Search results for: Philip L.-F. Liu

Items from 1 to 20 out of 49 results

article

A unified coupled-mode method for wave scattering by rectangular-shaped objects

Jie Hu, Philip L-F. Liu

Applied Ocean Research > 2018 > 79 > C > 88-100

This paper presents a general solution for wave scattering by stationary objects, which consist of a submerged rectangular plate and a floating rectangular dock. These objects have the same width and their centerlines are aligned. The objects can be either permeable or solid. Within the framework of linear potential flow theory, the method of eigenfunction expansion is adopted to solve the wave scattering...

article

Modeling transient long waves propagating through a heterogeneous coastal forest of arbitrary shape

Che-Wei Chang, Philip L.-F. Liu, Chiang C. Mei, Maria Maza

Coastal Engineering > 2017 > 122 > C > 124-140

A model is proposed to study transient long waves propagating through coastal vegetation. The coastal forest is modeled by an array of rigid and vertically surface-piercing cylinders. The homogenization method, i.e. multi-scale perturbation theory, is applied to separate two contrasting physical length scales: the scale characterizing transient waves and the scale representing the diameter of and...

article

Periodic water waves through a heterogeneous coastal forest of arbitrary shape

Che-Wei Chang, Philip L.-F. Liu, Chiang C. Mei, Maria Maza

Coastal Engineering > 2017 > 122 > C > 141-157

Small-amplitude water waves propagating through a heterogeneous coastal forest of arbitrary shape is studied. Following the theoretical approach introduced by [10], the forest is modeled by an array of rigid and vertical cylinders. Assuming that the wavelength is much larger than the cylinder diameter and the cylinder spacing, a multi-scale perturbation theory of homogenization ([15]) is applied to...

article

Analytical solutions for estimating tsunami propagation speeds

Chao An, Philip L-F. Liu

Coastal Engineering > 2016 > 117 > C > 44-56

Recent studies suggest that the tsunami speed can be slowed down by around 1% due to Earth elasticity, water compressibility and density stratification. Analytical solutions of wave dispersion relationship, accounting for such effects, were found in previous studies. In this paper, we investigate the additional effects of water viscosity, ocean stratification due to temperature/salinity and numerical...

article

An integral treatment of friction during a swash uprush

Nimish Pujara, Philip L.-F. Liu, Harry Yeh

Coastal Engineering > 2016 > 114 > C > 295-300

The effects of bed friction are modelled for the flow near the moving shoreline during the uprush phase of a swash event by extending the Pohlhausen method used by Whitham (1955) to a sloping bed. The tip of the swash near the moving shoreline is treated in an integral sense as a region of uniform velocity, being acted on by the forces of friction, gravity, and the pressure force induced by the frictionless...

article

Estimating tsunami runup with fault plane parameters

Ignacio Sepúlveda, Philip L.-F. Liu

Coastal Engineering > 2016 > 112 > C > 57-68

Forecasting the maximum runup height and inundation area caused by a tsunami event has often been done by solving a numerical model describing the physical process. This approach requires data of fault plane parameters and bathymetry. The time required to prepare and execute the numerical model could be substantial. Therefore, it might not be suitable for the purpose of warning tsunami coastal flooding...

article

An experimental study of the interaction of two successive solitary waves in the swash: A strongly interacting case and a weakly interacting case

Nimish Pujara, Philip L.-F. Liu, Harry H. Yeh

Coastal Engineering > 2015 > 105 > C > 66-74

The interaction of successive solitary waves in the swash zone have been studied using large-scale experiments with a simple bathymetry of a constant depth region, where the water depth was 1.72m, and a plane beach, whose slope was 1:12. Two wave cases were considered where two successive solitary waves of the same height were generated one after the other so that the wave crests were separated by...

article

Development of a tsunami early warning system for the South China Sea

Simon C. Lin, Tso-Ren Wu, Eric Yen, Hsin-Yen Chen, more

Ocean Engineering > 2015 > 100 > C > 1-18

The Manila subduction zone is identified as one of the most hazardous tsunami source regions, and the countries around the South China Sea are under threat from tsunami hazard. However, the number of early-warning tsunami buoys being deployed in this area is far fewer than that in the Pacific Ocean. This study investigates a feasible approach for establishing a tsunami early warning system in the...

article

Periodic water waves through an aquatic forest

Philip L.-F. Liu, Che-Wei Chang, Chiang C. Mei, Pedro Lomonaco, more

Coastal Engineering > 2015 > 96 > Complete > 100-117

In this paper the semi-analytical theory of water wave propagation through vegetation developed by Mei, Chan and Liu (2014) is extended to examine the cases where the vegetated area has a finite extent. A mathematical model for small-amplitude periodic waves propagating through a lattice-like array of vertical cylinders within a finite region is developed. Assuming periodic lattice configuration and...

article

Edge waves generated by atmospheric pressure disturbances moving along a shoreline on a sloping beach

Seung-Nam Seo, Philip L.-F. Liu

Coastal Engineering > 2014 > 85 > Complete > 43-59

Edge waves generated by moving atmospheric disturbances parallel to the shoreline are investigated. Following a standard transformation method, an analytical expression of the surface elevation is derived, which consists of an infinite number of modes. Each mode is expressed as the sum of three singular integrals. Using the contour integration method, these singular integrals are converted to regular...

article

Waves of intermediate length through an array of vertical cylinders

Chiang C. Mei, I. -Chi Chan, Philip L. -F. Liu

Environmental Fluid Mechanics > 2014 > 14 > 1 > 235-261

We report a semi-analytical theory of wave propagation through a vegetated water. Our aim is to construct a mathematical model for waves propagating through a lattice-like array of vertical cylinders, where the macro-scale variation of waves is derived from the dynamics in the micro-scale cells. Assuming infinitesimal waves, periodic lattice configuration, and strong contrast between the lattice spacing...

article

Direct measurements of local bed shear stress in the presence of pressure gradients

Nimish Pujara, Philip L.-F. Liu

Experiments in Fluids > 2014 > 55 > 7 > 1-13

This paper describes the development of a shear plate sensor capable of directly measuring the local mean bed shear stress in small-scale and large-scale laboratory flumes. The sensor is capable of measuring bed shear stress in the range $$\pm$$ ± 200 Pa with an accuracy up to $$\pm$$ ± 1 %. Its size, 43 mm in the flow direction, is designed to be small enough to give spatially local...

article

Plunging solitary wave and its interaction with a slender cylinder on a sloping beach

Weihua Mo, Atle Jensen, Philip L.-F. Liu

Ocean Engineering > 2013 > 74 > Complete > 48-60

Laboratory experiments were performed for solitary waves breaking on a constant slope. In the second set of experiments a vertical cylinder was installed on the slope, which was subject to the impact of a shoaling solitary wave. PIV was used to record the time history of free surface elevations, and temporal and spatial velocity variations in two fields of view (FOVs). A numerical model was also employed...

article

On the run-up and back-wash processes of single and double solitary waves — An experimental study

Hong-Yueh Lo, Yong Sung Park, Philip L.-F. Liu

Coastal Engineering > 2013 > 80 > Complete > 1-14

The run-up and back-wash processes of single and double solitary waves on a slope were studied experimentally. Experiments were conducted in three different wave flumes with four different slopes. For single solitary wave, new experimental data were acquired and, based on the theoretical breaking criterion, a new surf parameter specifically for breaking solitary waves was proposed. An equation to...

article

Edge waves generated by the landslide on a sloping beach

Seung-Nam Seo, Philip L.-F. Liu

Coastal Engineering > 2013 > 73 > Complete > 133-150

A general solution of linear edge wave, expressed in triple integral form, is obtained for a landslide of an arbitrary shape on a uniformly sloping beach. Utilizing a reliable numerical integration package, surface elevations are computed accurately. Results for various Gaussian landslide shapes are presented by both numerical integrations and an asymptotic method along with numerical integration...

article

Predictions of vertical sediment flux in oscillatory flows using a two-phase, sheet-flow model

Xiao Yu, Tian-Jian Hsu, James T. Jenkins, Philip L.-F. Liu

Advances in Water Resources > 2012 > 48 > Complete > 2-17

A two-phase sheet flow model is utilized to investigate the wave-induced vertical sediment flux in the benthic boundary layer. The near-bed vertical sediment flux is a critical parameterization for suspended load models. In this paper, we show that the vertical sediment fluxes predicted by the two-phase model agree with the U-tube data for oscillatory flows. Both the measured data and model results...

article

Large-scale edge waves generated by a moving atmospheric pressure

Chao An, Philip L-F. Liu, Seung Nam Seo

Theoretical and Applied Mechanics Letters > 2012 > 2 > 4

Long waves generated by a moving atmospheric pressure distribution, associated with a storm, in coastal region are investigated numerically. For simplicity the moving atmospheric pressure is assumed to be moving only in the alongshore direction and the beach slope is assumed to be a constant in the on-offshore direction. By solving the linear shallow water equations we obtain numerical solutions for...

article

Insights on the 2009 South Pacific tsunami in Samoa and Tonga from field surveys and numerical simulations

Hermann M. Fritz, Jose C. Borrero, Costas E. Synolakis, Emile A. Okal, more

Earth-Science Reviews > 2011 > 107 > 1-2 > 66-75

An M _w ≈8.1 earthquake south of the Samoan Islands on 29 September 2009 generated a tsunami that killed 189 people. From 4 to 11 October, an International Tsunami Survey Team surveyed the seven major islands of the Samoan archipelago. The team measured locally focused runup heights of 17m at Poloa and inundation of more than 500m at Pago Pago. A follow-up expedition from 23 to 28 November...

article

An explicit finite difference model for simulating weakly nonlinear and weakly dispersive waves over slowly varying water depth

Xiaoming Wang, Philip L.-F. Liu

Coastal Engineering > 2011 > 58 > 2 > 173-183

In this paper, a modified leap-frog finite difference (FD) scheme is developed to solve Non linear Shallow Water Equations (NSWE). By adjusting the FD mesh system and modifying the leap-frog algorithm, numerical dispersion is manipulated to mimic physical frequency dispersion for water wave propagation. The resulting numerical scheme is suitable for weakly nonlinear and weakly dispersive waves propagating...

article

An integrated model of wave-seabed-structure interactions

Ji-sheng Zhang, Bo Wang, Dong-sheng Jeng, Philip L. -F. Liu, more

Journal of Hydrodynamics, Ser. B > 2010 > 22 > 5(S1) > 126-131

The phenomenon of wave-seabed-structure interactions have occurred in the marine environment with a coastal permeable (or partially permeable) structure, which has attracted great attention from coastal engineers involved in the design of marine structures. In this study, a porous seabed model based on Biot's consolidation equation and pore-elastic theory is integrated into the COBRAS wave-structure...

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Search results for: Philip L.-F. Liu

A unified coupled-mode method for wave scattering by rectangular-shaped objects

Modeling transient long waves propagating through a heterogeneous coastal forest of arbitrary shape

Periodic water waves through a heterogeneous coastal forest of arbitrary shape

Analytical solutions for estimating tsunami propagation speeds

An integral treatment of friction during a swash uprush

Estimating tsunami runup with fault plane parameters

An experimental study of the interaction of two successive solitary waves in the swash: A strongly interacting case and a weakly interacting case

Development of a tsunami early warning system for the South China Sea

Periodic water waves through an aquatic forest

Edge waves generated by atmospheric pressure disturbances moving along a shoreline on a sloping beach

Waves of intermediate length through an array of vertical cylinders

Direct measurements of local bed shear stress in the presence of pressure gradients

Plunging solitary wave and its interaction with a slender cylinder on a sloping beach

On the run-up and back-wash processes of single and double solitary waves — An experimental study

Edge waves generated by the landslide on a sloping beach

Predictions of vertical sediment flux in oscillatory flows using a two-phase, sheet-flow model

Large-scale edge waves generated by a moving atmospheric pressure

Insights on the 2009 South Pacific tsunami in Samoa and Tonga from field surveys and numerical simulations

An explicit finite difference model for simulating weakly nonlinear and weakly dispersive waves over slowly varying water depth

An integrated model of wave-seabed-structure interactions

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