A5041433601- earthquake and tectonic studies
- Coastal and Marine Dynamics
- Earthquake and Tsunami Effects
- Hydrology and Sediment Transport Processes
- Tropical and Extratropical Cyclones Research
- Methane Hydrates and Related Phenomena
- Hydraulic flow and structures
- Ocean Waves and Remote Sensing
- Geological formations and processes
- Oceanographic and Atmospheric Processes
- Soil erosion and sediment transport
- Combustion and Detonation Processes
- Aeolian processes and effects
- Wave and Wind Energy Systems
- Fluid Dynamics and Vibration Analysis
- Coastal wetland ecosystem dynamics
- Water Systems and Optimization
- Seismology and Earthquake Studies
- Fish Ecology and Management Studies
- Earthquake Detection and Analysis
- Flood Risk Assessment and Management
- Microplastics and Plastic Pollution
- Fluid Dynamics Simulations and Interactions
- Granular flow and fluidized beds
- Landslides and related hazards
University of Auckland
2016-2025
National Institute of Water and Atmospheric Research
2022
GNS Science
2022
University of Oxford
2017
University of Plymouth
2015-2017
Schlumberger (British Virgin Islands)
2011
Weyerhaeuser (United States)
1987
Abstract Mixing processes downstream of river confluences impacts the ecology and related environmental management networks. A clear understanding such is challenging, especially for having width‐to‐depth ratios larger than 100, due to limited available field data. In this study, four surveys based on hydro‐acoustic conductivity measurements were conducted near confluence between Yangtze River Poyang Lake, which are largest freshwater lake in China, respectively. It was found that mixing...
The ability of the NewWave focused wave group (the scaled auto-correlation function) to represent average shape in time large waves a random sea state makes it useful tool for design offshore structures. However, profile has only been validated against field data on deep and intermediate water depths. A similar validation is advisable when applying shallow problems, where are less dispersive more nonlinear. For this purpose, recorded by two Channel Coastal Observatory (CCO) buoys during...
Abstract. The process of shoreline change is inherently complex, and reliable predictions position remain a key challenge in coastal research. Predicting evolution could potentially benefit from deep learning (DL), which recently developed widely successful data-driven methodology. However, so far its implementation for time series data has been limited. aim this contribution to investigate the potential DL algorithms predict interannual derived camera system observations at New Zealand...
This paper presents an experimental study of local scour at submerged weirs with different downstream slopes. Thirty-three tests coarse sand (d50=0.85 mm) and 24 fine (d50=0.26 were carried out in a sand-recirculating flume. The for each type used four weir slopes (π/6, π/4, π/3, π/2 to horizontal the sand; π/12, π/6, sand). results show that upstream depth is independent slope β. For both types, has no effect on when it greater than hole θ. β<θ, surface partly exposed flow, resulting dw,...
This study introduced a new riprap placement design for the purpose of reducing bridge pier scour. The consisted embedding layer around pier, flush with surrounding bed, depression to help guide horseshoe vortex. countermeasure was tested among other conventional designs in clear-water flow conditions and transition-flow conditions. condition is evolution period from clear water live bed where has yet reach an equilibrium state. found reduce greatly depth volume scour both conditions, up...
The variability of the largest wave impacts, where nominally identical waves produce significantly different pressures, is widely known. However, mechanisms are not well understood. Here we provide a review and investigation factors affecting impact pressures on steep walls, quantifying range parameters that have been used in literature. We then present two investigations: (i) Setup 1 effect structure slope (ii) 2 effects kinematics pressure variability. Firstly, impacts arising from about...
Abstract Fallen trees enter the adjacent stream and are carried away downstream by current. As joins another one, complex hydrodynamics near their confluence make movement of wood hard to predict. These woods may accumulate resulting in backwater subsequent potential flooding. A laboratory study was conducted investigate accumulation behavior individual pieces confluence. The characteristics (i.e., length, diameter, density) hydraulic conditions discharge ratio release distance) were varied...
Abstract River confluences with a compound‐channel tributary are common in large river networks, for example, the Yangtze basin and Amazon basin. They affect confluence hydrodynamics, nutrient depletion fish migration network, due to seasonal exposure submergence of floodplain. The corresponding influencing mechanisms critical but poorly understood. This study investigated hydrodynamic response channel flow floodplain, that is, various widths heights Two kinds secondary circulations were...
Owing to the interplay between forward Stokes drift and backward wave-induced Eulerian return flow, Lagrangian particles underneath surface gravity wave groups can follow different trajectories depending on their initial depth below surface. The motion of near free is dominated by waves drift, whereas at large depths horseshoe-shaped flow. For unidirectional groups, a small net displacement in direction travel group results surface, accompanied particle opposite depth. deep-water waves, we...
Abstract
Abstract. Theoretical source models of underwater explosions are often applied in studying tsunami hazards associated with subaqueous volcanism; however, their use numerical codes based on the shallow water equations can neglect significant dispersion generated wavefield. A non-hydrostatic multilayer method is validated against a laboratory-scale experiment wave generation from instantaneous disturbances and at field-scale Mono Lake, California, utilising relevant theoretical models. The...
We present a weakly nonlinear theory for the evolution of dispersive transient waves generated by moving seabed deformation. Using perturbation expansion up to second order, we show that higher-order components affect mostly leading wave and region close deforming seabed. In particular, in regime has higher crests deeper troughs than known linear solution, while trough propagates together with exhibits pulsating behaviour larger depth. also validate analytical model experimental data obtain...
Abstract. This study presents a comprehensive nationwide tsunami inundation assessment of New Zealand. It utilises wave amplitude data from recent probabilistic hazard (covering seven return periods at the 50th and 84th percentiles) computationally efficient model. modelling approach enhances accuracy previous exposure assessments, which have been limited by inconsistent simplified techniques. produces maps for 14 along entire Zealand coastline. These integrated with land cover...
Total wave group overtopping and maximum horizontal force responses are investigated for an idealised seawall/dike on a plane beach subject to compact focused attack, using both laboratory numerical flumes.The interactions have very short durations such that extraneous reflections from the wavemaker arrive long after main interaction.These test facilitate use of large ensembles tests explore sensitivity variations in focus location, phase angle at focus, linear amplitude.The scope flume is...
Abstract This paper develops a tsunami inundation model, filling the current void between industry applied simplified methods (bathtub and attenuation) comprehensive numerical modeling. The proposed model utilizes two‐dimensional equations established on hydraulic principles (energy conservation friction loss) to produce finite‐difference, model. While sophistication of depth‐averaged modeling has not been entirely replicated, incorporation roughness gravitational effects (slope) through...
The modification and utilization of rivers in regions where small-bodied diadromous fish are prevalent has largely occurred without fully understanding the migration behaviour these species. As a result, existing in-stream structures often prevent or restrict migration. Current passage design guidance generally focuses on providing average hydrodynamic conditions within range known critical swimming velocities for target Considerable portions discharge capacity must be sacrificed to achieve...