bodies are also presented. The findings herein significantly improve the reliability of preliminary landslidetsunami hazard assessment in water body geometries between 2D and 3D, as demonstrated with the application on the 2014 landslide-tsunami event in Lake Askja.

show abstract

Non-Hydrostatic Wave Modeling in Partly Sheltered Harbor Basins

Cited by 4 publications

References 13 publications

Numerical modelling of landslide-tsunami propagation in a wide range of idealised water body geometries

Numerical modelling of landslide-tsunami propagation in a wide range of idealised water body geometries

Impact of Harbor Navigation Channels on Waves: A Numerical Modelling Guideline

Numerical Investigation of Landslide-Tsunami Propagation Andtransformation in a Wide Spectrum of Water Body Geometries

Contact Info

Product

Resources

About