scholarly journals EFFECTS OF HORIZONTAL NON-HOMOGENEOUS SOIL PROPERTY ON LOCAL WAVE-INDUCED SOIL RESPONSE

2014 ◽  
Vol 1 (34) ◽  
pp. 36
Author(s):  
Jinhai Zheng ◽  
Titi Sui ◽  
Chi Zhang ◽  
Yakun Guo
Keyword(s):  
Soil Property ◽  
Soil Response ◽  
Local Wave ◽  
Homogeneous Soil ◽  
Wave Induced

Numerical Study of Standing Wave-Induced Seabed Residual Response with the Non-homogeneous Soil Property

2018 ◽  
Vol 85 ◽  
pp. 921-925
Author(s):  
Titi Sui ◽  
Chi Zhang ◽  
Jinhai Zheng ◽  
Yakun Guo ◽  
Mingxiao Xie
Keyword(s):  
Standing Wave ◽  
Soil Property ◽  
Numerical Study ◽  
Homogeneous Soil ◽  
Residual Response ◽  
Wave Induced

scholarly journals The effects of slab geometries and wave directions on the steep wave-induced soil response and liquefaction around gravity-based offshore foundations

2019 ◽  
Vol 15 (8) ◽  
pp. 866-877
Author(s):  
Yuzhu Li ◽  
Muk Chen Ong ◽  
Ove Tobias Gudmestad ◽  
Bjørn Helge Hjertager
Keyword(s):  
Soil Response ◽  
Wave Induced ◽  
Steep Wave

NUMERICAL MODELLING OF WAVE-INDUCED SOIL RESPONSE AROUND BREAKWATER HEADS

2011 ◽  
pp. 789-796
Author(s):  
D.-S. JENG ◽  
Y. ZHANG ◽  
J.-S. ZHANG ◽  
C. ZHANG ◽  
P. L.-F. LIU
Keyword(s):  
Numerical Modelling ◽  
Soil Response ◽  
Wave Induced

Stability of finite-amplitude interfacial waves. Part 2. Numerical results

1985 ◽  
Vol 160 ◽  
pp. 317-336 ◽  
Author(s):  
D. I. Pullin ◽  
R. H. J. Grimshaw
Keyword(s):  
Lower Layer ◽  
Modulational Instability ◽  
Preceding Paper ◽  
Boussinesq Approximation ◽  
Finite Amplitude ◽  
Numerical Results ◽  
Linearized Stability ◽  
Local Wave ◽  
Truncated Fourier Series ◽  
Wave Induced

In the preceding paper (Grimshaw & Pullin 1985) we discussed the long-wavelength modulational instability of interfacial progressive waves in a two-layer fluid. In this paper we complement our analytical results by numerical results for the linearized stability of finite-amplitude waves. We restrict attention to the case when the lower layer is infinitely deep, and use the Boussinesq approximation. For this case the basic wave profile has been calculated by Pullin & Grimshaw (1983a, b). The linearized stability problem for perturbations to the basic wave is solved numerically by seeking solutions in the form of truncated Fourier series, and solving the resulting eigenvalue problem for the growth rate as a function of the perturbation wavenumber. For small or moderate basic wave amplitudes we show that the instabilities are determined by a set of low-order resonances. The lowest resonance, which contains the modulational instability, is found to be dominant for all cases considered. For higher wave amplitudes, the resonance instabilities are swamped by a local wave-induced Kelvin–Helmholtz instability.

scholarly journals ADCP Bias and Stokes Drift in AUV-Based Velocity Measurements

2017 ◽  
Vol 34 (9) ◽  
pp. 2029-2042 ◽  
Author(s):  
André Amador ◽  
Sergio Jaramillo ◽  
Geno Pawlak
Keyword(s):  
Wave Field ◽  
Field Experiments ◽  
Autonomous Underwater Vehicle ◽  
Stokes Drift ◽  
Linear Wave ◽  
Velocity Measurements ◽  
Adcp Measurements ◽  
Local Wave ◽  
Induced Velocity ◽  
Wave Induced

AbstractA theoretical model is developed to describe how autonomous underwater vehicle (AUV)-based current measurements are influenced by a surface wave field. The model quantifies a quasi-Lagrangian, wave-induced velocity bias as a function of the local wave conditions, and the vehicle’s depth and velocity using a first-order expansion of the linear wave solution. The theoretical bias is verified via field experiments carried out off the coast of Oahu, Hawaii. Spatially averaged along- and cross-track AUV velocity measurements are calculated over one effective wavelength and compared with time-averaged, fixed ADCP measurements in a range of wave and current conditions. The wave-induced bias is calculated using wave directional spectra derived from fixed ADCP data. Ensemble-averaged velocity differences confirm the presence of the wave-induced bias O(1–5) cm s−1 and reveal an additional bias in the direction of the vehicle motion O(1) cm s−1. The analysis considers velocity measurements made using a Remote Environmental Monitoring Units (REMUS) 100 AUV, but the content applies to any small AUV (vehicle size wavelength) immersed in a wave field.

scholarly journals Effects of the Soil Property Distribution Gradient on the Wave-Induced Response of a Non-Homogeneous Seabed

2019 ◽  
Vol 7 (8) ◽  
pp. 281 ◽  
Author(s):  
Titi Sui ◽  
Yu Jin ◽  
Zhaojun Wang ◽  
Chi Zhang ◽  
Jian Shi
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Soil Properties ◽  
Pore Pressure ◽  
Soil Property ◽  
Induced Response ◽  
Property Distribution ◽  
Effective Stresses ◽  
Soil Distribution ◽  
Wave Induced

The seabed is usually non-homogeneous in the real marine environment, and its response to the dynamic wave loading is of great concern to coastal engineers. Previous studies on the simulation of a non-homogeneous seabed response have mostly adopted a vertically layered seabed, in which homogeneous soil properties are assumed in the governing equations for one specified layer. This neglects the distribution gradient terms of soil property, thus leading to an inaccurate evaluation of the dynamic response of a non-homogeneous seabed. In this study, a numerical model for a wave-induced 3D non-homogeneous seabed response is developed, and the effects of the soil property distribution gradient on the wave-induced response of a non-homogeneous seabed are numerically investigated. The numerical model is validated, and the results of the present simulation agree well with those of previous studies. The validated model is applied to simulate an ideal two-dimensional (2D) vertical non-homogeneous seabed. The model is further applied to model the practical wave-induced dynamic response of a three-dimensional (3D) non-homogeneous seabed around a mono-pile. The difference in pore pressure and soil effective stresses due to the soil distribution gradient is investigated. The effects of the soil distribution gradient on liquefaction are also examined. Results of this numerical study indicate that (1) pore pressure decreases while soil effective stresses increase (the maximum difference of the effective stresses can reach 68.9 % p 0 ) with a non-homogeneous seabed if the distribution gradient terms of soil properties are neglected; (2) the effect of the soil property distribution gradient terms on the pore pressure becomes more significant at the upper seabed, while this effect on the soil effective stresses is enhanced at the lower seabed; (3) the effect of the soil distribution gradient on the seabed response is greatly affected by the wave reflection and diffraction around the pile foundation; and (4) the soil distribution gradient terms can be neglected in the evaluation of seabed liquefaction depth in engineering practice.

scholarly journals DYNAMIC RESIDUAL SEABED RESPONSE AROUND A MOVABLE PILE FOUNDATION

2018 ◽  
pp. 20
Author(s):  
Titi Sui ◽  
Chi Zhang ◽  
Jinhai Zheng ◽  
Dong-Sheng Jeng
Keyword(s):  
Pile Foundation ◽  
Wave Model ◽  
Residual Soil ◽  
Governing Equations ◽  
Soil Response ◽  
Oscillatory Mechanism ◽  
Soil Skeleton ◽  
Inertial Terms ◽  
Residual Response ◽  
Wave Induced

Wave-induced seabed soil response and its resultant liquefaction is common observed in a silt seabed with relative poor drainage condition, which poses a great threaten to the foundation safety of marine structures. Regarding the governing equations, three different approaches namely the Fully-dynamic (FD), Partialdynamic (PD) and Quasi-static (QS) model, have been used in the previous studies. Among these, both PD and FD approaches consider the effect of the inertial terms of soil skeleton/fluid. It has been reported in the literature that effects of the inertial terms on the seabed response could not be neglected, especially for the seabed around a movable structure (Ulker et al., 2010). However, these studies only focused on the oscillatory mechanism which are probably seen in a sandy seabed with high permeability. Recently, Zhao et al. (2017) investigated the residual soil response around a pile foundation by integrating a RANS wave model and a QS seabed model. In their study, the inertial terms of soil skeleton and pore water were neglected. To the authors’ best knowledge, up to now, effects of the inertial terms on the residual response of a silt seabed have not been investigated.

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