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Dr. Huabin Shi
Faculty of Science and Technology, Department of Civil and Environmental Engineering, University of Macau, Avenida da Universidade, Taipa, Macao, China

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Research Keywords & Expertise

0 Sediment Transport
0 coastal hazards
0 Granular flows
0 Meshless computational fluid dynamics
0 Storm surge and typhoon

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Jfm papers
Published: 20 April 2021 in Journal of Fluid Mechanics
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Shear dilatation/contraction of granular materials has long been recognized as an important process in granular flows but a comprehensive theoretical description of this process for a wide range of shear rates is not yet available. In this paper, a theoretical formulation of dilatation/contraction is proposed for continuum modelling of granular flows, in which the dilatation/contraction effects consist of a frictional component, which results from the rearrangement of enduring-contact force chains among particles, and a collisional component, which arises from inter-grain collisions. In this formulation, a frictional solid pressure, which considers the rearrangement of contact force chains under shear deformation, is proposed for the frictional dilatation/contraction, while well-established rheological laws are adopted for the collisional inter-grain pressure to account for the collisional dilatancy effect. The proposed formulation is first verified analytically by describing the shear-weakening behaviour of granular samples in a torsional shear rheometer and by capturing the incipient failure of both dry and immersed granular slopes. The proposed dilatation/contraction formulation is then further validated numerically by integrating it into a two-fluid continuum model and applying the model to study the collapse of submerged granular columns, in which the dilatation/contraction plays a critical role.

ACS Style

Huabin Shi; Ping Dong; Xiping Yu; Yan Zhou. A theoretical formulation of dilatation/contraction for continuum modelling of granular flows. Journal of Fluid Mechanics 2021, 916, 1 .

AMA Style

Huabin Shi, Ping Dong, Xiping Yu, Yan Zhou. A theoretical formulation of dilatation/contraction for continuum modelling of granular flows. Journal of Fluid Mechanics. 2021; 916 ():1.

Chicago/Turabian Style

Huabin Shi; Ping Dong; Xiping Yu; Yan Zhou. 2021. "A theoretical formulation of dilatation/contraction for continuum modelling of granular flows." Journal of Fluid Mechanics 916, no. : 1.

Journal article
Published: 11 March 2021 in Remote Sensing
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The accuracy of the rain distribution could be enhanced by assimilating the remotely sensed and gauge-based precipitation data. In this study, a new nonparametric general regression (NGR) framework was proposed to assimilate satellite- and gauge-based rainfall data over southeast China (SEC). The assimilated rainfall data in Meiyu and Typhoon seasons, in different months, as well as during rainfall events with various rainfall intensities were evaluated to assess the performance of this proposed framework. In rainy season (Meiyu and Typhoon seasons), the proposed method obtained the estimates with smaller total absolute deviations than those of the other satellite products (i.e., 3B42RT and 3B42V7). In general, the NGR framework outperformed the original satellites generally on root-mean-square error (RMSE) and mean absolute error (MAE), especially on Nash-Sutcliffe coefficient of efficiency (NSE). At monthly scale, the performance of assimilated data by NGR was better than those of satellite-based products in most months, by exhibiting larger correlation coefficients (CC) in 6 months, smaller RMSE and MAE in at least 9 months and larger NSE in 9 months, respectively. Moreover, the estimates from NGR have been proven to perform better than the two satellite-based products with respect to the simulation of the gauge observations under different rainfall scenarios (i.e., light rain, moderate rain and heavy rain).

ACS Style

Yuanyuan Zhou; Nianxiu Qin; Qiuhong Tang; Huabin Shi; Liang Gao. Assimilation of Multi-Source Precipitation Data over Southeast China Using a Nonparametric Framework. Remote Sensing 2021, 13, 1057 .

AMA Style

Yuanyuan Zhou, Nianxiu Qin, Qiuhong Tang, Huabin Shi, Liang Gao. Assimilation of Multi-Source Precipitation Data over Southeast China Using a Nonparametric Framework. Remote Sensing. 2021; 13 (6):1057.

Chicago/Turabian Style

Yuanyuan Zhou; Nianxiu Qin; Qiuhong Tang; Huabin Shi; Liang Gao. 2021. "Assimilation of Multi-Source Precipitation Data over Southeast China Using a Nonparametric Framework." Remote Sensing 13, no. 6: 1057.

Journal article
Published: 16 May 2019 in Advances in Water Resources
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Massive sediment motion in water with a free surface is an important kind of geophysical flows such as hyper-concentrated sediment laden river flows discharging into estuarine delta and turbidity currents generated by subaqueous landslides. One of the key and common characteristics of such flows is that interactions between water and sediment as well as those among sediment particles are equally important in affecting the sediment motion and the fluid flow. This paper presents a numerical model that builds on and extends an earlier two-phase SPH model based on a continuum formulation of solid-liquid mixtures [Comput. Phys. Commun. 221 (2017) 259] to provide a unified description of massive sediment motion in free surface flows. In the model, a constitutive law based on the rheology of dense granular flow is introduced to express the intergranular stresses while the interphase drag force is determined by combining the Ergun equation for dense solid-fluid mixtures and the power law for dilute suspensions. The proposed model is firstly applied to the study of collapse of loosely or densely packed granular columns submerged in water. The computed surface profiles of the granular column are found to be in good agreement with the experimental data. It shows that the loosely packed and the densely packed columns behave rather differently due to the differences in water-sediment interaction processes. The model is then used to simulate a dam-break flow over a mobile sediment bed. The computed configurations of the flow and the movable bed also agree well with the measured data. The predicted position on the leading edge of the flow has a mean error of 0.8% while the mean error for the maximum bed height is 12.9%. To further identify the dynamic processes involved, effects of water-sediment interactions on the motion of bed materials are investigated by examining the spatial and temporal variations of pressure and flow velocity. As shown in the applications, the proposed two-phase SPH model can successfully represent both the gravity-driven underwater granular flows and the shear flow driven intense sediment transport, implying its potential use in practical scenarios in which the two kinds of flows exist simultaneously, such as landslides triggered by storm in shallow sea and flows resulted in barrier or dam breaks.

ACS Style

Huabin Shi; Pengfei Si; Ping Dong; Xiping Yu. A two-phase SPH model for massive sediment motion in free surface flows. Advances in Water Resources 2019, 129, 80 -98.

AMA Style

Huabin Shi, Pengfei Si, Ping Dong, Xiping Yu. A two-phase SPH model for massive sediment motion in free surface flows. Advances in Water Resources. 2019; 129 ():80-98.

Chicago/Turabian Style

Huabin Shi; Pengfei Si; Ping Dong; Xiping Yu. 2019. "A two-phase SPH model for massive sediment motion in free surface flows." Advances in Water Resources 129, no. : 80-98.

Journal article
Published: 13 September 2018 in Coastal Engineering
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Surface water waves generated by large-scale landslides have been a major concern of many geoscientists and coastal engineers because they may result in disastrous consequences. This study presents an advanced two-phase model for dry granular material intruding into an otherwise still water body as well as their resulting waves. The water-air interface both within and outside the granular material is captured by the volume of fluid method. The inter-granular stresses are formulated based on a general collisional-frictional law developed for underwater granular flows and a modified k−ε model is adopted to describe the turbulence effect of the ambient fluid. Phase interaction is characterized by the drag force caused by the relative motion between the granular particles and the fluid. The effect of the ambient fluid on the restitution coefficient of granular particles is also considered. The newly proposed two-phase model is validated following a reasonable agreement of the numerical results with measured data from small-scale laboratory tests on surface waves caused by collapse of a subaerial granular column and by intrusion of a landslide into water. Generation and propagation of the waves, as well as the motion and deformation of the granular body, are all adequately represented by the numerical model. A relatively more general applicability of the proposed model to the study of waves generated by granular landslides can thus be expected.

ACS Style

Pengfei Si; Huabin Shi; Xiping Yu. A general numerical model for surface waves generated by granular material intruding into a water body. Coastal Engineering 2018, 142, 42 -51.

AMA Style

Pengfei Si, Huabin Shi, Xiping Yu. A general numerical model for surface waves generated by granular material intruding into a water body. Coastal Engineering. 2018; 142 ():42-51.

Chicago/Turabian Style

Pengfei Si; Huabin Shi; Xiping Yu. 2018. "A general numerical model for surface waves generated by granular material intruding into a water body." Coastal Engineering 142, no. : 42-51.

Journal article
Published: 07 August 2018 in Physics of Fluids
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ACS Style

Pengfei Si; Huabin Shi; Xiping Yu. Development of a mathematical model for submarine granular flows. Physics of Fluids 2018, 30, 083302 .

AMA Style

Pengfei Si, Huabin Shi, Xiping Yu. Development of a mathematical model for submarine granular flows. Physics of Fluids. 2018; 30 (8):083302.

Chicago/Turabian Style

Pengfei Si; Huabin Shi; Xiping Yu. 2018. "Development of a mathematical model for submarine granular flows." Physics of Fluids 30, no. 8: 083302.

Journal article
Published: 01 December 2017 in Computer Physics Communications
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ACS Style

Huabin Shi; Xiping Yu; Robert A. Dalrymple. Development of a two-phase SPH model for sediment laden flows. Computer Physics Communications 2017, 221, 259 -272.

AMA Style

Huabin Shi, Xiping Yu, Robert A. Dalrymple. Development of a two-phase SPH model for sediment laden flows. Computer Physics Communications. 2017; 221 ():259-272.

Chicago/Turabian Style

Huabin Shi; Xiping Yu; Robert A. Dalrymple. 2017. "Development of a two-phase SPH model for sediment laden flows." Computer Physics Communications 221, no. : 259-272.

Journal article
Published: 01 August 2015 in International Journal of Sediment Research
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An Euler–Lagrange two-phase flow model is developed to study suspended sediment transport by open-channel flows with an Eddy Interaction Model (EIM) applied to consider the effect of fluid turbulence on sediment diffusion. For the continuous phase, the mean fluid velocity, the turbulent kinetic energy and its dissipation rate are directly estimated by well-established empirical formulas. For the dispersed phase, sediment particles are tracked by solving the equation of motion. The EIM is applied to compute the particle fluctuation velocity. Neglecting the effect of particles on flow turbulence as usually suggested for dilute cases in the literature, the Euler–Lagrange model is applied to simulate suspended sediment transport in open channels. Although the numerical results agree well with those by the well-known random walk particle tracking model (RWM) and with the laboratory data for fine sediment cases, it is clearly shown that such an Euler–Lagrange model underestimates the sediment concentration for the medium-sized and coarse sediment cases. To improve the model, a formula is proposed to consider the local fluid turbulence enhancement around a particle due to vortex shedding in the wake. Numerical results of the modified model then agree very well with laboratory data for not only the fine but also the coarse sediment cases.

ACS Style

Huabin Shi; Xiping Yu. An effective Euler–Lagrange model for suspended sediment transport by open channel flows. International Journal of Sediment Research 2015, 30, 361 -370.

AMA Style

Huabin Shi, Xiping Yu. An effective Euler–Lagrange model for suspended sediment transport by open channel flows. International Journal of Sediment Research. 2015; 30 (4):361-370.

Chicago/Turabian Style

Huabin Shi; Xiping Yu. 2015. "An effective Euler–Lagrange model for suspended sediment transport by open channel flows." International Journal of Sediment Research 30, no. 4: 361-370.

Journal article
Published: 01 November 2013 in Journal of Environmental Management
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A numerical model based on the random walk particle tracking technique is developed to simulate the transport of the contaminants discharged into the coastal area of Guangxi, China from rivers. The model couples a 1D river flow module and a 2D coastal circulation module. Two transport timescales, i.e., the age and the arrival time, are introduced to characterize the contaminant transport process. The age is the time for a particle taken to enter the domain of interest after it left the place where the age is initially set to zero. The arrival time, on the other hand, is the age of the particle arriving at a particular place most quickly after release. It is useful for emergency responses to such an accident as toxic substance leakage. By the numerical model, the age and the arrival time under various conditions in the coastal area of Guangxi, China are studied in details. The age distribution and the arrival time of particles at a specific location are shown to closely rely on the coastal hydrodynamic environment in addition to the distance of the location from the source where particles are released. Particles released at spring tide and at ebb tide are found to spread more quickly than those released at neap tide and at flood tide, respectively. A large carrying discharge of river reduces the ages of the contaminants from the river concerned when transported to a place within the coastal area, while it has less influence on the arrival time, particularly in a place along the coast.

ACS Style

Huabin Shi; Xiping Yu. Application of transport timescales to coastal environmental assessment: A case study. Journal of Environmental Management 2013, 130, 176 -184.

AMA Style

Huabin Shi, Xiping Yu. Application of transport timescales to coastal environmental assessment: A case study. Journal of Environmental Management. 2013; 130 ():176-184.

Chicago/Turabian Style

Huabin Shi; Xiping Yu. 2013. "Application of transport timescales to coastal environmental assessment: A case study." Journal of Environmental Management 130, no. : 176-184.