©2019 by Clarence Choi.

Externally funded projects:

Principal Investigator

2016 – ongoing: Smart landslide information system, The Hong Kong Jockey Club Disaster Preparedness and Response Institute (HKJCDPRI); Project No: HKJCDPRI17

2016 – ongoing: Submersible model to study submarine debris flow impact on deep sea structures, Research Grants Council (RGC) of Hong Kong; Project No: IGN15EG03

2018 – ongoing: Mechanisms of interaction between debris flow and baffles, General Research Fund (GRF) of the RGC of Hong Kong; Project No.: 16209717

2018 – ongoing: Multi-scale modelling strategies for debris-flow; a new technique for hazard assessment combining numerical modelling and physical experiments, Politecnico Di Torino, Italy: Joint research projects with top universities 

2018 – ongoing: Smart landslide barriers, HKJCDPRI; Project No.: HKJCDPRI18 

2019 – ongoing: Impact of geophysical flows on rigid barriers with and without cushioning materials, GRF of RGC Hong Kong; Project No.: 16212618

2018 – ongoing: Interaction mechanisms between debris flows and multiple barriers, The National Natural Science Foundation (NSFC) of China; Project No.:  5170091039

2020 – 2023: Impact mechanisms of debris flows on erodible bed against multiple flexible barriers: large-scale physical modelling, GRF of RGC Hong Kong;  Project No.: 16210219

2019 – 2020: 3D numerical modelling of the effects of horizontal orientation of soil nails for slope stabilisation, Industry funded project (CM Wong and Associated Ltd.)

Co-Investigator

2019 – 2026: Centre for slope safety, Areas of Excellence (AoE) of RGC Hong Kong; Project No.: AoE/E-603/18

​2019 – 2021: Modelling entrainment, inter-phase mass exchange and surge dynamics of debris flows and their interaction with flexible barriers, GRF of RGC Hong Kong; Project No.: 16205418


2020 – 2026: Research on the resilient mitigation countermeasures against debris flows, The Belt and Road research team of CAS

 

ONGOING PROJECTS

 

LARGE-NONLINEAR DEFORMATION FINITE ELEMENT MODELLING OF FLOW-STRUCTURE INTERACTION

A 3D coupled large-deformation finite element model has been benchamrked against several well-documented physical flows. The model uses an Arbitrary Lagrangian-Eulerian formulation, which discretises the computational domain into a mesh of elements. Elements are allowed to move arbitrarily and the shape of the elements are optimised, enabling large deformation of the debris flow. This model enables the interaction between the debris flow and flexible barriers to be modelled using finite-element contacts.

LARGE-SCALE PENDULUM IMPACT TESTS

A site was setup to investigate the dynamics response of baffles subjected to boulder impact. Impact energies of up to 100 kJ were modelled. Findings can directly be used to optimise the design of baffles and straining structures.

SUBMARINE DEBRIS FLOWS

A bench top physical model set up to investigate the flow dynamics of submarine debris flows. Submarine debris flows are known to travel long distances and are several orders in volume greater than subaerial debris flows.

28-M LONG FLUME TEST AT HKU KADOORIE CENTRE

This video shows a typical flume experiment of a debris flow impacting a flexible barrier. More details to come..

SINGLE PHASE FLOW IMPACTING PERVIOUS AND DEFORMABLE BARRIER: MATERIAL POINT METHOD

To back-analyse physical model tests looking at flow-structure interaction, a single phase Material Point Method (MPM) has been developed. More complex constitutive behaviour will be incorporated in the future, including shear rate dependent rheology and softening.

EVENT-DRIVEN SMART SENSOR

A collaborative project was funded by the The Hong Kong Jockey Club Disaster Preparedness and Response Institute (HKJCDPRI) to evaluate a smart-landslide impact detection system. The event-driven sensor does not require power and is triggered mechanically. This device sends a signal to an IT platform to notify engineers when barriers are impacted.